[libc++][Modules] Group the private detail headers into larger modules

[iana]

Summary

It's not really in the spirit of clang modules to make a top level module for every single header. That's necessary for the public headers, but the private detail headers could be grouped into bigger modules as long as they remain acyclic. Make a Python script to do the grouping.

[iana]

Need to update this with changes from D144322

[iana]

Update with changes from D155116 and D144322

[iana]

@ldionne is concerned about the maintainability of this patch. The module generation script is admittedly complicated.

1. validate_exports needs to be updated if module naming conventions change.
2. write_libcxx_includes needs to be updated when the subdirectories and files that need to be ignored are updated.
3. build_include_tree needs to be updated when new C++ versions are added.
4. build_include_tree needs to be updated when new macros control what gets included. _LIBCPP_ENABLE_EXPERIMENTAL and _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY were found while debugging module cycles that the script created.

It's probably not obvious that you might need to edit internal_module_attributes.json.in from time to time as includes change and new private detail headers are added.

While I don't personally think that doing any of these is particularly difficult or onerous, I must admit they aren't obvious. If you don't know you have to do them, the errors are going to be fairly difficult to figure out. Several of them you won't realize you've forgotten them until some time later. e.g. you might not realize that you need to add c++26 until years down the road when the modules become cyclic on that version because the script never knew it needed to take that into consideration.

Nevertheless, I'm posting this review because 1) it produces a much nicer module map than can be done by hand, and 2) it might be necessary down the road if build performance suffers for having too many modules.

[iana]

Add a missing requires

[iana]

Pick up changes from D144322

[iana]

Pick up changes from D144322

[iana]

Rebase

[iana]

Remove some dead code from the generator script.

[iana]

Don't allocate a Header for every line from cxx -H, which is what was happening from the dict.setdefault call. Break that up into a get/test/set sequence.

[iana]

Rebase

[iana]

Rebase

[iana]

Rebase

[iana]

Rebase

[iana]

Rebase

[iana]

Update Contributing.rst

[iana]

Rebase

[iana]

Rebase

[iana]

Rebase

[iana]

Rebase

[iana]

Rebase, fix the documentation

[iana]

Really fix the documentation

[Mordante]

@iana is this patch still active or is it obsolete with the recent commits?

[iana]

Rebase, pick up changes from D156177 and D156508

[ldionne]

[Github PR transition cleanup]

I've said it before but I think this is too complicated and we don't have a clear picture of the benefits. I would prefer abandoning this patch, but if you really want to move forward with it, please provide compelling evidence of why this complexity is worth adding.

[iana]

In D155141#4631516, @ldionne wrote:

[Github PR transition cleanup]

I've said it before but I think this is too complicated and we don't have a clear picture of the benefits. I would prefer abandoning this patch, but if you really want to move forward with it, please provide compelling evidence of why this complexity is worth adding.

I still think this results in a better module map; module-per-header solves our requirements but just feels very inelegant. But I think I need to split out some of the variables into the json file like which standards to run and which macros go with which standards. And probably convert that into a Python file akin to header_info.py. I'm also maybe overestimating how often the module map needs to change, and maybe it could be a regular generated file instead. I'll abandon this for now, and if we end up needing it after llvm 17 ships, or I get a bit of time to work on it and I'm still bummed about all the work I put in on this, I'll try it for review on GitHub.

libcxx/docs/Contributing.rst

 
 - Do you have :ref:`tests <testing>` for every public class and/or function you're adding or modifying?
 - Did you update the synopsis of the relevant headers?
 - Did you update the relevant files to track implementation status (in ``docs/Status/``)?
 - Did you mark all functions and type declarations with the :ref:`proper visibility macro <visibility-macros>`?
 - Did you add all new named declarations to the ``std`` module?
 - If you added a header:
 
-  - Did you add it to ``include/module.modulemap.in``?
   - Did you add it to ``include/CMakeLists.txt``?
   - If it's a public header, did you update ``utils/libcxx/test/header_information.py``?
 
 - Did you add the relevant feature test macro(s) for your feature? Did you update the ``generate_feature_test_macro_components.py`` script with it?
 - Did you run the ``libcxx-generate-files`` target and verify its output?
 
 The review process
 ==================

libcxx/include/CMakeLists.txt

 
 foreach(feature LIBCXX_ENABLE_FILESYSTEM LIBCXX_ENABLE_LOCALIZATION LIBCXX_ENABLE_THREADS LIBCXX_ENABLE_WIDE_CHARACTERS)
   if (NOT ${${feature}})
     set(requires_${feature} "requires LIBCXX_CONFIGURED_WITHOUT_SUPPORT_FOR_THIS_HEADER")
   endif()
 endforeach()
 
 configure_file("__config_site.in" "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site" @ONLY)
-configure_file("module.modulemap.in" "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap" @ONLY)
 
-set(_all_includes "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site"
-                  "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap")
+set(_all_includes "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site")
 foreach(f ${files})
   set(src "${CMAKE_CURRENT_SOURCE_DIR}/${f}")
   set(dst "${LIBCXX_GENERATED_INCLUDE_DIR}/${f}")
   add_custom_command(OUTPUT ${dst}
     DEPENDS ${src}
     COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
     COMMENT "Copying CXX header ${f}")
   list(APPEND _all_includes "${dst}")
 endforeach()
 
+check_cxx_compiler_flag(-cxx-isystem CXX_SUPPORTS_CXX_ISYSTEM_FLAG)
+check_cxx_compiler_flag(-fshow-skipped-includes CXX_SUPPORTS_FSHOW_SKIPPED_INCLUDES_FLAG)
+if (CXX_SUPPORTS_CXX_ISYSTEM_FLAG AND CXX_SUPPORTS_FSHOW_SKIPPED_INCLUDES_FLAG AND CXX_SUPPORTS_NOSTDINCXX_FLAG)
+  set(LIBCXX_INTERMEDIATES_DIR "${LLVM_BINARY_DIR}/intermediates")
+  configure_file(module.modulemap.in "${LIBCXX_INTERMEDIATES_DIR}/module.modulemap" @ONLY)
+  configure_file(internal_module_attributes.json.in "${LIBCXX_INTERMEDIATES_DIR}/internal_module_attributes.json" @ONLY)
+
+  if (LIBCXX_GENERATED_INCLUDE_DIR STREQUAL LIBCXX_GENERATED_INCLUDE_TARGET_DIR)
+    set(libcxx_include_target_directory "")
+  else()
+    set(libcxx_include_target_directory --libcxx-include-target-directory "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}")
+  endif()
+
+  if (DEFINED CMAKE_CXX_COMPILER_TARGET)
+    set(compiler_target --target ${CMAKE_CXX_COMPILER_TARGET})
+  elseif (DEFINED LLVM_DEFAULT_TARGET_TRIPLE)
+    set(compiler_target --target ${LLVM_DEFAULT_TARGET_TRIPLE})
+  else()
+    set(compiler_target "")
+  endif()
+
+  if (DEFINED CMAKE_OSX_SYSROOT)
+    set(isysroot --isysroot ${CMAKE_OSX_SYSROOT})
+  else()
+    set(isysroot "")
+  endif()
+
+  add_custom_command(OUTPUT "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap"
+    DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/generate_module_map.py"
+            "${LIBCXX_INTERMEDIATES_DIR}/module.modulemap"
+            "${LIBCXX_INTERMEDIATES_DIR}/internal_module_attributes.json"
+            ${_all_includes}
+    COMMAND "${Python3_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/generate_module_map.py"
+            --libcxx-include-directory "${LIBCXX_GENERATED_INCLUDE_DIR}"
+            ${libcxx_include_target_directory}
+            --intermediates-directory "${LIBCXX_INTERMEDIATES_DIR}"
+            --cxx-compiler "${CMAKE_CXX_COMPILER}"
+            ${compiler_target}
+            ${isysroot}
+    COMMENT "Generating clang module map module.modulemap")
+
+  list(APPEND _all_includes "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap")
+endif()
+
 add_custom_target(generate-cxx-headers ALL DEPENDS ${_all_includes})
 
 add_library(cxx-headers INTERFACE)
 target_link_libraries(cxx-headers INTERFACE libcxx-abi-headers)
 add_dependencies(cxx-headers generate-cxx-headers)
 target_include_directories(cxx-headers INTERFACE ${LIBCXX_GENERATED_INCLUDE_DIR}
                                                  ${LIBCXX_GENERATED_INCLUDE_TARGET_DIR})
 
if (LIBCXX_INSTALL_HEADERS)
 
   # Install the generated __config_site file to the per-target include dir.
   install(FILES "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site"
     DESTINATION "${LIBCXX_INSTALL_INCLUDE_TARGET_DIR}"
     PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     COMPONENT cxx-headers)
 
   # Install the generated modulemap file to the generic include dir.
+  if (EXISTS "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap")
     install(FILES "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap"
       DESTINATION "${LIBCXX_INSTALL_INCLUDE_DIR}"
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
       COMPONENT cxx-headers)
+  endif()
 
   if (NOT CMAKE_CONFIGURATION_TYPES)
     add_custom_target(install-cxx-headers
                       DEPENDS cxx-headers
                       COMMAND "${CMAKE_COMMAND}"
                               -DCMAKE_INSTALL_COMPONENT=cxx-headers
                               -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
     # Stripping is a no-op for headers
     add_custom_target(install-cxx-headers-stripped DEPENDS install-cxx-headers)
   endif()
 endif()

libcxx/include/generate_module_map.py

+# ===----------------------------------------------------------------------===##
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===##
+
+import argparse
+import json
+import operator
+import os
+import pathlib
+import posixpath
+import re
+import subprocess
+import typing
+
+
+# The private libc++ detail headers are interdependent such that putting all
+# of the e.g. __algorithm/*.h headers in a single module will result in module
+# cycles with other libc++ modules. This script figures out how to group the
+# private headers in the minimum number of modules per directory using the
+# following system.
+# 1. Run the preprocessor to get the includes of every libc++ header.
+# 2. Build an include tree from the preprocessor output.
+# 3. For each private header, collect the list of headers that transitively
+#    include it, and it transitively includes.
+# 4. Convert the private headers and their transitive includes into modules.
+# 5  Merge modules that are in the same directory and don't create a module
+#    cycle. Modules can be merged if the includers of each module are not in
+#    the includees of the other module. In other words, if they're at the same
+#    level of the module tree.
+# This is quite similar to a disjoint-set/union-find forest, and could possibly
+# be reimplemented as such.
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--libcxx-include-directory", required=True)
+    parser.add_argument("--libcxx-include-target-directory")
+    parser.add_argument("--intermediates-directory", required=True)
+    parser.add_argument("--cxx-compiler", required=True)
+    parser.add_argument("--target")
+    parser.add_argument("--isysroot")
+    args = parser.parse_args()
+
+    with open(
+        os.path.join(args.intermediates_directory, "internal_module_attributes.json")
+    ) as module_attributes_file:
+        module_attributes = json.load(module_attributes_file)
+    validate_exports(
+        args.libcxx_include_directory,
+        args.libcxx_include_target_directory,
+        args.intermediates_directory,
+        module_attributes,
+    )
+    libcxx_includes_path = os.path.join(
+        args.intermediates_directory, "libcxx_includes.cpp"
+    )
+    with open(libcxx_includes_path, "w") as libcxx_includes_file:
+        write_libcxx_includes(args.libcxx_include_directory, libcxx_includes_file)
+    include_tree = build_include_tree(
+        args.cxx_compiler,
+        args.target,
+        args.isysroot,
+        args.libcxx_include_directory,
+        args.libcxx_include_target_directory,
+        libcxx_includes_path,
+        module_attributes,
+    )
+    private_headers_by_directory = collect_transitive_includes(include_tree)
+    modules_by_directory = build_modules(private_headers_by_directory)
+    write_module_map(
+        modules_by_directory,
+        args.libcxx_include_directory,
+        args.intermediates_directory,
+        module_attributes,
+    )
+    sanity_check_module_map(args.libcxx_include_directory, include_tree)
+
+
+def validate_exports(
+    libcxx_include_directory: str,
+    libcxx_include_target_directory: str,
+    intermediates_directory: str,
+    module_attributes: typing.Dict[str, dict],
+) -> None:
+    # Behavior is undefined if a module exports something that none of its headers include.
+    def export_is_valid_in_header(export: str, header: str) -> bool:
+        def find_include_in_header(
+            include_regular_expression: re.Pattern, header_file: typing.TextIO
+        ) -> bool:
+            for line in header_file:
+                if include_regular_expression.search(line):
+                    return True
+            return False
+
+        # Exports can be either a placeholder for a private header or a real module
+        # name. It's assumed that module names can be mapped to header names by
+        # stripping std_ and converting a trailing _h to .h.
+        include = export
+        if include.startswith("std_"):
+            include = include[len("std_") :]
+            if include.endswith("_h"):
+                include = include[: -len("_h")] + ".h"
+        include_regular_expression = re.compile(
+            r"# *include <" + re.escape(include) + r">"
+        )
+
+        try:
+            with open(os.path.join(libcxx_include_directory, header)) as header_file:
+                return find_include_in_header(include_regular_expression, header_file)
+        except FileNotFoundError:
+            if libcxx_include_target_directory != libcxx_include_directory:
+                with open(
+                    os.path.join(libcxx_include_target_directory, header)
+                ) as header_file:
+                    return find_include_in_header(
+                        include_regular_expression, header_file
+                    )
+            else:
+                raise
+
+    invalid_exports = {}
+
+    # Go through the module map lines in reverse order. This makes some simplifying
+    # assumptions.
+    # 1. `export` comes after all the `header`s in the module.
+    # 2. There's only 1 `header` per module, or at least the last listed header in the
+    #    module is the one that includes the export.
+    with open(os.path.join(intermediates_directory, "module.modulemap")) as module_map:
+        module_map_lines = list(reversed(list(module_map)))
+
+    # Exports can be of three forms.
+    # 1. A real module like `export std_cstddef`.
+    # 2. A placeholder for a private file like `export "__fwd/span.h"`.
+    # 3. A wildcard `export *`, which doesn't need to be validated.
+    specific_export_regular_expression = re.compile(r'export "?([\w./]+)')
+    header_regular_expression = re.compile(r'header "(.*)"')
+    for line_index, module_map_line in enumerate(module_map_lines):
+        export_match = specific_export_regular_expression.search(module_map_line)
+        if export_match:
+            found_header_match = False
+            for remaining_line in module_map_lines[line_index:]:
+                header_match = header_regular_expression.search(remaining_line)
+                if header_match:
+                    found_header_match = True
+                    if not export_is_valid_in_header(export_match[1], header_match[1]):
+                        invalid_exports.setdefault(header_match[1], []).append(
+                            export_match[1]
+                        )
+                    break
+            assert found_header_match, f"Failed to find header for {export_match[1]}"
+
+    # Go through the module attributes. (Some of the entries are directories, but
+    # those don't have exports.)
+    for header, header_module_attributes in module_attributes.items():
+        for export in header_module_attributes.get("exports", []):
+            if (export != "*") and not export_is_valid_in_header(export, header):
+                invalid_exports.setdefault(header, []).append(export)
+
+    if invalid_exports:
+        for header, exports in invalid_exports.items():
+            print("Module for <", header, "> has invalid exports", sep="")
+            for export in exports:
+                print("    ", export)
+            print()
+        exit(1)
+
+
+def write_libcxx_includes(
+    libcxx_include_directory: str, libcxx_includes_file: typing.TextIO
+) -> None:
+    for directory, subdirectorynames, filenames in os.walk(libcxx_include_directory):
+        if directory == libcxx_include_directory:
+            include_root = ""
+            # The ext, and __support headers are not included in the module. Not all of
+            # the __pstl headers compile, so exclude that directory too, even though some
+            # of the headers will be pulled in transitively and modularized.
+            subdirectorynames.remove("ext")
+            subdirectorynames.remove("__pstl")
+            subdirectorynames.remove("__support")
+        else:
+            include_root = pathlib.PurePath(
+                os.path.relpath(directory, libcxx_include_directory)
+            ).as_posix()
+
+        subdirectorynames.sort()
+        for filename in sorted(filenames):
+            # The __pstl and cxxabi headers are not included in the module.
+            if (directory == libcxx_include_directory) and (
+                filename.startswith("__pstl_") or ("cxxabi" in filename)
+            ):
+                continue
+
+            extension = os.path.splitext(filename)[1]
+            if (
+                (not extension)
+                or (extension == ".h")
+                or (extension == ".hh")
+                or (extension == ".hp")
+                or (extension == ".hpp")
+                or (extension == ".hxx")
+                or (extension == ".h++")
+                or (extension == ".ipp")
+            ):
+                # Only extension-less and .h headers should be present, but allow for any C++ header file.
+                libcxx_includes_file.write("#include <")
+                libcxx_includes_file.write(posixpath.join(include_root, filename))
+                libcxx_includes_file.write(">\n")
+
+
+def build_include_tree(
+    cxx_compiler: str,
+    target: typing.Optional[str],
+    isysroot: typing.Optional[str],
+    libcxx_include_directory: str,
+    libcxx_include_target_directory: typing.Optional[str],
+    libcxx_includes_path: str,
+    module_attributes: typing.Dict[str, dict],
+) -> typing.Iterable["Header"]:
+    headers = {}  # header objects keyed by path
+    # includes vary by standard, so all standards need to be run, and the includes unioned.
+    for standard in ["c++98", "c++11", "c++14", "c++17", "c++20", "c++2b"]:
+        cxx_command = [cxx_compiler]
+        if target:
+            cxx_command += ["-target", target]
+        if isysroot:
+            cxx_command += ["-isysroot", isysroot]
+        cxx_command += ["-E", "-H", "-fshow-skipped-includes"]
+        cxx_command.append("-std=" + standard)
+        cxx_command.append("-D_LIBCPP_ENABLE_EXPERIMENTAL")
+        if standard != "c++98":
+            cxx_command.append("-D_LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY")
+        cxx_command.append("-nostdinc++")
+        cxx_command += ["-cxx-isystem", libcxx_include_directory]
+        if libcxx_include_target_directory:
+            cxx_command += ["-cxx-isystem", libcxx_include_target_directory]
+        cxx_command.append("-w")
+        cxx_command.append(libcxx_includes_path)
+
+        # Don't require the command to succeed, some of the headers have #error directives if features
+        # are disabled like threads, locales, wide characters, etc. Those headers just don't show any
+        # includes which is fine.
+        includes = subprocess.run(
+            cxx_command,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.PIPE,
+            text=True,
+        ).stderr
+
+        # Consider 'a' that includes 'b' and 'c', 'b' that includes 'c', and 'c' that includes
+        # nothing. All three headers have header guards. For an input file that includes all three,
+        # -H -fshow-skipped-includes will look like this.
+        # . /a
+        # .. /b
+        # ... /c
+        # .. /c
+        # . /b
+        # . /c
+        # The last three lines are skipped includes - a's include of c is skipped because c has already
+        # been seen via b, and same with the input file's includes of b and c that have already been seen
+        # via a and b. Skipped includes do not re-list any of their includes, which is why there isn't a
+        # ".. /c" under ". /b". The first time a header is seen, it will show all of its direct includes
+        # and potentially some of its transitive includes. Headers without header guards are not skipped,
+        # and can have different includes depending on the context.
+        header_stack = []  # list of tuples (level, path)
+        for line in includes.splitlines():
+            if not line.startswith("."):
+                continue
+
+            dots, include = line.split(" ", maxsplit=1)
+            level = len(dots)
+            current_header = headers.setdefault(
+                include, Header(include, libcxx_include_directory, module_attributes)
+            )
+
+            while header_stack and (level <= header_stack[-1][0]):
+                del header_stack[-1]
+
+            if header_stack:
+                parent_header = header_stack[-1][1]
+                parent_header.included_headers.add(current_header)
+                current_header.including_headers.add(parent_header)
+
+            header_stack.append((level, current_header))
+    return headers.values()
+
+
+def collect_transitive_includes(
+    include_tree: typing.Iterable["Header"],
+) -> typing.Dict[str, typing.List["Header"]]:
+    def collect_transitive_includes_for_header(
+        header: "Header",
+        include_attribute: str,
+        transitive_include_attribute: str,
+        should_detect_cycles: bool,
+    ) -> typing.Set[typing.Tuple["Header"]]:
+        transitive_includes = getattr(header, transitive_include_attribute)
+
+        # includes_to_follow is a list of sets of headers. It starts out as the
+        # includes from the header being analyzed. One of the includes is taken
+        # from the last set, and its includes are added to the end of the list.
+        # Another include is selected from the new last set, and so on until the
+        # include path hits the end, or a cycle is detected. After that, the
+        # include path removes its last include, and a sibling include from the
+        # last set is selected. When there are no more siblings, the include path
+        # goes up a level until eventually there are no more includes to process.
+        includes = getattr(header, include_attribute)
+        includes_to_follow = [includes.copy()] if includes else []
+        include_path = [header]
+
+        seen_headers = {header}
+        cycles = set()
+        while includes_to_follow:
+            selected_header = includes_to_follow[-1].pop()
+            transitive_includes.add(selected_header)
+
+            include_path.append(selected_header)
+            selected_header_includes = getattr(selected_header, include_attribute)
+
+            if should_detect_cycles:
+                cycles |= detect_cycles(include_path, selected_header_includes)
+
+            selected_header_includes_to_follow = selected_header_includes - seen_headers
+            if selected_header_includes_to_follow:
+                includes_to_follow.append(selected_header_includes_to_follow)
+            else:
+                # Hit the end of the include path, peel back a level.
+                del include_path[-1]
+
+                # Peel back the completed levels.
+                while includes_to_follow and not includes_to_follow[-1]:
+                    del includes_to_follow[-1]
+                    del include_path[-1]
+
+            seen_headers.add(selected_header)
+
+        return cycles
+
+    private_headers_by_directory = {}
+    cycles = set()
+    for header in include_tree:
+        if not header.is_private_libcxx_header:
+            continue
+
+        # The same cycles should be returned as the graph is traversed up and down. Just collect them
+        # from the included headers since that's the more intuitive direction ("a includes b includes c
+        # includes a" rather than "c is included by b is included by a is included by c").
+        collect_transitive_includes_for_header(
+            header,
+            "including_headers",
+            "transitive_including_headers",
+            should_detect_cycles=False,
+        )
+        cycles |= collect_transitive_includes_for_header(
+            header,
+            "included_headers",
+            "transitive_included_headers",
+            should_detect_cycles=True,
+        )
+        private_headers_by_directory.setdefault(header.module_directory, []).append(
+            header
+        )
+
+    if cycles:
+        print(
+            "Include cycles detected across libc++ modules, these must be broken before modules can be made for the libc++ private headers\n"
+        )
+        for cycle in sorted(cycles):
+            for header in cycle:
+                print(header.path)
+            print()
+        exit(1)
+
+    return private_headers_by_directory
+
+
+def detect_cycles(
+    include_path: typing.List["Header"], next_includes: typing.Set["Header"]
+) -> typing.Set[typing.Tuple["Header"]]:
+    cycles = set()
+    for index, include_header in enumerate(include_path):
+        if include_header in next_includes:
+            # Include cycles are only a problem if they cross module boundaries.
+            # If the cycle just consists of non-libc++ headers, then presumably
+            # those are all in the same module and it's fine.
+            #
+            # If only one libc++ header is involved, then it's unclear if the
+            # cycle needs to be broken in libc++ or externally. Don't report
+            # that cycle either, if the non-libc++ headers are in a
+            # [no_undeclared_includes] module, then that will break the cycle.
+            # Otherwise, the module cycle should be caught in the modules_include
+            # unit test and a strategy can be devised from there.
+            #
+            # A cycle involving only private headers in the same directory isn't
+            # technically a problem if those headers could be grouped into the
+            # same module. However, figuring out if the headers can be grouped is
+            # tricky at this point, and there aren't currently any such cycles.
+            # For now, don't allow that situation.
+            cycle_header_crosses_module_boundary = True
+            libcxx_header_count = 0
+            cycle = include_path[index:]
+            for cycle_header in cycle:
+                if not cycle_header_crosses_module_boundary:
+                    cycle_header_crosses_module_boundary = (
+                        cycle_header in extra_modular_libcxx_headers
+                    )
+                if cycle_header.is_libcxx_header:
+                    libcxx_header_count += 1
+
+                if cycle_header_crosses_module_boundary and (libcxx_header_count >= 2):
+                    # The include cycle could potentially be entered at any point and
+                    # thus get double reported, i.e. as a -> b -> a and b -> a -> b.
+                    # Rotate the cycle so that the smallest item is at the end points.
+                    # For the above cycle, assume that include_path = cycle = [b, a]
+                    # and b is in next_includes. Report (a, b, a) as the cycle by
+                    # starting at a and going to the end, then going from the start
+                    # back to and including a.
+                    starting_point = cycle.index(min(cycle))
+                    cycles.add(
+                        (*cycle[starting_point:], *cycle[: (starting_point + 1)])
+                    )
+                    break
+    return cycles
+
+
+def build_modules(
+    private_headers_by_directory: typing.Dict[str, typing.List["Header"]]
+) -> typing.Dict[str, "Module"]:
+    # Build the initial set of modules.
+    modules_by_directory, all_modules = group_headers_into_modules(
+        private_headers_by_directory
+    )
+
+    # The modules essentially constitute a module tree parallel to the include tree*. Enumerate
+    # the modules and merge them where it doesn't create a cycle. Module a and b can be merged
+    # if none of b's including modules are included by a, and if none of a's including modules
+    # are included by b. Multiple passes are required, consider a -> c -> b. On the first pass,
+    # a and b can't be merged because that would make a cycle ab -> c -> ab. However a and c
+    # can be merged: ac -> b. On the second pass, ac can merge with b. Keep looping until no
+    # more merges can be made.
+    #
+    # * "essentially" because only the private libc++ headers are put into modules, the remaining
+    # headers stay as headers and are optimistically treated like modules. The libc++ public headers
+    # are each in their own standalone module, except for the experimental headers which are all
+    # together in a single module. It's assumed that the experimental module sits strictly on top
+    # of all of the other libc++ modules. That is, nothing includes experimental headers except other
+    # experimental headers, they'll never show up in any module's included headers, and so they won't
+    # effectively matter for grouping. The non-libc++ headers are optimistically assumed to be in
+    # individual modules. If that isn't the case, then it's possible that they can cause module cycles.
+    # The modules_include unit test will catch those, and if there are any then a strategy can be
+    # found to solve the cycle.
+    did_merge = True
+    while did_merge:
+        did_merge, modules_by_directory = merge_modules(
+            modules_by_directory, all_modules
+        )
+
+    # The module lists in modules_for_directory are sorted so that the headers roughly come out in
+    # alphabetical order. If headers are grouped into modules acf, be, d, then the modules will be
+    # in that order, except reversed for ease of list enumeration. Reverse the lists so that they're
+    # in the right order before returning them. The headers in each module are unsorted, e.g. the
+    # first module might actually be afc, sort those so that they're in the right order too.
+    for directory, modules_for_directory in modules_by_directory.items():
+        for module in modules_for_directory:
+            module.headers.sort(key=operator.attrgetter("submodule_name"))
+        modules_for_directory.reverse()
+    return modules_by_directory
+
+
+def group_headers_into_modules(
+    private_headers_by_directory: typing.Dict[str, typing.List["Header"]]
+) -> typing.Tuple[typing.Dict[str, "Module"], typing.List["Module"]]:
+    # Headers are safe to group if their including and included headers match, modulo each other.
+    # In other words, if a and b's transitive includes match except that a includes b and b is
+    # included by a, then they can be grouped. It's tempting to try to more aggressively group
+    # headers that look like they're at the same level in the include tree, however that can
+    # create module cycles. e.g. a1 -> b1, b2 -> a2. None of a2's including headers are included
+    # by a1 and vice versa, and same with b2 and b1. However, if the a's and b's are both grouped
+    # into modules, then a1a2 -> b1b2 -> a1a2 and it's a module cycle. Start simple with the
+    # initial modules and only do the failsafe grouping.
+    def has_differing_transitive_includes(
+        module: "Module", header: "Header", include_attribute: str
+    ) -> bool:
+        differing_transitive_includes = getattr(module, include_attribute) ^ getattr(
+            header, include_attribute
+        )
+        differing_transitive_includes.discard(header)
+        differing_transitive_includes.difference_update(module.headers)
+        return bool(differing_transitive_includes)
+
+    modules = []
+    modules_by_directory = {}
+    modules_by_header = {}
+    for directory, headers in private_headers_by_directory.items():
+        # Visit the headers in alphabetical order. Reverse the headers and then enumerate
+        # them in reverse so that the consumed headers can be removed while enumerating.
+        sorted_headers = sorted(
+            headers, key=operator.attrgetter("submodule_name"), reverse=True
+        )
+        modules_for_directory = modules_by_directory.setdefault(directory, [])
+        while sorted_headers:
+            header = sorted_headers.pop()
+            module = Module(header)
+            modules_by_header[header] = module
+            index = -1
+            for candidate_header in reversed(sorted_headers):
+                if (
+                    not has_differing_transitive_includes(
+                        module, candidate_header, "transitive_including_headers"
+                    )
+                ) and (
+                    not has_differing_transitive_includes(
+                        module, candidate_header, "transitive_included_headers"
+                    )
+                ):
+                    module.headers.append(candidate_header)
+                    module.transitive_including_headers.discard(candidate_header)
+                    module.transitive_included_headers.discard(candidate_header)
+
+                    modules_by_header[candidate_header] = module
+                    del sorted_headers[index]
+                else:
+                    index -= 1
+            modules.append(module)
+            # Set up the modules for directory in reverse order so that they can
+            # be enumerated and trimmed in reverse order below in similar fashion
+            # to the headers here.
+            modules_for_directory.insert(0, module)
+
+    # Replace the private headers in the modules' including/included headers with their new modules.
+    def replace_headers_with_modules(
+        module: "Module", headers_attribute: str, modules_attribute: str
+    ) -> None:
+        transitive_headers = getattr(module, headers_attribute)
+        transitive_modules = getattr(module, modules_attribute)
+        headers_with_modules = set()
+        for header in transitive_headers:
+            module_for_header = modules_by_header.get(header)
+            if module_for_header:
+                headers_with_modules.add(header)
+                transitive_modules.add(module_for_header)
+        transitive_headers -= headers_with_modules
+
+    for module in modules:
+        replace_headers_with_modules(
+            module, "transitive_including_headers", "transitive_including_modules"
+        )
+        replace_headers_with_modules(
+            module, "transitive_included_headers", "transitive_included_modules"
+        )
+
+    return modules_by_directory, modules
+
+
+def merge_modules(
+    modules_by_directory: typing.Dict[str, "Module"], all_modules: typing.List["Module"]
+) -> typing.Tuple[bool, typing.Dict[str, "Module"]]:
+    def merge_transitive_module_includes(
+        surviving_module: "Module",
+        module_being_merged: "Module",
+        transitive_modules_attribute: str,
+    ) -> None:
+        transitive_modules = getattr(surviving_module, transitive_modules_attribute)
+        transitive_modules |= getattr(module_being_merged, transitive_modules_attribute)
+        # If the modules being merged included each other, remove those references.
+        transitive_modules.discard(surviving_module)
+        transitive_modules.discard(module_being_merged)
+
+    def update_transitive_module_includes(
+        module: "Module",
+        surviving_module: "Module",
+        module_being_merged: "Module",
+        transitive_modules_attribute: str,
+    ) -> None:
+        transitive_modules = getattr(module, transitive_modules_attribute)
+        if (surviving_module in transitive_modules) and (
+            module_being_merged not in transitive_modules
+        ):
+            transitive_modules |= getattr(
+                module_being_merged, transitive_modules_attribute
+            )
+        if module_being_merged in transitive_modules:
+            if surviving_module not in transitive_modules:
+                transitive_modules.add(surviving_module)
+                transitive_modules |= getattr(
+                    surviving_module, transitive_modules_attribute
+                )
+            transitive_modules.remove(module_being_merged)
+
+    # Use the same double-reversed strategy as was used to enumerate the headers.
+    did_merge = False
+    merged_modules_by_directory = {}
+    for directory, modules_for_directory in modules_by_directory.items():
+        merged_modules_for_directory = merged_modules_by_directory.setdefault(
+            directory, []
+        )
+        while modules_for_directory:
+            module = modules_for_directory.pop()
+            index = -1
+            for candidate_module in reversed(modules_for_directory):
+                # Modules can be merged as long as it won't create a module cycle. Module a and b can be merged
+                # if none of b's including modules are included by a, and if none of a's including modules are
+                # included by b. The headers that don't have known modules are treated as if they're in their
+                # own standalone module, see the comment in build_modules.
+                if (
+                    candidate_module.transitive_including_headers.isdisjoint(
+                        module.transitive_included_headers
+                    )
+                    and module.transitive_including_headers.isdisjoint(
+                        candidate_module.transitive_included_headers
+                    )
+                    and candidate_module.transitive_including_modules.isdisjoint(
+                        module.transitive_included_modules
+                    )
+                    and module.transitive_including_modules.isdisjoint(
+                        candidate_module.transitive_included_modules
+                    )
+                ):
+                    # Update the rest of the modules with the merge. This needs to happen after every
+                    # merge so that subsequent merge attempts can correctly identify cycles. For
+                    # a1 -> b1, b2 -> a2, a1 and a2 will be merged into a1a2. b1 and b2 need to be
+                    # updated to a1a2 -> b1, b2 -> a1a2 so that they don't get merged and create a cycle.
+                    # Another scenario is a -> b, c -> d, e -> a. If d and e merge, c needs to not only
+                    # replace d with de, but it also has to add all of e's transitive includes, i.e. a,
+                    # so that c doesn't later merge with b and cause a cycle a -> bc -> de -> a.
+                    all_modules.remove(candidate_module)
+                    for module_to_update in all_modules:
+                        update_transitive_module_includes(
+                            module_to_update,
+                            module,
+                            candidate_module,
+                            "transitive_including_modules",
+                        )
+                        update_transitive_module_includes(
+                            module_to_update,
+                            module,
+                            candidate_module,
+                            "transitive_included_modules",
+                        )
+
+                    # Merge the candidate module.
+                    module.headers += candidate_module.headers
+                    module.transitive_including_headers |= (
+                        candidate_module.transitive_including_headers
+                    )
+                    module.transitive_included_headers |= (
+                        candidate_module.transitive_included_headers
+                    )
+                    merge_transitive_module_includes(
+                        module, candidate_module, "transitive_including_modules"
+                    )
+                    merge_transitive_module_includes(
+                        module, candidate_module, "transitive_included_modules"
+                    )
+
+                    did_merge = True
+                    del modules_for_directory[index]
+                else:
+                    index -= 1
+            merged_modules_for_directory.insert(0, module)
+
+    return did_merge, merged_modules_by_directory
+
+
+def write_module_map(
+    modules_by_directory: typing.Dict[str, typing.List["Module"]],
+    libcxx_include_directory: str,
+    intermediates_directory: str,
+    module_attributes: typing.Dict[str, dict],
+) -> None:
+    # Figure out all of the module names to resolve the exports from the module attributes.
+    sorted_directories_and_modules = sorted(
+        modules_by_directory.items(), key=operator.itemgetter(0)
+    )
+    libcxx_include_directory_as_posix = pathlib.PurePath(
+        libcxx_include_directory
+    ).as_posix()
+    module_names_by_relative_include_path = {}
+    for directory, modules in sorted_directories_and_modules:
+        module_name_base = "std_private"
+        if directory != libcxx_include_directory:
+            directory_name = posixpath.relpath(
+                directory, libcxx_include_directory_as_posix
+            )
+            # Some directories are suffixed with '_dir' to not collide with header names. e.g. <locale>'s
+            # private headers are in __locale_dir because there's already a __locale file. Drop the '_dir'
+            # from the module name.
+            if directory_name.endswith("_dir"):
+                directory_name = directory_name[: -len("_dir")]
+            module_name_base += "_" + directory_name.lstrip("_").replace(
+                posixpath.sep, "_"
+            )
+
+        module_number = 1
+        use_module_number = len(modules) > 1
+
+        for module in modules:
+            module_name = module_name_base
+            if use_module_number:
+                module_name += "_" + str(module_number)
+            module.name = module_name
+
+            for header in module.headers:
+                module_names_by_relative_include_path[
+                    header.libcxx_include_relative_path
+                ] = (module_name + "." + header.submodule_name)
+
+            module_number += 1
+
+    with open(
+        os.path.join(libcxx_include_directory, "module.modulemap"), "w"
+    ) as destination_module_map:
+        # Append the dynamically generated private modules to the statically defined public modules in the
+        # intermediates directory. Public modules in the static module map export private modules using the
+        # header name in quotes as a placeholder. Replace that with the actual private module name.
+        export_regular_expression = re.compile(r'export ("(.*)")')
+        with open(
+            os.path.join(intermediates_directory, "module.modulemap")
+        ) as source_module_map:
+            for line in source_module_map:
+                line_to_write = line
+                match = export_regular_expression.search(line)
+                if match:
+                    line_to_write = line[: match.start(1)]
+                    line_to_write += module_names_by_relative_include_path[match[2]]
+                    line_to_write += line[match.end(1) :]
+                destination_module_map.write(line_to_write)
+
+        for directory, modules in sorted_directories_and_modules:
+            directory_module_attributes = module_attributes.get(
+                posixpath.relpath(directory, libcxx_include_directory_as_posix), {}
+            )
+            for module in modules:
+                destination_module_map.write("module ")
+                destination_module_map.write(module.name)
+                destination_module_map.write(" [system] {")
+
+                wrote_directory_requires = False
+                for requires in directory_module_attributes.get("requires", []):
+                    if requires:
+                        destination_module_map.write("\n  ")
+                        destination_module_map.write(requires)
+                        wrote_directory_requires = True
+                if wrote_directory_requires:
+                    destination_module_map.write("\n")
+
+                module_submodule_name_width = 0
+                for header in module.headers:
+                    submodule_name_length = len(header.submodule_name)
+                    if submodule_name_length > module_submodule_name_width:
+                        module_submodule_name_width = submodule_name_length
+
+                for header in module.headers:
+                    header_module_attributes = module_attributes.get(
+                        header.libcxx_include_relative_path, {}
+                    )
+                    needs_multiline = "exports" in header_module_attributes
+                    if not needs_multiline:
+                        # configure_file might have configured all of the requires to "".
+                        for requires in header_module_attributes.get("requires", []):
+                            if requires:
+                                needs_multiline = True
+                                break
+
+                    destination_module_map.write("\n  module ")
+                    destination_module_map.write(
+                        header.submodule_name.ljust(module_submodule_name_width)
+                    )
+
+                    if needs_multiline:
+                        destination_module_map.write(" {")
+                        for requires in header_module_attributes.get("requires", []):
+                            if requires:
+                                destination_module_map.write("\n    ")
+                                destination_module_map.write(requires)
+                        destination_module_map.write("\n    ")
+                    else:
+                        destination_module_map.write(" { ")
+
+                    if header_module_attributes.get("textual"):
+                        destination_module_map.write("textual ")
+                    destination_module_map.write('header "')
+                    destination_module_map.write(header.libcxx_include_relative_path)
+
+                    if needs_multiline:
+                        destination_module_map.write('"')
+                        for export in header_module_attributes.get("exports", []):
+                            # export can be a relative header path in the case of the
+                            # private headers, a module name in the case of the statically
+                            # declared modules, or "*".
+                            exported_module = module_names_by_relative_include_path.get(
+                                export, export
+                            )
+                            destination_module_map.write("\n    export ")
+                            destination_module_map.write(exported_module)
+                        destination_module_map.write("\n  }")
+                    else:
+                        destination_module_map.write('" }')
+                destination_module_map.write("\n}\n")
+
+
+def sanity_check_module_map(
+    libcxx_include_directory: str, include_tree: typing.Iterable["Header"]
+):
+    with open(
+        os.path.join(libcxx_include_directory, "module.modulemap")
+    ) as module_map_file:
+        module_map_contents = module_map_file.read()
+    missing_public_headers = []
+    missing_private_headers = []
+    public_headers_in_multiple_modules = []
+    private_headers_in_multiple_modules = []
+    for header in include_tree:
+        if not header.is_libcxx_header:
+            continue
+
+        # Super basic sanity check: make sure that every header selected by write_libcxx_includes
+        # ends up in exactly one module in the module map.
+        header_statement = 'header "' + header.libcxx_include_relative_path + '"'
+        first_header_match = module_map_contents.find(header_statement)
+        if first_header_match == -1:
+            if header.is_private_libcxx_header:
+                missing_private_headers.append(header)
+            else:
+                missing_public_headers.append(header)
+        elif module_map_contents.find(header_statement, first_header_match + 1) != -1:
+            if header.is_private_libcxx_header:
+                private_headers_in_multiple_modules.append(header)
+            else:
+                public_headers_in_multiple_modules.append(header)
+
+    if missing_public_headers:
+        print("module.modulemap.in is missing public headers:")
+        for header in missing_public_headers:
+            print("  ", header.libcxx_include_relative_path)
+        print()
+    if missing_private_headers:
+        print("generate_module_map.py failed to generate modules for private headers:")
+        for header in missing_private_headers:
+            print("  ", header.libcxx_include_relative_path)
+        print()
+    if public_headers_in_multiple_modules:
+        print("public headers in module.modulemap.in are in multiple modules:")
+        for header in public_headers_in_multiple_modules:
+            print("  ", header.libcxx_include_relative_path)
+        print()
+    if private_headers_in_multiple_modules:
+        print(
+            "private headers generated by generate_module_map.py are in multiple modules:"
+        )
+        for header in private_headers_in_multiple_modules:
+            print("  ", header.libcxx_include_relative_path)
+        print()
+    if (
+        missing_public_headers
+        or missing_private_headers
+        or public_headers_in_multiple_modules
+        or private_headers_in_multiple_modules
+    ):
+        exit(1)
+
+
+class Header:
+    def __init__(
+        self,
+        path: str,
+        libcxx_include_directory: str,
+        module_attributes: typing.Dict[str, dict],
+    ) -> None:
+        self.path = path
+        try:
+            self.libcxx_include_relative_path = pathlib.PurePath(
+                os.path.relpath(path, libcxx_include_directory)
+            ).as_posix()
+        except ValueError:
+            self.libcxx_include_relative_path = ".."
+        if posixpath.commonpath([self.libcxx_include_relative_path, ".."]):
+            self.is_libcxx_header = False
+            self.libcxx_include_relative_path = ""
+            self.is_private_libcxx_header = False
+            self.module_directory = pathlib.PurePath(os.path.dirname(path)).as_posix()
+            self.submodule_name = ""
+        else:
+            self.is_libcxx_header = True
+            if self.libcxx_include_relative_path.startswith("__"):
+                self.is_private_libcxx_header = True
+
+                header_module_attributes = module_attributes.get(
+                    self.libcxx_include_relative_path, {}
+                )
+
+                module_directory = header_module_attributes.get("module_directory", "")
+                if not module_directory:
+                    module_directory_parent = posixpath.dirname(
+                        self.libcxx_include_relative_path
+                    )
+                    while module_directory_parent:
+                        module_directory = module_directory_parent
+                        module_directory_parent = posixpath.dirname(module_directory)
+                if module_directory:
+                    self.module_directory = posixpath.join(
+                        pathlib.PurePath(libcxx_include_directory).as_posix(),
+                        module_directory,
+                    )
+                else:
+                    self.module_directory = pathlib.PurePath(
+                        libcxx_include_directory
+                    ).as_posix()
+
+                submodule_name = header_module_attributes.get("submodule_name")
+                if not submodule_name:
+                    path_as_posix = pathlib.PurePath(path).as_posix()
+                    if (
+                        posixpath.commonpath([path_as_posix, self.module_directory])
+                        == self.module_directory
+                    ):
+                        submodule_name = posixpath.relpath(
+                            path_as_posix, self.module_directory
+                        ).replace(posixpath.sep, "_")
+                    else:
+                        submodule_name = os.path.basename(path)
+                    if submodule_name.endswith(".h"):
+                        submodule_name = submodule_name[: -len(".h")]
+                self.submodule_name = submodule_name
+            else:
+                self.is_private_libcxx_header = False
+                self.module_directory = pathlib.PurePath(
+                    os.path.dirname(path)
+                ).as_posix()
+                self.submodule_name = ""
+
+        self.including_headers = set()
+        self.included_headers = set()
+        self.transitive_including_headers = set()
+        self.transitive_included_headers = set()
+
+    def __repr__(self) -> str:
+        return f"<{type(self).__name__} {self.path}>"
+
+    def __hash__(self) -> int:
+        return hash(self.path)
+
+    def __eq__(self, other) -> bool:
+        return self.path == other.path
+
+    def __ne__(self, other) -> bool:
+        return self.path != other.path
+
+    def __lt__(self, other) -> bool:
+        return self.path < other.path
+
+    def __le__(self, other) -> bool:
+        return self.path <= other.path
+
+    def __gt__(self, other) -> bool:
+        return self.path > other.path
+
+    def __ge__(self, other) -> bool:
+        return self.path >= other.path
+
+
+class Module:
+    def __init__(self, header: Header) -> None:
+        self.name = ""
+        self.headers = [header]
+        self.transitive_including_headers = header.transitive_including_headers.copy()
+        self.transitive_included_headers = header.transitive_included_headers.copy()
+        self.transitive_including_modules = set()
+        self.transitive_included_modules = set()
+
+    def __repr__(self) -> str:
+        return f"<{type(self).__name__} headers = {self.headers}>"
+
+
+main()

libcxx/include/internal_module_attributes.json.in

+{
+    "__assert": {
+        "exports": [
+            "*"
+        ]
+    },
+    "__availability": {
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+    "__ranges/size.h": {
+        "exports": [
+            "__type_traits/make_unsigned.h"
+        ]
+    },
+    "__ranges/subrange.h": {
+        "exports": [
+            "__fwd/subrange.h"
+        ]
+    },
+    "__ranges/transform_view.h": {
+        "exports": [
+            "__functional/bind_back.h",
+            "__functional/perfect_forward.h",
+            "__ranges/movable_box.h"
+        ]
+    },
+    "__stop_token/stop_source.h": {
+        "exports": [
+            "*"
+        ]
+    },
+    "__stop_token": {
+        "requires": [
+            "@requires_LIBCXX_ENABLE_THREADS@"
+        ]
+    },
+    "__stop_token/stop_state.h": {
+        "exports": [
+            "*"
+        ]
+    },
+    "__stop_token/stop_token.h": {
+        "exports": [
+            "*"
+        ]
+    },
+    "__string/constexpr_c_functions.h": {
+        "exports": [
+            "__type_traits/is_equality_comparable.h"
+        ]
+    },
+    "__system_error/error_code.h": {
+        "exports": [
+            "__functional/hash.h",
+            "__functional/unary_function.h"
+        ]
+    },
+    "__system_error/error_condition.h": {
+        "exports": [
+            "__functional/hash.h",
+            "__functional/unary_function.h"
+        ]
+    },
+    "__thread": {
+        "requires": [
+            "@requires_LIBCXX_ENABLE_THREADS@"
+        ]
+    },
+    "__thread/thread.h": {
+        "exports": [
+            "*"
+        ]
+    },
+    "__tuple/pair_like.h": {
+        "exports": [
+            "__tuple/tuple_like.h"
+        ]
+    },
+    "__type_traits/add_lvalue_reference.h": {
+        "exports": [
+            "__type_traits/is_referenceable.h"
+        ]
+    },
+    "__type_traits/apply_cv.h": {
+        "exports": [
+            "__type_traits/is_const.h",
+            "__type_traits/is_volatile.h"
+        ]
+    },
+    "__type_traits/common_reference.h": {
+        "exports": [
+            "__type_traits/remove_cvref.h"
+        ]
+    },
+    "__type_traits/common_type.h": {
+        "exports": [
+            "__utility/declval.h"
+        ]
+    },
+    "__type_traits/decay.h": {
+        "exports": [
+            "__type_traits/add_pointer.h"
+        ]
+    },
+    "__type_traits/invoke.h": {
+        "exports": [
+            "__type_traits/conditional.h",
+            "__type_traits/decay.h",
+            "__type_traits/enable_if.h",
+            "__type_traits/is_base_of.h",
+            "__type_traits/is_core_convertible.h",
+            "__type_traits/is_reference_wrapper.h",
+            "__type_traits/is_same.h",
+            "__type_traits/is_void.h",
+            "__type_traits/nat.h",
+            "__type_traits/remove_cv.h"
+        ]
+    },
+    "__type_traits/is_arithmetic.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/is_array.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/is_convertible.h": {
+        "exports": [
+            "__type_traits/is_array.h"
+        ]
+    },
+    "__type_traits/is_core_convertible.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/is_enum.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/is_equality_comparable.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/is_execution_policy.h": {
+        "exports": [
+            "__type_traits/remove_cvref.h"
+        ]
+    },
+    "__type_traits/is_nothrow_destructible.h": {
+        "exports": [
+            "__type_traits/is_destructible.h"
+        ]
+    },
+    "__type_traits/is_nothrow_move_constructible.h": {
+        "exports": [
+            "__type_traits/is_nothrow_constructible.h"
+        ]
+    },
+    "__type_traits/is_null_pointer.h": {
+        "exports": [
+            "std_cstddef"
+        ]
+    },
+    "__type_traits/is_object.h": {
+        "exports": [
+            "__type_traits/is_scalar.h"
+        ]
+    },
+    "__type_traits/is_primary_template.h": {
+        "exports": [
+            "__type_traits/enable_if.h"
+        ]
+    },
+    "__type_traits/is_same.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/is_scalar.h": {
+        "exports": [
+            "__type_traits/is_null_pointer.h"
+        ]
+    },
+    "__type_traits/is_swappable.h": {
+        "exports": [
+            "__type_traits/is_move_constructible.h"
+        ]
+    },
+    "__type_traits/is_void.h": {
+        "exports": [
+            "__type_traits/integral_constant.h"
+        ]
+    },
+    "__type_traits/make_unsigned.h": {
+        "exports": [
+            "__type_traits/is_unsigned.h"
+        ]
+    },
+    "__type_traits/remove_cv.h": {
+        "exports": [
+            "__type_traits/remove_const.h",
+            "__type_traits/remove_volatile.h"
+        ]
+    },
+    "__type_traits/underlying_type.h": {
+        "exports": [
+            "__type_traits/is_enum.h"
+        ]
+    },
+    "__utility/auto_cast.h": {
+        "exports": [
+            "__type_traits/decay.h"
+        ]
+    },
+    "__utility/cmp.h": {
+        "exports": [
+            "__type_traits/make_unsigned.h"
+        ]
+    },
+    "__utility/move.h": {
+        "exports": [
+            "__type_traits/is_copy_constructible.h",
+            "__type_traits/is_nothrow_move_constructible.h",
+            "__type_traits/remove_reference.h"
+        ]
+    },
+    "__utility/pair.h": {
+        "exports": [
+            "__fwd/subrange.h",
+            "__tuple/pair_like.h",
+            "__type_traits/is_assignable.h",
+            "__type_traits/is_constructible.h",
+            "__type_traits/is_convertible.h",
+            "__type_traits/is_copy_assignable.h",
+            "__type_traits/is_move_assignable.h",
+            "__type_traits/is_nothrow_copy_constructible.h",
+            "__type_traits/is_nothrow_default_constructible.h",
+            "__type_traits/is_nothrow_move_assignable.h"
+        ]
+    },
+    "__utility/swap.h": {
+        "exports": [
+            "__type_traits/is_swappable.h"
+        ]
+    }
+}

libcxx/include/module.modulemap.in

module std_shared_mutex [system] {
   export std_version
 }
 module std_source_location [system] {
   header "source_location"
   export *
 }
 module std_span [system] {
   header "span"
-  export std_private_ranges_enable_borrowed_range
+  export "__ranges/enable_borrowed_range.h"
   export std_version
-  export std_private_span_span_fwd
+  export "__fwd/span.h"
 }
 module std_sstream [system] {
   @requires_LIBCXX_ENABLE_LOCALIZATION@
   header "sstream"
   export *
 }
 module std_stack [system] {
   header "stack"
module std_experimental [system] {
   module __memory {
     header "experimental/__memory"
     export *
   }
 }
 
 // Implementation detail headers that are private to libc++. These modules
 // must not be directly imported.
-module std_private_assert            [system] {
-  header "__assert"
-  export *
-}
-module std_private_availability      [system] {
-  header "__availability"
-  export *
-}
-module std_private_bit_reference     [system] {
-  header "__bit_reference"
-  export *
-}
-module std_private_config            [system] {
-  textual header "__config"
-  export *
-}
-module std_private_hash_table        [system] {
-  header "__hash_table"
-  export *
-}
-module std_private_locale            [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__locale"
-  export *
-}
-module std_private_mbstate_t         [system] {
-  header "__mbstate_t.h"
-  export *
-}
-module std_private_node_handle       [system] {
-  header "__node_handle"
-  export *
-}
-module std_private_split_buffer      [system] {
-  header "__split_buffer"
-  export *
-}
-module std_private_std_mbstate_t     [system] {
-  header "__std_mbstate_t.h"
-  export *
-}
-module std_private_threading_support [system] {
-  header "__threading_support"
-  export *
-}
-module std_private_tree              [system] {
-  header "__tree"
-  export *
-}
-module std_private_undef_macros      [system] {
-  textual header "__undef_macros"
-  export *
-}
-module std_private_verbose_abort     [system] {
-  header "__verbose_abort"
-  export *
-}
-
-module std_private_algorithm_adjacent_find                               [system] { header "__algorithm/adjacent_find.h" }
-module std_private_algorithm_all_of                                      [system] { header "__algorithm/all_of.h" }
-module std_private_algorithm_any_of                                      [system] { header "__algorithm/any_of.h" }
-module std_private_algorithm_binary_search                               [system] { header "__algorithm/binary_search.h" }
-module std_private_algorithm_clamp                                       [system] { header "__algorithm/clamp.h" }
-module std_private_algorithm_comp                                        [system] { header "__algorithm/comp.h" }
-module std_private_algorithm_comp_ref_type                               [system] { header "__algorithm/comp_ref_type.h" }
-module std_private_algorithm_copy                                        [system] {
-  header "__algorithm/copy.h"
-  export std_private_algorithm_copy_move_common
-}
-module std_private_algorithm_copy_backward                               [system] { header "__algorithm/copy_backward.h" }
-module std_private_algorithm_copy_if                                     [system] { header "__algorithm/copy_if.h" }
-module std_private_algorithm_copy_move_common                            [system] {
-  header "__algorithm/copy_move_common.h"
-  export std_private_type_traits_is_trivially_copyable
-}
-module std_private_algorithm_copy_n                                      [system] { header "__algorithm/copy_n.h" }
-module std_private_algorithm_count                                       [system] { header "__algorithm/count.h" }
-module std_private_algorithm_count_if                                    [system] { header "__algorithm/count_if.h" }
-module std_private_algorithm_equal                                       [system] { header "__algorithm/equal.h" }
-module std_private_algorithm_equal_range                                 [system] { header "__algorithm/equal_range.h" }
-module std_private_algorithm_fill                                        [system] { header "__algorithm/fill.h" }
-module std_private_algorithm_fill_n                                      [system] { header "__algorithm/fill_n.h" }
-module std_private_algorithm_find                                        [system] {
-  header "__algorithm/find.h"
-  export std_private_algorithm_unwrap_iter
-}
-module std_private_algorithm_find_end                                    [system] { header "__algorithm/find_end.h" }
-module std_private_algorithm_find_first_of                               [system] { header "__algorithm/find_first_of.h" }
-module std_private_algorithm_find_if                                     [system] { header "__algorithm/find_if.h" }
-module std_private_algorithm_find_if_not                                 [system] { header "__algorithm/find_if_not.h" }
-module std_private_algorithm_for_each                                    [system] { header "__algorithm/for_each.h" }
-module std_private_algorithm_for_each_n                                  [system] { header "__algorithm/for_each_n.h" }
-module std_private_algorithm_for_each_segment                            [system] { header "__algorithm/for_each_segment.h" }
-module std_private_algorithm_generate                                    [system] { header "__algorithm/generate.h" }
-module std_private_algorithm_generate_n                                  [system] { header "__algorithm/generate_n.h" }
-module std_private_algorithm_half_positive                               [system] { header "__algorithm/half_positive.h" }
-module std_private_algorithm_in_found_result                             [system] { header "__algorithm/in_found_result.h" }
-module std_private_algorithm_in_fun_result                               [system] { header "__algorithm/in_fun_result.h" }
-module std_private_algorithm_in_in_out_result                            [system] { header "__algorithm/in_in_out_result.h" }
-module std_private_algorithm_in_in_result                                [system] { header "__algorithm/in_in_result.h" }
-module std_private_algorithm_in_out_out_result                           [system] { header "__algorithm/in_out_out_result.h" }
-module std_private_algorithm_in_out_result                               [system] { header "__algorithm/in_out_result.h" }
-module std_private_algorithm_includes                                    [system] { header "__algorithm/includes.h" }
-module std_private_algorithm_inplace_merge                               [system] { header "__algorithm/inplace_merge.h" }
-module std_private_algorithm_is_heap                                     [system] { header "__algorithm/is_heap.h" }
-module std_private_algorithm_is_heap_until                               [system] { header "__algorithm/is_heap_until.h" }
-module std_private_algorithm_is_partitioned                              [system] { header "__algorithm/is_partitioned.h" }
-module std_private_algorithm_is_permutation                              [system] { header "__algorithm/is_permutation.h" }
-module std_private_algorithm_is_sorted                                   [system] { header "__algorithm/is_sorted.h" }
-module std_private_algorithm_is_sorted_until                             [system] { header "__algorithm/is_sorted_until.h" }
-module std_private_algorithm_iter_swap                                   [system] { header "__algorithm/iter_swap.h" }
-module std_private_algorithm_iterator_operations                         [system] {
-  header "__algorithm/iterator_operations.h"
-  export *
-}
-module std_private_algorithm_lexicographical_compare                     [system] { header "__algorithm/lexicographical_compare.h" }
-module std_private_algorithm_lexicographical_compare_three_way           [system] { header "__algorithm/lexicographical_compare_three_way.h" }
-module std_private_algorithm_lower_bound                                 [system] { header "__algorithm/lower_bound.h" }
-module std_private_algorithm_make_heap                                   [system] { header "__algorithm/make_heap.h" }
-module std_private_algorithm_make_projected                              [system] { header "__algorithm/make_projected.h" }
-module std_private_algorithm_max                                         [system] { header "__algorithm/max.h" }
-module std_private_algorithm_max_element                                 [system] { header "__algorithm/max_element.h" }
-module std_private_algorithm_merge                                       [system] { header "__algorithm/merge.h" }
-module std_private_algorithm_min                                         [system] { header "__algorithm/min.h" }
-module std_private_algorithm_min_element                                 [system] { header "__algorithm/min_element.h" }
-module std_private_algorithm_min_max_result                              [system] { header "__algorithm/min_max_result.h" }
-module std_private_algorithm_minmax                                      [system] {
-  header "__algorithm/minmax.h"
-  export *
-}
-module std_private_algorithm_minmax_element                              [system] { header "__algorithm/minmax_element.h" }
-module std_private_algorithm_mismatch                                    [system] { header "__algorithm/mismatch.h" }
-module std_private_algorithm_move                                        [system] { header "__algorithm/move.h" }
-module std_private_algorithm_move_backward                               [system] { header "__algorithm/move_backward.h" }
-module std_private_algorithm_next_permutation                            [system] { header "__algorithm/next_permutation.h" }
-module std_private_algorithm_none_of                                     [system] { header "__algorithm/none_of.h" }
-module std_private_algorithm_nth_element                                 [system] { header "__algorithm/nth_element.h" }
-module std_private_algorithm_partial_sort                                [system] { header "__algorithm/partial_sort.h" }
-module std_private_algorithm_partial_sort_copy                           [system] { header "__algorithm/partial_sort_copy.h" }
-module std_private_algorithm_partition                                   [system] { header "__algorithm/partition.h" }
-module std_private_algorithm_partition_copy                              [system] { header "__algorithm/partition_copy.h" }
-module std_private_algorithm_partition_point                             [system] { header "__algorithm/partition_point.h" }
-module std_private_algorithm_pop_heap                                    [system] { header "__algorithm/pop_heap.h" }
-module std_private_algorithm_prev_permutation                            [system] { header "__algorithm/prev_permutation.h" }
-module std_private_algorithm_pstl_any_all_none_of                        [system] { header "__algorithm/pstl_any_all_none_of.h" }
-module std_private_algorithm_pstl_backend                                [system] {
-  header "__algorithm/pstl_backend.h"
-  export *
-}
-module std_private_algorithm_pstl_backends_cpu_backend                   [system] {
-  header "__algorithm/pstl_backends/cpu_backend.h"
-  export *
-}
-module std_private_algorithm_pstl_backends_cpu_backends_any_of           [system] { header "__algorithm/pstl_backends/cpu_backends/any_of.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_backend          [system] {
-  header "__algorithm/pstl_backends/cpu_backends/backend.h"
-  export *
-}
-module std_private_algorithm_pstl_backends_cpu_backends_fill             [system] { header "__algorithm/pstl_backends/cpu_backends/fill.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_find_if          [system] { header "__algorithm/pstl_backends/cpu_backends/find_if.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_for_each         [system] { header "__algorithm/pstl_backends/cpu_backends/for_each.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_libdispatch      [system] { header "__algorithm/pstl_backends/cpu_backends/libdispatch.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_merge            [system] { header "__algorithm/pstl_backends/cpu_backends/merge.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_serial           [system] { textual header "__algorithm/pstl_backends/cpu_backends/serial.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_stable_sort      [system] { header "__algorithm/pstl_backends/cpu_backends/stable_sort.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_thread           [system] { textual header "__algorithm/pstl_backends/cpu_backends/thread.h" }
-module std_private_algorithm_pstl_backends_cpu_backends_transform        [system] {
-  header "__algorithm/pstl_backends/cpu_backends/transform.h"
-  export std_private_algorithm_transform
-}
-module std_private_algorithm_pstl_backends_cpu_backends_transform_reduce [system] { header "__algorithm/pstl_backends/cpu_backends/transform_reduce.h" }
-module std_private_algorithm_pstl_copy                                   [system] { header "__algorithm/pstl_copy.h" }
-module std_private_algorithm_pstl_count                                  [system] { header "__algorithm/pstl_count.h" }
-module std_private_algorithm_pstl_fill                                   [system] { header "__algorithm/pstl_fill.h" }
-module std_private_algorithm_pstl_find                                   [system] {
-  header "__algorithm/pstl_find.h"
-  export *
-}
-module std_private_algorithm_pstl_for_each                               [system] {
-  header "__algorithm/pstl_for_each.h"
-  export *
-}
-module std_private_algorithm_pstl_frontend_dispatch                      [system] {
-  header "__algorithm/pstl_frontend_dispatch.h"
-  export std_private_utility_forward
-}
-module std_private_algorithm_pstl_generate                               [system] { header "__algorithm/pstl_generate.h" }
-module std_private_algorithm_pstl_is_partitioned                         [system] { header "__algorithm/pstl_is_partitioned.h" }
-module std_private_algorithm_pstl_merge                                  [system] { header "__algorithm/pstl_merge.h" }
-module std_private_algorithm_pstl_replace                                [system] { header "__algorithm/pstl_replace.h" }
-module std_private_algorithm_pstl_stable_sort                            [system] {
-  header "__algorithm/pstl_stable_sort.h"
-  export std_private_functional_operations
-}
-module std_private_algorithm_pstl_transform                              [system] { header "__algorithm/pstl_transform.h" }
-module std_private_algorithm_push_heap                                   [system] { header "__algorithm/push_heap.h" }
-module std_private_algorithm_ranges_adjacent_find                        [system] { header "__algorithm/ranges_adjacent_find.h" }
-module std_private_algorithm_ranges_all_of                               [system] { header "__algorithm/ranges_all_of.h" }
-module std_private_algorithm_ranges_any_of                               [system] { header "__algorithm/ranges_any_of.h" }
-module std_private_algorithm_ranges_binary_search                        [system] {
-  header "__algorithm/ranges_binary_search.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_clamp                                [system] {
-  header "__algorithm/ranges_clamp.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_copy                                 [system] {
-  header "__algorithm/ranges_copy.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_copy_backward                        [system] {
-  header "__algorithm/ranges_copy_backward.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_copy_if                              [system] {
-  header "__algorithm/ranges_copy_if.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_copy_n                               [system] {
-  header "__algorithm/ranges_copy_n.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_count                                [system] { header "__algorithm/ranges_count.h" }
-module std_private_algorithm_ranges_count_if                             [system] { header "__algorithm/ranges_count_if.h" }
-module std_private_algorithm_ranges_equal                                [system] { header "__algorithm/ranges_equal.h" }
-module std_private_algorithm_ranges_equal_range                          [system] {
-  header "__algorithm/ranges_equal_range.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_fill                                 [system] { header "__algorithm/ranges_fill.h" }
-module std_private_algorithm_ranges_fill_n                               [system] { header "__algorithm/ranges_fill_n.h" }
-module std_private_algorithm_ranges_find                                 [system] { header "__algorithm/ranges_find.h" }
-module std_private_algorithm_ranges_find_end                             [system] { header "__algorithm/ranges_find_end.h" }
-module std_private_algorithm_ranges_find_first_of                        [system] { header "__algorithm/ranges_find_first_of.h" }
-module std_private_algorithm_ranges_find_if                              [system] { header "__algorithm/ranges_find_if.h" }
-module std_private_algorithm_ranges_find_if_not                          [system] { header "__algorithm/ranges_find_if_not.h" }
-module std_private_algorithm_ranges_for_each                             [system] {
-  header "__algorithm/ranges_for_each.h"
-  export std_private_algorithm_in_fun_result
-}
-module std_private_algorithm_ranges_for_each_n                           [system] {
-  header "__algorithm/ranges_for_each_n.h"
-  export std_private_algorithm_in_fun_result
-}
-module std_private_algorithm_ranges_generate                             [system] { header "__algorithm/ranges_generate.h" }
-module std_private_algorithm_ranges_generate_n                           [system] { header "__algorithm/ranges_generate_n.h" }
-module std_private_algorithm_ranges_includes                             [system] {
-  header "__algorithm/ranges_includes.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_inplace_merge                        [system] {
-  header "__algorithm/ranges_inplace_merge.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_is_heap                              [system] {
-  header "__algorithm/ranges_is_heap.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_is_heap_until                        [system] {
-  header "__algorithm/ranges_is_heap_until.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_is_partitioned                       [system] { header "__algorithm/ranges_is_partitioned.h" }
-module std_private_algorithm_ranges_is_permutation                       [system] { header "__algorithm/ranges_is_permutation.h" }
-module std_private_algorithm_ranges_is_sorted                            [system] {
-  header "__algorithm/ranges_is_sorted.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_is_sorted_until                      [system] {
-  header "__algorithm/ranges_is_sorted_until.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_iterator_concept                     [system] { header "__algorithm/ranges_iterator_concept.h" }
-module std_private_algorithm_ranges_lexicographical_compare              [system] {
-  header "__algorithm/ranges_lexicographical_compare.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_lower_bound                          [system] {
-  header "__algorithm/ranges_lower_bound.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_make_heap                            [system] {
-  header "__algorithm/ranges_make_heap.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_max                                  [system] {
-  header "__algorithm/ranges_max.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_max_element                          [system] {
-  header "__algorithm/ranges_max_element.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_merge                                [system] {
-  header "__algorithm/ranges_merge.h"
-  export std_private_algorithm_in_in_out_result
-}
-module std_private_algorithm_ranges_min                                  [system] {
-  header "__algorithm/ranges_min.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_min_element                          [system] {
-  header "__algorithm/ranges_min_element.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_minmax                               [system] {
-  header "__algorithm/ranges_minmax.h"
-  export std_private_functional_ranges_operations
-  export std_private_algorithm_min_max_result
-}
-module std_private_algorithm_ranges_minmax_element                       [system] {
-  header "__algorithm/ranges_minmax_element.h"
-  export std_private_functional_ranges_operations
-  export std_private_algorithm_min_max_result
-}
-module std_private_algorithm_ranges_mismatch                             [system] {
-  header "__algorithm/ranges_mismatch.h"
-  export std_private_algorithm_in_in_result
-}
-module std_private_algorithm_ranges_move                                 [system] {
-  header "__algorithm/ranges_move.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_move_backward                        [system] {
-  header "__algorithm/ranges_move_backward.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_next_permutation                     [system] {
-  header "__algorithm/ranges_next_permutation.h"
-  export std_private_algorithm_in_found_result
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_none_of                              [system] { header "__algorithm/ranges_none_of.h" }
-module std_private_algorithm_ranges_nth_element                          [system] {
-  header "__algorithm/ranges_nth_element.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_partial_sort                         [system] {
-  header "__algorithm/ranges_partial_sort.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_partial_sort_copy                    [system] {
-  header "__algorithm/ranges_partial_sort_copy.h"
-  export std_private_algorithm_in_out_result
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_partition                            [system] { header "__algorithm/ranges_partition.h" }
-module std_private_algorithm_ranges_partition_copy                       [system] { header "__algorithm/ranges_partition_copy.h" }
-module std_private_algorithm_ranges_partition_point                      [system] { header "__algorithm/ranges_partition_point.h" }
-module std_private_algorithm_ranges_pop_heap                             [system] {
-  header "__algorithm/ranges_pop_heap.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_prev_permutation                     [system] {
-  header "__algorithm/ranges_prev_permutation.h"
-  export std_private_algorithm_in_found_result
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_push_heap                            [system] {
-  header "__algorithm/ranges_push_heap.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_remove                               [system] { header "__algorithm/ranges_remove.h" }
-module std_private_algorithm_ranges_remove_copy                          [system] {
-  header "__algorithm/ranges_remove_copy.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_remove_copy_if                       [system] {
-  header "__algorithm/ranges_remove_copy_if.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_remove_if                            [system] { header "__algorithm/ranges_remove_if.h" }
-module std_private_algorithm_ranges_replace                              [system] { header "__algorithm/ranges_replace.h" }
-module std_private_algorithm_ranges_replace_copy                         [system] {
-  header "__algorithm/ranges_replace_copy.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_replace_copy_if                      [system] {
-  header "__algorithm/ranges_replace_copy_if.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_replace_if                           [system] { header "__algorithm/ranges_replace_if.h" }
-module std_private_algorithm_ranges_reverse                              [system] { header "__algorithm/ranges_reverse.h" }
-module std_private_algorithm_ranges_reverse_copy                         [system] {
-  header "__algorithm/ranges_reverse_copy.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_rotate                               [system] { header "__algorithm/ranges_rotate.h" }
-module std_private_algorithm_ranges_rotate_copy                          [system] {
-  header "__algorithm/ranges_rotate_copy.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_sample                               [system] { header "__algorithm/ranges_sample.h" }
-module std_private_algorithm_ranges_search                               [system] { header "__algorithm/ranges_search.h" }
-module std_private_algorithm_ranges_search_n                             [system] { header "__algorithm/ranges_search_n.h" }
-module std_private_algorithm_ranges_set_difference                       [system] {
-  header "__algorithm/ranges_set_difference.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_set_intersection                     [system] {
-  header "__algorithm/ranges_set_intersection.h"
-  export std_private_algorithm_in_in_out_result
-}
-module std_private_algorithm_ranges_set_symmetric_difference             [system] {
-  header "__algorithm/ranges_set_symmetric_difference.h"
-  export std_private_algorithm_in_in_out_result
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_set_union                            [system] {
-  header "__algorithm/ranges_set_union.h"
-  export std_private_algorithm_in_in_out_result
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_shuffle                              [system] { header "__algorithm/ranges_shuffle.h" }
-module std_private_algorithm_ranges_sort                                 [system] {
-  header "__algorithm/ranges_sort.h"
-  export std_private_algorithm_make_projected
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_sort_heap                            [system] {
-  header "__algorithm/ranges_sort_heap.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_stable_partition                     [system] { header "__algorithm/ranges_stable_partition.h" }
-module std_private_algorithm_ranges_stable_sort                          [system] {
-  header "__algorithm/ranges_stable_sort.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_ranges_starts_with                          [system] { header "__algorithm/ranges_starts_with.h" }
-module std_private_algorithm_ranges_swap_ranges                          [system] {
-  header "__algorithm/ranges_swap_ranges.h"
-  export std_private_algorithm_in_in_result
-}
-module std_private_algorithm_ranges_transform                            [system] {
-  header "__algorithm/ranges_transform.h"
-  export std_private_algorithm_in_in_out_result
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_unique                               [system] { header "__algorithm/ranges_unique.h" }
-module std_private_algorithm_ranges_unique_copy                          [system] {
-  header "__algorithm/ranges_unique_copy.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_algorithm_ranges_upper_bound                          [system] {
-  header "__algorithm/ranges_upper_bound.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_algorithm_remove                                      [system] { header "__algorithm/remove.h" }
-module std_private_algorithm_remove_copy                                 [system] { header "__algorithm/remove_copy.h" }
-module std_private_algorithm_remove_copy_if                              [system] { header "__algorithm/remove_copy_if.h" }
-module std_private_algorithm_remove_if                                   [system] { header "__algorithm/remove_if.h" }
-module std_private_algorithm_replace                                     [system] { header "__algorithm/replace.h" }
-module std_private_algorithm_replace_copy                                [system] { header "__algorithm/replace_copy.h" }
-module std_private_algorithm_replace_copy_if                             [system] { header "__algorithm/replace_copy_if.h" }
-module std_private_algorithm_replace_if                                  [system] { header "__algorithm/replace_if.h" }
-module std_private_algorithm_reverse                                     [system] { header "__algorithm/reverse.h" }
-module std_private_algorithm_reverse_copy                                [system] { header "__algorithm/reverse_copy.h" }
-module std_private_algorithm_rotate                                      [system] { header "__algorithm/rotate.h" }
-module std_private_algorithm_rotate_copy                                 [system] { header "__algorithm/rotate_copy.h" }
-module std_private_algorithm_sample                                      [system] { header "__algorithm/sample.h" }
-module std_private_algorithm_search                                      [system] { header "__algorithm/search.h" }
-module std_private_algorithm_search_n                                    [system] { header "__algorithm/search_n.h" }
-module std_private_algorithm_set_difference                              [system] { header "__algorithm/set_difference.h" }
-module std_private_algorithm_set_intersection                            [system] { header "__algorithm/set_intersection.h" }
-module std_private_algorithm_set_symmetric_difference                    [system] { header "__algorithm/set_symmetric_difference.h" }
-module std_private_algorithm_set_union                                   [system] { header "__algorithm/set_union.h" }
-module std_private_algorithm_shift_left                                  [system] { header "__algorithm/shift_left.h" }
-module std_private_algorithm_shift_right                                 [system] { header "__algorithm/shift_right.h" }
-module std_private_algorithm_shuffle                                     [system] { header "__algorithm/shuffle.h" }
-module std_private_algorithm_sift_down                                   [system] { header "__algorithm/sift_down.h" }
-module std_private_algorithm_sort                                        [system] {
-  header "__algorithm/sort.h"
-  export std_private_debug_utils_strict_weak_ordering_check
-}
-module std_private_algorithm_sort_heap                                   [system] { header "__algorithm/sort_heap.h" }
-module std_private_algorithm_stable_partition                            [system] { header "__algorithm/stable_partition.h" }
-module std_private_algorithm_stable_sort                                 [system] { header "__algorithm/stable_sort.h" }
-module std_private_algorithm_swap_ranges                                 [system] {
-  header "__algorithm/swap_ranges.h"
-  export std_private_algorithm_iterator_operations
-}
-module std_private_algorithm_three_way_comp_ref_type                     [system] { header "__algorithm/three_way_comp_ref_type.h" }
-module std_private_algorithm_transform                                   [system] { header "__algorithm/transform.h" }
-module std_private_algorithm_uniform_random_bit_generator_adaptor        [system] { header "__algorithm/uniform_random_bit_generator_adaptor.h" }
-module std_private_algorithm_unique                                      [system] { header "__algorithm/unique.h" }
-module std_private_algorithm_unique_copy                                 [system] { header "__algorithm/unique_copy.h" }
-module std_private_algorithm_unwrap_iter                                 [system] {
-  header "__algorithm/unwrap_iter.h"
-  export std_private_iterator_iterator_traits
-}
-module std_private_algorithm_unwrap_range                                [system] {
-  header "__algorithm/unwrap_range.h"
-  export std_private_utility_pair
-}
-module std_private_algorithm_upper_bound                                 [system] { header "__algorithm/upper_bound.h" }
-
-module std_private_array_array_fwd [system] { header "__fwd/array.h" }
-
-module std_private_atomic_aliases             [system] {
-  header "__atomic/aliases.h"
-  export std_private_atomic_atomic
-}
-module std_private_atomic_atomic              [system] {
-  header "__atomic/atomic.h"
-  export std_private_atomic_atomic_base
-}
-module std_private_atomic_atomic_base         [system] { header "__atomic/atomic_base.h" }
-module std_private_atomic_atomic_flag         [system] {
-  header "__atomic/atomic_flag.h"
-  export *
-}
-module std_private_atomic_atomic_init         [system] { header "__atomic/atomic_init.h" }
-module std_private_atomic_atomic_lock_free    [system] { header "__atomic/atomic_lock_free.h" }
-module std_private_atomic_atomic_sync         [system] { header "__atomic/atomic_sync.h" }
-module std_private_atomic_check_memory_order  [system] { header "__atomic/check_memory_order.h" }
-module std_private_atomic_contention_t        [system] { header "__atomic/contention_t.h" }
-module std_private_atomic_cxx_atomic_impl     [system] { header "__atomic/cxx_atomic_impl.h" }
-module std_private_atomic_fence               [system] { header "__atomic/fence.h" }
-module std_private_atomic_is_always_lock_free [system] { header "__atomic/is_always_lock_free.h" }
-module std_private_atomic_kill_dependency     [system] { header "__atomic/kill_dependency.h" }
-module std_private_atomic_memory_order        [system] { header "__atomic/memory_order.h" }
-
-module std_private_bit_bit_cast       [system] { header "__bit/bit_cast.h" }
-module std_private_bit_bit_ceil       [system] { header "__bit/bit_ceil.h" }
-module std_private_bit_bit_floor      [system] { header "__bit/bit_floor.h" }
-module std_private_bit_bit_log2       [system] { header "__bit/bit_log2.h" }
-module std_private_bit_bit_width      [system] { header "__bit/bit_width.h" }
-module std_private_bit_blsr           [system] { header "__bit/blsr.h" }
-module std_private_bit_byteswap       [system] { header "__bit/byteswap.h" }
-module std_private_bit_countl         [system] { header "__bit/countl.h" }
-module std_private_bit_countr         [system] { header "__bit/countr.h" }
-module std_private_bit_endian         [system] { header "__bit/endian.h" }
-module std_private_bit_has_single_bit [system] { header "__bit/has_single_bit.h" }
-module std_private_bit_popcount       [system] { header "__bit/popcount.h" }
-module std_private_bit_rotate         [system] { header "__bit/rotate.h" }
-
-module std_private_charconv_chars_format            [system] { header "__charconv/chars_format.h" }
-module std_private_charconv_from_chars_integral     [system] { header "__charconv/from_chars_integral.h" }
-module std_private_charconv_from_chars_result       [system] { header "__charconv/from_chars_result.h" }
-module std_private_charconv_tables                  [system] { header "__charconv/tables.h" }
-module std_private_charconv_to_chars                [system] { header "__charconv/to_chars.h" }
-module std_private_charconv_to_chars_base_10        [system] { header "__charconv/to_chars_base_10.h" }
-module std_private_charconv_to_chars_floating_point [system] { header "__charconv/to_chars_floating_point.h" }
-module std_private_charconv_to_chars_integral       [system] { header "__charconv/to_chars_integral.h" }
-module std_private_charconv_to_chars_result         [system] { header "__charconv/to_chars_result.h" }
-module std_private_charconv_traits                  [system] { header "__charconv/traits.h" }
-
-module std_private_chrono_calendar               [system] { header "__chrono/calendar.h" }
-module std_private_chrono_concepts               [system] { header "__chrono/concepts.h" }
-module std_private_chrono_convert_to_timespec    [system] { header "__chrono/convert_to_timespec.h" }
-module std_private_chrono_convert_to_tm          [system] { header "__chrono/convert_to_tm.h" }
-module std_private_chrono_day                    [system] { header "__chrono/day.h" }
-module std_private_chrono_duration               [system] {
-  header "__chrono/duration.h"
-  export std_private_type_traits_is_convertible
-}
-module std_private_chrono_file_clock             [system] { header "__chrono/file_clock.h" }
-module std_private_chrono_formatter              [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__chrono/formatter.h"
-}
-module std_private_chrono_hh_mm_ss               [system] { header "__chrono/hh_mm_ss.h" }
-module std_private_chrono_high_resolution_clock  [system] {
-  header "__chrono/high_resolution_clock.h"
-  export std_private_chrono_steady_clock
-  export std_private_chrono_system_clock
-}
-module std_private_chrono_literals               [system] { header "__chrono/literals.h" }
-module std_private_chrono_month                  [system] { header "__chrono/month.h" }
-module std_private_chrono_month_weekday          [system] { header "__chrono/month_weekday.h" }
-module std_private_chrono_monthday               [system] { header "__chrono/monthday.h" }
-module std_private_chrono_ostream                [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__chrono/ostream.h"
-}
-module std_private_chrono_parser_std_format_spec [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__chrono/parser_std_format_spec.h"
-}
-module std_private_chrono_statically_widen       [system] { header "__chrono/statically_widen.h" }
-module std_private_chrono_steady_clock           [system] {
-  header "__chrono/steady_clock.h"
-  export std_private_chrono_time_point
-}
-module std_private_chrono_system_clock           [system] {
-  header "__chrono/system_clock.h"
-  export std_private_chrono_time_point
-}
-module std_private_chrono_time_point             [system] { header "__chrono/time_point.h" }
-module std_private_chrono_weekday                [system] { header "__chrono/weekday.h" }
-module std_private_chrono_year                   [system] { header "__chrono/year.h" }
-module std_private_chrono_year_month             [system] { header "__chrono/year_month.h" }
-module std_private_chrono_year_month_day         [system] { header "__chrono/year_month_day.h" }
-module std_private_chrono_year_month_weekday     [system] { header "__chrono/year_month_weekday.h" }
-
-module std_private_compare_common_comparison_category     [system] { header "__compare/common_comparison_category.h" }
-module std_private_compare_compare_partial_order_fallback [system] { header "__compare/compare_partial_order_fallback.h" }
-module std_private_compare_compare_strong_order_fallback  [system] { header "__compare/compare_strong_order_fallback.h" }
-module std_private_compare_compare_three_way              [system] { header "__compare/compare_three_way.h" }
-module std_private_compare_compare_three_way_result       [system] { header "__compare/compare_three_way_result.h" }
-module std_private_compare_compare_weak_order_fallback    [system] { header "__compare/compare_weak_order_fallback.h" }
-module std_private_compare_is_eq                          [system] { header "__compare/is_eq.h" }
-module std_private_compare_ordering                       [system] { header "__compare/ordering.h" }
-module std_private_compare_partial_order                  [system] { header "__compare/partial_order.h" }
-module std_private_compare_strong_order                   [system] { header "__compare/strong_order.h" }
-module std_private_compare_synth_three_way                [system] { header "__compare/synth_three_way.h" }
-module std_private_compare_three_way_comparable           [system] { header "__compare/three_way_comparable.h" }
-module std_private_compare_weak_order                     [system] { header "__compare/weak_order.h" }
-
-module std_private_concepts_arithmetic            [system] { header "__concepts/arithmetic.h" }
-module std_private_concepts_assignable            [system] { header "__concepts/assignable.h" }
-module std_private_concepts_boolean_testable      [system] { header "__concepts/boolean_testable.h" }
-module std_private_concepts_class_or_enum         [system] { header "__concepts/class_or_enum.h" }
-module std_private_concepts_common_reference_with [system] { header "__concepts/common_reference_with.h" }
-module std_private_concepts_common_with           [system] { header "__concepts/common_with.h" }
-module std_private_concepts_constructible         [system] {
-  header "__concepts/constructible.h"
-  export std_private_concepts_destructible
-}
-module std_private_concepts_convertible_to        [system] { header "__concepts/convertible_to.h" }
-module std_private_concepts_copyable              [system] { header "__concepts/copyable.h" }
-module std_private_concepts_derived_from          [system] { header "__concepts/derived_from.h" }
-module std_private_concepts_destructible          [system] {
-  header "__concepts/destructible.h"
-  export std_private_type_traits_is_nothrow_destructible
-}
-module std_private_concepts_different_from        [system] { header "__concepts/different_from.h" }
-module std_private_concepts_equality_comparable   [system] {
-  header "__concepts/equality_comparable.h"
-  export std_private_type_traits_common_reference
-}
-module std_private_concepts_invocable             [system] { header "__concepts/invocable.h" }
-module std_private_concepts_movable               [system] {
-  header "__concepts/movable.h"
-  export std_private_type_traits_is_object
-}
-module std_private_concepts_predicate             [system] { header "__concepts/predicate.h" }
-module std_private_concepts_regular               [system] { header "__concepts/regular.h" }
-module std_private_concepts_relation              [system] { header "__concepts/relation.h" }
-module std_private_concepts_same_as               [system] {
-  header "__concepts/same_as.h"
-  export std_private_type_traits_is_same
-}
-module std_private_concepts_semiregular           [system] { header "__concepts/semiregular.h" }
-module std_private_concepts_swappable             [system] { header "__concepts/swappable.h" }
-module std_private_concepts_totally_ordered       [system] { header "__concepts/totally_ordered.h" }
-
-module std_private_condition_variable_condition_variable [system] {
-  header "__condition_variable/condition_variable.h"
-  export *
-}
-
-module std_private_coroutine_coroutine_handle      [system] { header "__coroutine/coroutine_handle.h" }
-module std_private_coroutine_coroutine_traits      [system] { header "__coroutine/coroutine_traits.h" }
-module std_private_coroutine_noop_coroutine_handle [system] { header "__coroutine/noop_coroutine_handle.h" }
-module std_private_coroutine_trivial_awaitables    [system] { header "__coroutine/trivial_awaitables.h" }
-
-module std_private_debug_utils_randomize_range            [system] { header "__debug_utils/randomize_range.h" }
-module std_private_debug_utils_strict_weak_ordering_check [system] {
-  header "__debug_utils/strict_weak_ordering_check.h"
-  export std_private_type_traits_is_constant_evaluated
-}
-
-module std_private_exception_exception        [system] { header "__exception/exception.h" }
-module std_private_exception_exception_ptr    [system] {
-  header "__exception/exception_ptr.h"
-  export std_private_exception_operations
-}
-module std_private_exception_nested_exception [system] { header "__exception/nested_exception.h" }
-module std_private_exception_operations       [system] { header "__exception/operations.h" }
-module std_private_exception_terminate        [system] { header "__exception/terminate.h" }
-
-module std_private_expected_bad_expected_access [system] { header "__expected/bad_expected_access.h" }
-module std_private_expected_expected            [system] { header "__expected/expected.h" }
-module std_private_expected_unexpect            [system] { header "__expected/unexpect.h" }
-module std_private_expected_unexpected          [system] { header "__expected/unexpected.h" }
-
-module std_private_filesystem_copy_options                 [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/copy_options.h"
-}
-module std_private_filesystem_directory_entry              [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/directory_entry.h"
-  export *
-}
-module std_private_filesystem_directory_iterator           [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/directory_iterator.h"
-  export *
-}
-module std_private_filesystem_directory_options            [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/directory_options.h"
-}
-module std_private_filesystem_file_status                  [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/file_status.h"
-}
-module std_private_filesystem_file_time_type               [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/file_time_type.h"
-}
-module std_private_filesystem_file_type                    [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/file_type.h"
-}
-module std_private_filesystem_filesystem_error             [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/filesystem_error.h"
-  export *
-}
-module std_private_filesystem_operations                   [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/operations.h"
-}
-module std_private_filesystem_path                         [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/path.h"
-  export *
-}
-module std_private_filesystem_path_iterator                [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/path_iterator.h"
-}
-module std_private_filesystem_perm_options                 [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/perm_options.h"
-}
-module std_private_filesystem_perms                        [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/perms.h"
-}
-module std_private_filesystem_recursive_directory_iterator [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/recursive_directory_iterator.h"
-  export *
-}
-module std_private_filesystem_space_info                   [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/space_info.h"
-}
-module std_private_filesystem_u8path                       [system] {
-  @requires_LIBCXX_ENABLE_FILESYSTEM@
-  header "__filesystem/u8path.h"
-}
-
-module std_private_format_buffer                          [system] { header "__format/buffer.h" }
-module std_private_format_concepts                        [system] { header "__format/concepts.h" }
-module std_private_format_container_adaptor               [system] { header "__format/container_adaptor.h" }
-module std_private_format_enable_insertable               [system] { header "__format/enable_insertable.h" }
-module std_private_format_escaped_output_table            [system] { header "__format/escaped_output_table.h" }
-module std_private_format_extended_grapheme_cluster_table [system] { header "__format/extended_grapheme_cluster_table.h" }
-module std_private_format_format_arg                      [system] { header "__format/format_arg.h" }
-module std_private_format_format_arg_store                [system] { header "__format/format_arg_store.h" }
-module std_private_format_format_args                     [system] { header "__format/format_args.h" }
-module std_private_format_format_context                  [system] {
-  header "__format/format_context.h"
-  export *
-}
-module std_private_format_format_error                    [system] { header "__format/format_error.h" }
-module std_private_format_format_functions                [system] { header "__format/format_functions.h" }
-module std_private_format_format_fwd                      [system] { header "__format/format_fwd.h" }
-module std_private_format_format_parse_context            [system] { header "__format/format_parse_context.h" }
-module std_private_format_format_string                   [system] { header "__format/format_string.h" }
-module std_private_format_format_to_n_result              [system] {
-  header "__format/format_to_n_result.h"
-  export std_private_iterator_incrementable_traits
-}
-module std_private_format_formatter                       [system] { header "__format/formatter.h" }
-module std_private_format_formatter_bool                  [system] { header "__format/formatter_bool.h" }
-module std_private_format_formatter_char                  [system] { header "__format/formatter_char.h" }
-module std_private_format_formatter_floating_point        [system] { header "__format/formatter_floating_point.h" }
-module std_private_format_formatter_integer               [system] { header "__format/formatter_integer.h" }
-module std_private_format_formatter_integral              [system] { header "__format/formatter_integral.h" }
-module std_private_format_formatter_output                [system] { header "__format/formatter_output.h" }
-module std_private_format_formatter_pointer               [system] { header "__format/formatter_pointer.h" }
-module std_private_format_formatter_string                [system] { header "__format/formatter_string.h" }
-module std_private_format_formatter_tuple                 [system] { header "__format/formatter_tuple.h" }
-module std_private_format_parser_std_format_spec          [system] { header "__format/parser_std_format_spec.h" }
-module std_private_format_range_default_formatter         [system] { header "__format/range_default_formatter.h" }
-module std_private_format_range_formatter                 [system] { header "__format/range_formatter.h" }
-module std_private_format_unicode                         [system] {
-  header "__format/unicode.h"
-  export std_private_format_extended_grapheme_cluster_table
-}
-module std_private_format_width_estimation_table          [system] { header "__format/width_estimation_table.h" }
-module std_private_format_write_escaped                   [system] { header "__format/write_escaped.h" }
-
-module std_private_functional_binary_function            [system] { header "__functional/binary_function.h" }
-module std_private_functional_binary_negate              [system] { header "__functional/binary_negate.h" }
-module std_private_functional_bind                       [system] { header "__functional/bind.h" }
-module std_private_functional_bind_back                  [system] { header "__functional/bind_back.h" }
-module std_private_functional_bind_front                 [system] { header "__functional/bind_front.h" }
-module std_private_functional_binder1st                  [system] { header "__functional/binder1st.h" }
-module std_private_functional_binder2nd                  [system] { header "__functional/binder2nd.h" }
-module std_private_functional_boyer_moore_searcher       [system] {
-  header "__functional/boyer_moore_searcher.h"
-  export std_private_memory_shared_ptr
-}
-module std_private_functional_compose                    [system] {
-  header "__functional/compose.h"
-  export std_private_functional_perfect_forward
-}
-module std_private_functional_default_searcher           [system] { header "__functional/default_searcher.h" }
-module std_private_functional_function                   [system] { header "__functional/function.h" }
-module std_private_functional_hash                       [system] {
-  header "__functional/hash.h"
-  export std_cstdint
-  export std_private_type_traits_underlying_type
-  export std_private_utility_pair
-}
-module std_private_functional_hash_fwd                   [system] { header "__fwd/hash.h" }
-module std_private_functional_identity                   [system] { header "__functional/identity.h" }
-module std_private_functional_invoke                     [system] {
-  header "__functional/invoke.h"
-  export *
-}
-module std_private_functional_is_transparent             [system] { header "__functional/is_transparent.h" }
-module std_private_functional_mem_fn                     [system] { header "__functional/mem_fn.h" }
-module std_private_functional_mem_fun_ref                [system] { header "__functional/mem_fun_ref.h" }
-module std_private_functional_not_fn                     [system] { header "__functional/not_fn.h" }
-module std_private_functional_operations                 [system] { header "__functional/operations.h" }
-module std_private_functional_perfect_forward            [system] {
-  header "__functional/perfect_forward.h"
-  export *
-}
-module std_private_functional_pointer_to_binary_function [system] { header "__functional/pointer_to_binary_function.h" }
-module std_private_functional_pointer_to_unary_function  [system] { header "__functional/pointer_to_unary_function.h" }
-module std_private_functional_ranges_operations          [system] { header "__functional/ranges_operations.h" }
-module std_private_functional_reference_wrapper          [system] { header "__functional/reference_wrapper.h" }
-module std_private_functional_unary_function             [system] { header "__functional/unary_function.h" }
-module std_private_functional_unary_negate               [system] { header "__functional/unary_negate.h" }
-module std_private_functional_weak_result_type           [system] { header "__functional/weak_result_type.h" }
-
-module std_private_ios_fpos [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__ios/fpos.h"
-}
-
-module std_private_iosfwd_fstream_fwd   [system] { header "__fwd/fstream.h" }
-module std_private_iosfwd_ios_fwd       [system] { header "__fwd/ios.h" }
-module std_private_iosfwd_istream_fwd   [system] { header "__fwd/istream.h" }
-module std_private_iosfwd_ostream_fwd   [system] { header "__fwd/ostream.h" }
-module std_private_iosfwd_sstream_fwd   [system] { header "__fwd/sstream.h" }
-module std_private_iosfwd_streambuf_fwd [system] { header "__fwd/streambuf.h" }
-
-module std_private_iterator_access                  [system] { header "__iterator/access.h" }
-module std_private_iterator_advance                 [system] { header "__iterator/advance.h" }
-module std_private_iterator_back_insert_iterator    [system] { header "__iterator/back_insert_iterator.h" }
-module std_private_iterator_bounded_iter            [system] { header "__iterator/bounded_iter.h" }
-module std_private_iterator_common_iterator         [system] { header "__iterator/common_iterator.h" }
-module std_private_iterator_concepts                [system] {
-  header "__iterator/concepts.h"
-  export std_private_concepts_constructible
-  export std_private_concepts_equality_comparable
-  export std_private_concepts_movable
-  export std_private_type_traits_common_reference
-  export std_private_type_traits_is_reference
-  export std_private_type_traits_remove_cvref
-}
-module std_private_iterator_counted_iterator        [system] { header "__iterator/counted_iterator.h" }
-module std_private_iterator_cpp17_iterator_concepts [system] { header "__iterator/cpp17_iterator_concepts.h" }
-module std_private_iterator_data                    [system] { header "__iterator/data.h" }
-module std_private_iterator_default_sentinel        [system] { header "__iterator/default_sentinel.h" }
-module std_private_iterator_distance                [system] {
-  header "__iterator/distance.h"
-  export std_private_ranges_size
-}
-module std_private_iterator_empty                   [system] { header "__iterator/empty.h" }
-module std_private_iterator_erase_if_container      [system] { header "__iterator/erase_if_container.h" }
-module std_private_iterator_front_insert_iterator   [system] { header "__iterator/front_insert_iterator.h" }
-module std_private_iterator_incrementable_traits    [system] { header "__iterator/incrementable_traits.h" }
-module std_private_iterator_indirectly_comparable   [system] { header "__iterator/indirectly_comparable.h" }
-module std_private_iterator_insert_iterator         [system] { header "__iterator/insert_iterator.h" }
-module std_private_iterator_istream_iterator        [system] { header "__iterator/istream_iterator.h" }
-module std_private_iterator_istreambuf_iterator     [system] { header "__iterator/istreambuf_iterator.h" }
-module std_private_iterator_iter_move               [system] { header "__iterator/iter_move.h" }
-module std_private_iterator_iter_swap               [system] { header "__iterator/iter_swap.h" }
-module std_private_iterator_iterator                [system] { header "__iterator/iterator.h" }
-module std_private_iterator_iterator_traits         [system] {
-  header "__iterator/iterator_traits.h"
-  export std_private_type_traits_is_primary_template
-}
-module std_private_iterator_iterator_with_data      [system] { header "__iterator/iterator_with_data.h" }
-module std_private_iterator_mergeable               [system] {
-  header "__iterator/mergeable.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_iterator_move_iterator           [system] { header "__iterator/move_iterator.h" }
-module std_private_iterator_move_sentinel           [system] { header "__iterator/move_sentinel.h" }
-module std_private_iterator_next                    [system] { header "__iterator/next.h" }
-module std_private_iterator_ostream_iterator        [system] { header "__iterator/ostream_iterator.h" }
-module std_private_iterator_ostreambuf_iterator     [system] {
-  header "__iterator/ostreambuf_iterator.h"
-  export *
-}
-module std_private_iterator_permutable              [system] { header "__iterator/permutable.h" }
-module std_private_iterator_prev                    [system] { header "__iterator/prev.h" }
-module std_private_iterator_projected               [system] { header "__iterator/projected.h" }
-module std_private_iterator_readable_traits         [system] { header "__iterator/readable_traits.h" }
-module std_private_iterator_reverse_access          [system] { header "__iterator/reverse_access.h" }
-module std_private_iterator_reverse_iterator        [system] { header "__iterator/reverse_iterator.h" }
-module std_private_iterator_segmented_iterator      [system] { header "__iterator/segmented_iterator.h" }
-module std_private_iterator_size                    [system] { header "__iterator/size.h" }
-module std_private_iterator_sortable                [system] {
-  header "__iterator/sortable.h"
-  export std_private_functional_ranges_operations
-}
-module std_private_iterator_unreachable_sentinel    [system] { header "__iterator/unreachable_sentinel.h" }
-module std_private_iterator_wrap_iter               [system] { header "__iterator/wrap_iter.h" }
-
-module std_private_locale_locale_base_api_bsd_locale_defaults  [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  textual header "__locale_dir/locale_base_api/bsd_locale_defaults.h"
-}
-module std_private_locale_locale_base_api_bsd_locale_fallbacks [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  textual header "__locale_dir/locale_base_api/bsd_locale_fallbacks.h"
-}
-module std_private_locale_locale_base_api_locale_guard         [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__locale_dir/locale_base_api/locale_guard.h"
-}
-
-module std_private_mdspan_extents      [system] {
-  header "__mdspan/extents.h"
-  export *
-}
-module std_private_mdspan_layout_left  [system] { header "__mdspan/layout_left.h" }
-module std_private_mdspan_layout_right [system] { header "__mdspan/layout_right.h" }
-module std_private_mdspan_mdspan_fwd   [system] { header "__fwd/mdspan.h" }
-
-module std_private_memory_addressof                       [system] { header "__memory/addressof.h" }
-module std_private_memory_align                           [system] { header "__memory/align.h" }
-module std_private_memory_aligned_alloc                   [system] { header "__memory/aligned_alloc.h" }
-module std_private_memory_allocate_at_least               [system] { header "__memory/allocate_at_least.h" }
-module std_private_memory_allocation_guard                [system] { header "__memory/allocation_guard.h" }
-module std_private_memory_allocator                       [system] { header "__memory/allocator.h" }
-module std_private_memory_allocator_arg_t                 [system] { header "__memory/allocator_arg_t.h" }
-module std_private_memory_allocator_destructor            [system] { header "__memory/allocator_destructor.h" }
-module std_private_memory_allocator_traits                [system] { header "__memory/allocator_traits.h" }
-module std_private_memory_assume_aligned                  [system] { header "__memory/assume_aligned.h" }
-module std_private_memory_auto_ptr                        [system] { header "__memory/auto_ptr.h" }
-module std_private_memory_builtin_new_allocator           [system] { header "__memory/builtin_new_allocator.h" }
-module std_private_memory_compressed_pair                 [system] { header "__memory/compressed_pair.h" }
-module std_private_memory_concepts                        [system] {
-  header "__memory/concepts.h"
-  export std_private_type_traits_remove_reference
-}
-module std_private_memory_construct_at                    [system] { header "__memory/construct_at.h" }
-module std_private_memory_destruct_n                      [system] { header "__memory/destruct_n.h" }
-module std_private_memory_pointer_traits                  [system] { header "__memory/pointer_traits.h" }
-module std_private_memory_ranges_construct_at             [system] { header "__memory/ranges_construct_at.h" }
-module std_private_memory_ranges_uninitialized_algorithms [system] {
-  header "__memory/ranges_uninitialized_algorithms.h"
-  export std_private_algorithm_in_out_result
-}
-module std_private_memory_raw_storage_iterator            [system] { header "__memory/raw_storage_iterator.h" }
-module std_private_memory_shared_ptr                      [system] {
-  header "__memory/shared_ptr.h"
-  export std_private_memory_uninitialized_algorithms
-}
-module std_private_memory_swap_allocator                  [system] { header "__memory/swap_allocator.h" }
-module std_private_memory_temp_value                      [system] { header "__memory/temp_value.h" }
-module std_private_memory_temporary_buffer                [system] { header "__memory/temporary_buffer.h" }
-module std_private_memory_uninitialized_algorithms        [system] {
-  header "__memory/uninitialized_algorithms.h"
-  export std_private_algorithm_copy
-}
-module std_private_memory_unique_ptr                      [system] {
-  header "__memory/unique_ptr.h"
-  export std_private_type_traits_add_lvalue_reference
-  export std_private_type_traits_is_pointer
-  export std_private_type_traits_type_identity
-}
-module std_private_memory_uses_allocator                  [system] { header "__memory/uses_allocator.h" }
-module std_private_memory_uses_allocator_construction     [system] { header "__memory/uses_allocator_construction.h" }
-module std_private_memory_voidify                         [system] { header "__memory/voidify.h" }
-
-module std_private_memory_resource_memory_resource              [system] { header "__memory_resource/memory_resource.h" }
-module std_private_memory_resource_memory_resource_fwd          [system] { header "__fwd/memory_resource.h" }
-module std_private_memory_resource_monotonic_buffer_resource    [system] { header "__memory_resource/monotonic_buffer_resource.h" }
-module std_private_memory_resource_polymorphic_allocator        [system] { header "__memory_resource/polymorphic_allocator.h" }
-module std_private_memory_resource_pool_options                 [system] { header "__memory_resource/pool_options.h" }
-module std_private_memory_resource_synchronized_pool_resource   [system] {
-  header "__memory_resource/synchronized_pool_resource.h"
-  export *
-}
-module std_private_memory_resource_unsynchronized_pool_resource [system] { header "__memory_resource/unsynchronized_pool_resource.h" }
-
-module std_private_mutex_lock_guard  [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__mutex/lock_guard.h"
-}
-module std_private_mutex_mutex       [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__mutex/mutex.h"
-}
-module std_private_mutex_tag_types   [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__mutex/tag_types.h"
-}
-module std_private_mutex_unique_lock [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__mutex/unique_lock.h"
-}
-
-module std_private_numeric_accumulate               [system] { header "__numeric/accumulate.h" }
-module std_private_numeric_adjacent_difference      [system] { header "__numeric/adjacent_difference.h" }
-module std_private_numeric_exclusive_scan           [system] { header "__numeric/exclusive_scan.h" }
-module std_private_numeric_gcd_lcm                  [system] { header "__numeric/gcd_lcm.h" }
-module std_private_numeric_inclusive_scan           [system] { header "__numeric/inclusive_scan.h" }
-module std_private_numeric_inner_product            [system] { header "__numeric/inner_product.h" }
-module std_private_numeric_iota                     [system] { header "__numeric/iota.h" }
-module std_private_numeric_midpoint                 [system] { header "__numeric/midpoint.h" }
-module std_private_numeric_partial_sum              [system] { header "__numeric/partial_sum.h" }
-module std_private_numeric_pstl_reduce              [system] { header "__numeric/pstl_reduce.h" }
-module std_private_numeric_pstl_transform_reduce    [system] {
-  header "__numeric/pstl_transform_reduce.h"
-  export *
-}
-module std_private_numeric_reduce                   [system] { header "__numeric/reduce.h" }
-module std_private_numeric_transform_exclusive_scan [system] { header "__numeric/transform_exclusive_scan.h" }
-module std_private_numeric_transform_inclusive_scan [system] { header "__numeric/transform_inclusive_scan.h" }
-module std_private_numeric_transform_reduce         [system] { header "__numeric/transform_reduce.h" }
-
-module std_private_random_bernoulli_distribution          [system] { header "__random/bernoulli_distribution.h" }
-module std_private_random_binomial_distribution           [system] { header "__random/binomial_distribution.h" }
-module std_private_random_cauchy_distribution             [system] { header "__random/cauchy_distribution.h" }
-module std_private_random_chi_squared_distribution        [system] { header "__random/chi_squared_distribution.h" }
-module std_private_random_clamp_to_integral               [system] { header "__random/clamp_to_integral.h" }
-module std_private_random_default_random_engine           [system] { header "__random/default_random_engine.h" }
-module std_private_random_discard_block_engine            [system] { header "__random/discard_block_engine.h" }
-module std_private_random_discrete_distribution           [system] {
-  header "__random/discrete_distribution.h"
-  export *
-}
-module std_private_random_exponential_distribution        [system] { header "__random/exponential_distribution.h" }
-module std_private_random_extreme_value_distribution      [system] { header "__random/extreme_value_distribution.h" }
-module std_private_random_fisher_f_distribution           [system] { header "__random/fisher_f_distribution.h" }
-module std_private_random_gamma_distribution              [system] { header "__random/gamma_distribution.h" }
-module std_private_random_generate_canonical              [system] { header "__random/generate_canonical.h" }
-module std_private_random_geometric_distribution          [system] { header "__random/geometric_distribution.h" }
-module std_private_random_independent_bits_engine         [system] { header "__random/independent_bits_engine.h" }
-module std_private_random_is_seed_sequence                [system] { header "__random/is_seed_sequence.h" }
-module std_private_random_is_valid                        [system] { header "__random/is_valid.h" }
-module std_private_random_knuth_b                         [system] { header "__random/knuth_b.h" }
-module std_private_random_linear_congruential_engine      [system] { header "__random/linear_congruential_engine.h" }
-module std_private_random_log2                            [system] { header "__random/log2.h" }
-module std_private_random_lognormal_distribution          [system] { header "__random/lognormal_distribution.h" }
-module std_private_random_mersenne_twister_engine         [system] { header "__random/mersenne_twister_engine.h" }
-module std_private_random_negative_binomial_distribution  [system] { header "__random/negative_binomial_distribution.h" }
-module std_private_random_normal_distribution             [system] { header "__random/normal_distribution.h" }
-module std_private_random_piecewise_constant_distribution [system] {
-  header "__random/piecewise_constant_distribution.h"
-  export *
-}
-module std_private_random_piecewise_linear_distribution   [system] {
-  header "__random/piecewise_linear_distribution.h"
-  export *
-}
-module std_private_random_poisson_distribution            [system] { header "__random/poisson_distribution.h" }
-module std_private_random_random_device                   [system] { header "__random/random_device.h" }
-module std_private_random_ranlux                          [system] { header "__random/ranlux.h" }
-module std_private_random_seed_seq                        [system] { header "__random/seed_seq.h" }
-module std_private_random_shuffle_order_engine            [system] { header "__random/shuffle_order_engine.h" }
-module std_private_random_student_t_distribution          [system] { header "__random/student_t_distribution.h" }
-module std_private_random_subtract_with_carry_engine      [system] { header "__random/subtract_with_carry_engine.h" }
-module std_private_random_uniform_int_distribution        [system] { header "__random/uniform_int_distribution.h" }
-module std_private_random_uniform_random_bit_generator    [system] { header "__random/uniform_random_bit_generator.h" }
-module std_private_random_uniform_real_distribution       [system] { header "__random/uniform_real_distribution.h" }
-module std_private_random_weibull_distribution            [system] { header "__random/weibull_distribution.h" }
-
-module std_private_ranges_access                     [system] { header "__ranges/access.h" }
-module std_private_ranges_all                        [system] {
-  header "__ranges/all.h"
-  export std_private_functional_compose
-  export std_private_functional_perfect_forward
-  export std_private_ranges_owning_view
-}
-module std_private_ranges_as_rvalue_view             [system] { header "__ranges/as_rvalue_view.h" }
-module std_private_ranges_common_view                [system] { header "__ranges/common_view.h" }
-module std_private_ranges_concepts                   [system] {
-  header "__ranges/concepts.h"
-  export std_private_iterator_concepts
-}
-module std_private_ranges_container_compatible_range [system] { header "__ranges/container_compatible_range.h" }
-module std_private_ranges_counted                    [system] {
-  header "__ranges/counted.h"
-  export std_span
-}
-module std_private_ranges_dangling                   [system] { header "__ranges/dangling.h" }
-module std_private_ranges_data                       [system] { header "__ranges/data.h" }
-module std_private_ranges_drop_view                  [system] { header "__ranges/drop_view.h" }
-module std_private_ranges_drop_while_view            [system] { header "__ranges/drop_while_view.h" }
-module std_private_ranges_elements_view              [system] { header "__ranges/elements_view.h" }
-module std_private_ranges_empty                      [system] { header "__ranges/empty.h" }
-module std_private_ranges_empty_view                 [system] { header "__ranges/empty_view.h" }
-module std_private_ranges_enable_borrowed_range      [system] { header "__ranges/enable_borrowed_range.h" }
-module std_private_ranges_enable_view                [system] { header "__ranges/enable_view.h" }
-module std_private_ranges_filter_view                [system] {
-  header "__ranges/filter_view.h"
-  export std_private_ranges_range_adaptor
-}
-module std_private_ranges_from_range                 [system] { header "__ranges/from_range.h" }
-module std_private_ranges_iota_view                  [system] { header "__ranges/iota_view.h" }
-module std_private_ranges_istream_view               [system] {
-  @requires_LIBCXX_ENABLE_LOCALIZATION@
-  header "__ranges/istream_view.h"
-}
-module std_private_ranges_join_view                  [system] {
-  header "__ranges/join_view.h"
-  export std_private_iterator_iterator_with_data
-  export std_private_iterator_segmented_iterator
-}
-module std_private_ranges_lazy_split_view            [system] {
-  header "__ranges/lazy_split_view.h"
-  export std_private_ranges_non_propagating_cache
-}
-module std_private_ranges_movable_box                [system] { header "__ranges/movable_box.h" }
-module std_private_ranges_non_propagating_cache      [system] { header "__ranges/non_propagating_cache.h" }
-module std_private_ranges_owning_view                [system] { header "__ranges/owning_view.h" }
-module std_private_ranges_range_adaptor              [system] { header "__ranges/range_adaptor.h" }
-module std_private_ranges_rbegin                     [system] { header "__ranges/rbegin.h" }
-module std_private_ranges_ref_view                   [system] { header "__ranges/ref_view.h" }
-module std_private_ranges_rend                       [system] { header "__ranges/rend.h" }
-module std_private_ranges_reverse_view               [system] { header "__ranges/reverse_view.h" }
-module std_private_ranges_single_view                [system] { header "__ranges/single_view.h" }
-module std_private_ranges_size                       [system] {
-  header "__ranges/size.h"
-  export std_private_type_traits_make_unsigned
-}
-module std_private_ranges_split_view                 [system] { header "__ranges/split_view.h" }
-module std_private_ranges_subrange                   [system] {
-  header "__ranges/subrange.h"
-  export std_private_ranges_subrange_fwd
-}
-module std_private_ranges_subrange_fwd               [system] {
-  header "__fwd/subrange.h"
-  export std_private_iterator_concepts
-}
-module std_private_ranges_take_view                  [system] { header "__ranges/take_view.h" }
-module std_private_ranges_take_while_view            [system] { header "__ranges/take_while_view.h" }
-module std_private_ranges_transform_view             [system] {
-  header "__ranges/transform_view.h"
-  export std_private_functional_bind_back
-  export std_private_functional_perfect_forward
-  export std_private_ranges_movable_box
-}
-module std_private_ranges_view_interface             [system] { header "__ranges/view_interface.h" }
-module std_private_ranges_views                      [system] { header "__ranges/views.h" }
-module std_private_ranges_zip_view                   [system] { header "__ranges/zip_view.h" }
-
-module std_private_span_span_fwd [system] { header "__fwd/span.h" }
-
-module std_private_stop_token_atomic_unique_lock   [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/atomic_unique_lock.h"
-}
-module std_private_stop_token_intrusive_list_view  [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/intrusive_list_view.h"
-}
-module std_private_stop_token_intrusive_shared_ptr [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/intrusive_shared_ptr.h"
-}
-module std_private_stop_token_stop_callback        [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/stop_callback.h"
-}
-module std_private_stop_token_stop_source          [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/stop_source.h"
-  export *
-}
-module std_private_stop_token_stop_state           [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/stop_state.h"
-  export *
-}
-module std_private_stop_token_stop_token           [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__stop_token/stop_token.h"
-  export *
-}
-
-module std_private_string_char_traits           [system] { header "__string/char_traits.h" }
-module std_private_string_constexpr_c_functions [system] {
-  header "__string/constexpr_c_functions.h"
-  export std_private_type_traits_is_equality_comparable
-}
-module std_private_string_extern_template_lists [system] { header "__string/extern_template_lists.h" }
-module std_private_string_string_fwd            [system] { header "__fwd/string.h" }
-
-module std_private_string_view_string_view_fwd [system] { header "__fwd/string_view.h" }
-
-module std_private_system_error_errc            [system] { header "__system_error/errc.h" }
-module std_private_system_error_error_category  [system] { header "__system_error/error_category.h" }
-module std_private_system_error_error_code      [system] {
-  header "__system_error/error_code.h"
-  export std_private_functional_hash
-  export std_private_functional_unary_function
-}
-module std_private_system_error_error_condition [system] {
-  header "__system_error/error_condition.h"
-  export std_private_functional_hash
-  export std_private_functional_unary_function
-}
-module std_private_system_error_system_error    [system] { header "__system_error/system_error.h" }
-
-module std_private_thread_formatter            [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__thread/formatter.h"
-}
-module std_private_thread_id                   [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__thread/id.h"
-}
-module std_private_thread_poll_with_backoff    [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__thread/poll_with_backoff.h"
-}
-module std_private_thread_this_thread          [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__thread/this_thread.h"
-}
-module std_private_thread_thread               [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__thread/thread.h"
-  export *
-}
-module std_private_thread_timed_backoff_policy [system] {
-  @requires_LIBCXX_ENABLE_THREADS@
-  header "__thread/timed_backoff_policy.h"
-}
-
-module std_private_tuple_get_fwd          [system] { header "__fwd/get.h" }
-module std_private_tuple_make_tuple_types [system] { header "__tuple/make_tuple_types.h" }
-module std_private_tuple_pair_like        [system] {
-  header "__tuple/pair_like.h"
-  export std_private_tuple_tuple_like
-}
-module std_private_tuple_sfinae_helpers   [system] { header "__tuple/sfinae_helpers.h" }
-module std_private_tuple_tuple_element    [system] { header "__tuple/tuple_element.h" }
-module std_private_tuple_tuple_fwd        [system] { header "__fwd/tuple.h" }
-module std_private_tuple_tuple_indices    [system] { header "__tuple/tuple_indices.h" }
-module std_private_tuple_tuple_like       [system] { header "__tuple/tuple_like.h" }
-module std_private_tuple_tuple_like_ext   [system] { header "__tuple/tuple_like_ext.h" }
-module std_private_tuple_tuple_size       [system] { header "__tuple/tuple_size.h" }
-module std_private_tuple_tuple_types      [system] { header "__tuple/tuple_types.h" }
-
-module std_private_type_traits_add_const                                 [system] { header "__type_traits/add_const.h" }
-module std_private_type_traits_add_cv                                    [system] { header "__type_traits/add_cv.h" }
-module std_private_type_traits_add_lvalue_reference                      [system] {
-  header "__type_traits/add_lvalue_reference.h"
-  export std_private_type_traits_is_referenceable
-}
-module std_private_type_traits_add_pointer                               [system] { header "__type_traits/add_pointer.h" }
-module std_private_type_traits_add_rvalue_reference                      [system] { header "__type_traits/add_rvalue_reference.h" }
-module std_private_type_traits_add_volatile                              [system] { header "__type_traits/add_volatile.h" }
-module std_private_type_traits_aligned_storage                           [system] { header "__type_traits/aligned_storage.h" }
-module std_private_type_traits_aligned_union                             [system] { header "__type_traits/aligned_union.h" }
-module std_private_type_traits_alignment_of                              [system] { header "__type_traits/alignment_of.h" }
-module std_private_type_traits_apply_cv                                  [system] {
-  header "__type_traits/apply_cv.h"
-  export std_private_type_traits_is_const
-  export std_private_type_traits_is_volatile
-}
-module std_private_type_traits_can_extract_key                           [system] { header "__type_traits/can_extract_key.h" }
-module std_private_type_traits_common_reference                          [system] {
-  header "__type_traits/common_reference.h"
-  export std_private_type_traits_remove_cvref
-}
-module std_private_type_traits_common_type                               [system] {
-  header "__type_traits/common_type.h"
-  export std_private_utility_declval
-}
-module std_private_type_traits_conditional                               [system] { header "__type_traits/conditional.h" }
-module std_private_type_traits_conjunction                               [system] { header "__type_traits/conjunction.h" }
-module std_private_type_traits_copy_cv                                   [system] { header "__type_traits/copy_cv.h" }
-module std_private_type_traits_copy_cvref                                [system] { header "__type_traits/copy_cvref.h" }
-module std_private_type_traits_datasizeof                                [system] { header "__type_traits/datasizeof.h" }
-module std_private_type_traits_decay                                     [system] {
-  header "__type_traits/decay.h"
-  export std_private_type_traits_add_pointer
-}
-module std_private_type_traits_dependent_type                            [system] { header "__type_traits/dependent_type.h" }
-module std_private_type_traits_disjunction                               [system] { header "__type_traits/disjunction.h" }
-module std_private_type_traits_enable_if                                 [system] { header "__type_traits/enable_if.h" }
-module std_private_type_traits_extent                                    [system] { header "__type_traits/extent.h" }
-module std_private_type_traits_has_unique_object_representation          [system] { header "__type_traits/has_unique_object_representation.h" }
-module std_private_type_traits_has_virtual_destructor                    [system] { header "__type_traits/has_virtual_destructor.h" }
-module std_private_type_traits_integral_constant                         [system] { header "__type_traits/integral_constant.h" }
-module std_private_type_traits_invoke                                    [system] {
-  header "__type_traits/invoke.h"
-  export std_private_type_traits_conditional
-  export std_private_type_traits_decay
-  export std_private_type_traits_decay
-  export std_private_type_traits_enable_if
-  export std_private_type_traits_is_base_of
-  export std_private_type_traits_is_core_convertible
-  export std_private_type_traits_is_reference_wrapper
-  export std_private_type_traits_is_same
-  export std_private_type_traits_is_void
-  export std_private_type_traits_nat
-  export std_private_type_traits_remove_cv
-}
-module std_private_type_traits_is_abstract                               [system] { header "__type_traits/is_abstract.h" }
-module std_private_type_traits_is_aggregate                              [system] { header "__type_traits/is_aggregate.h" }
-module std_private_type_traits_is_allocator                              [system] { header "__type_traits/is_allocator.h" }
-module std_private_type_traits_is_always_bitcastable                     [system] { header "__type_traits/is_always_bitcastable.h" }
-module std_private_type_traits_is_arithmetic                             [system] {
-  header "__type_traits/is_arithmetic.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_array                                  [system] {
-  header "__type_traits/is_array.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_assignable                             [system] { header "__type_traits/is_assignable.h" }
-module std_private_type_traits_is_base_of                                [system] { header "__type_traits/is_base_of.h" }
-module std_private_type_traits_is_bounded_array                          [system] { header "__type_traits/is_bounded_array.h" }
-module std_private_type_traits_is_callable                               [system] { header "__type_traits/is_callable.h" }
-module std_private_type_traits_is_char_like_type                         [system] { header "__type_traits/is_char_like_type.h" }
-module std_private_type_traits_is_class                                  [system] { header "__type_traits/is_class.h" }
-module std_private_type_traits_is_compound                               [system] { header "__type_traits/is_compound.h" }
-module std_private_type_traits_is_const                                  [system] { header "__type_traits/is_const.h" }
-module std_private_type_traits_is_constant_evaluated                     [system] { header "__type_traits/is_constant_evaluated.h" }
-module std_private_type_traits_is_constructible                          [system] { header "__type_traits/is_constructible.h" }
-module std_private_type_traits_is_convertible                            [system] {
-  header "__type_traits/is_convertible.h"
-  export std_private_type_traits_is_array
-}
-module std_private_type_traits_is_copy_assignable                        [system] { header "__type_traits/is_copy_assignable.h" }
-module std_private_type_traits_is_copy_constructible                     [system] { header "__type_traits/is_copy_constructible.h" }
-module std_private_type_traits_is_core_convertible                       [system] {
-  header "__type_traits/is_core_convertible.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_default_constructible                  [system] { header "__type_traits/is_default_constructible.h" }
-module std_private_type_traits_is_destructible                           [system] { header "__type_traits/is_destructible.h" }
-module std_private_type_traits_is_empty                                  [system] { header "__type_traits/is_empty.h" }
-module std_private_type_traits_is_enum                                   [system] {
-  header "__type_traits/is_enum.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_equality_comparable                    [system] {
-  header "__type_traits/is_equality_comparable.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_execution_policy                       [system] {
-  header "__type_traits/is_execution_policy.h"
-  export std_private_type_traits_remove_cvref
-}
-module std_private_type_traits_is_final                                  [system] { header "__type_traits/is_final.h" }
-module std_private_type_traits_is_floating_point                         [system] { header "__type_traits/is_floating_point.h" }
-module std_private_type_traits_is_function                               [system] { header "__type_traits/is_function.h" }
-module std_private_type_traits_is_fundamental                            [system] { header "__type_traits/is_fundamental.h" }
-module std_private_type_traits_is_implicitly_default_constructible       [system] { header "__type_traits/is_implicitly_default_constructible.h" }
-module std_private_type_traits_is_integral                               [system] { header "__type_traits/is_integral.h" }
-module std_private_type_traits_is_literal_type                           [system] { header "__type_traits/is_literal_type.h" }
-module std_private_type_traits_is_member_function_pointer                [system] { header "__type_traits/is_member_function_pointer.h" }
-module std_private_type_traits_is_member_object_pointer                  [system] { header "__type_traits/is_member_object_pointer.h" }
-module std_private_type_traits_is_member_pointer                         [system] { header "__type_traits/is_member_pointer.h" }
-module std_private_type_traits_is_move_assignable                        [system] { header "__type_traits/is_move_assignable.h" }
-module std_private_type_traits_is_move_constructible                     [system] { header "__type_traits/is_move_constructible.h" }
-module std_private_type_traits_is_nothrow_assignable                     [system] { header "__type_traits/is_nothrow_assignable.h" }
-module std_private_type_traits_is_nothrow_constructible                  [system] { header "__type_traits/is_nothrow_constructible.h" }
-module std_private_type_traits_is_nothrow_convertible                    [system] { header "__type_traits/is_nothrow_convertible.h" }
-module std_private_type_traits_is_nothrow_copy_assignable                [system] { header "__type_traits/is_nothrow_copy_assignable.h" }
-module std_private_type_traits_is_nothrow_copy_constructible             [system] { header "__type_traits/is_nothrow_copy_constructible.h" }
-module std_private_type_traits_is_nothrow_default_constructible          [system] { header "__type_traits/is_nothrow_default_constructible.h" }
-module std_private_type_traits_is_nothrow_destructible                   [system] {
-  header "__type_traits/is_nothrow_destructible.h"
-  export std_private_type_traits_is_destructible
-}
-module std_private_type_traits_is_nothrow_move_assignable                [system] { header "__type_traits/is_nothrow_move_assignable.h" }
-module std_private_type_traits_is_nothrow_move_constructible             [system] {
-  header "__type_traits/is_nothrow_move_constructible.h"
-  export std_private_type_traits_is_nothrow_constructible
-}
-module std_private_type_traits_is_null_pointer                           [system] {
-  header "__type_traits/is_null_pointer.h"
-  export std_cstddef
-}
-module std_private_type_traits_is_object                                 [system] {
-  header "__type_traits/is_object.h"
-  export std_private_type_traits_is_scalar
-}
-module std_private_type_traits_is_pod                                    [system] { header "__type_traits/is_pod.h" }
-module std_private_type_traits_is_pointer                                [system] { header "__type_traits/is_pointer.h" }
-module std_private_type_traits_is_polymorphic                            [system] { header "__type_traits/is_polymorphic.h" }
-module std_private_type_traits_is_primary_template                       [system] {
-  header "__type_traits/is_primary_template.h"
-  export std_private_type_traits_enable_if
-}
-module std_private_type_traits_is_reference                              [system] { header "__type_traits/is_reference.h" }
-module std_private_type_traits_is_reference_wrapper                      [system] { header "__type_traits/is_reference_wrapper.h" }
-module std_private_type_traits_is_referenceable                          [system] { header "__type_traits/is_referenceable.h" }
-module std_private_type_traits_is_same                                   [system] {
-  header "__type_traits/is_same.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_scalar                                 [system] {
-  header "__type_traits/is_scalar.h"
-  export std_private_type_traits_is_null_pointer
-}
-module std_private_type_traits_is_scoped_enum                            [system] { header "__type_traits/is_scoped_enum.h" }
-module std_private_type_traits_is_signed                                 [system] { header "__type_traits/is_signed.h" }
-module std_private_type_traits_is_signed_integer                         [system] { header "__type_traits/is_signed_integer.h" }
-module std_private_type_traits_is_specialization                         [system] { header "__type_traits/is_specialization.h" }
-module std_private_type_traits_is_standard_layout                        [system] { header "__type_traits/is_standard_layout.h" }
-module std_private_type_traits_is_swappable                              [system] {
-  header "__type_traits/is_swappable.h"
-  export std_private_type_traits_is_move_constructible
-}
-module std_private_type_traits_is_trivial                                [system] { header "__type_traits/is_trivial.h" }
-module std_private_type_traits_is_trivially_assignable                   [system] { header "__type_traits/is_trivially_assignable.h" }
-module std_private_type_traits_is_trivially_constructible                [system] { header "__type_traits/is_trivially_constructible.h" }
-module std_private_type_traits_is_trivially_copy_assignable              [system] { header "__type_traits/is_trivially_copy_assignable.h" }
-module std_private_type_traits_is_trivially_copy_constructible           [system] { header "__type_traits/is_trivially_copy_constructible.h" }
-module std_private_type_traits_is_trivially_copyable                     [system] { header "__type_traits/is_trivially_copyable.h" }
-module std_private_type_traits_is_trivially_default_constructible        [system] { header "__type_traits/is_trivially_default_constructible.h" }
-module std_private_type_traits_is_trivially_destructible                 [system] { header "__type_traits/is_trivially_destructible.h" }
-module std_private_type_traits_is_trivially_lexicographically_comparable [system] { header "__type_traits/is_trivially_lexicographically_comparable.h" }
-module std_private_type_traits_is_trivially_move_assignable              [system] { header "__type_traits/is_trivially_move_assignable.h" }
-module std_private_type_traits_is_trivially_move_constructible           [system] { header "__type_traits/is_trivially_move_constructible.h" }
-module std_private_type_traits_is_unbounded_array                        [system] { header "__type_traits/is_unbounded_array.h" }
-module std_private_type_traits_is_union                                  [system] { header "__type_traits/is_union.h" }
-module std_private_type_traits_is_unsigned                               [system] { header "__type_traits/is_unsigned.h" }
-module std_private_type_traits_is_unsigned_integer                       [system] { header "__type_traits/is_unsigned_integer.h" }
-module std_private_type_traits_is_valid_expansion                        [system] { header "__type_traits/is_valid_expansion.h" }
-module std_private_type_traits_is_void                                   [system] {
-  header "__type_traits/is_void.h"
-  export std_private_type_traits_integral_constant
-}
-module std_private_type_traits_is_volatile                               [system] { header "__type_traits/is_volatile.h" }
-module std_private_type_traits_lazy                                      [system] { header "__type_traits/lazy.h" }
-module std_private_type_traits_make_32_64_or_128_bit                     [system] { header "__type_traits/make_32_64_or_128_bit.h" }
-module std_private_type_traits_make_const_lvalue_ref                     [system] { header "__type_traits/make_const_lvalue_ref.h" }
-module std_private_type_traits_make_signed                               [system] { header "__type_traits/make_signed.h" }
-module std_private_type_traits_make_unsigned                             [system] {
-  header "__type_traits/make_unsigned.h"
-  export std_private_type_traits_is_unsigned
-}
-module std_private_type_traits_maybe_const                               [system] { header "__type_traits/maybe_const.h" }
-module std_private_type_traits_nat                                       [system] { header "__type_traits/nat.h" }
-module std_private_type_traits_negation                                  [system] { header "__type_traits/negation.h" }
-module std_private_type_traits_noexcept_move_assign_container            [system] { header "__type_traits/noexcept_move_assign_container.h" }
-module std_private_type_traits_operation_traits                          [system] { header "__type_traits/operation_traits.h" }
-module std_private_type_traits_predicate_traits                          [system] { header "__type_traits/predicate_traits.h" }
-module std_private_type_traits_promote                                   [system] { header "__type_traits/promote.h" }
-module std_private_type_traits_rank                                      [system] { header "__type_traits/rank.h" }
-module std_private_type_traits_remove_all_extents                        [system] { header "__type_traits/remove_all_extents.h" }
-module std_private_type_traits_remove_const                              [system] { header "__type_traits/remove_const.h" }
-module std_private_type_traits_remove_const_ref                          [system] { header "__type_traits/remove_const_ref.h" }
-module std_private_type_traits_remove_cv                                 [system] {
-  header "__type_traits/remove_cv.h"
-  export std_private_type_traits_remove_const
-  export std_private_type_traits_remove_volatile
-}
-module std_private_type_traits_remove_cvref                              [system] { header "__type_traits/remove_cvref.h" }
-module std_private_type_traits_remove_extent                             [system] { header "__type_traits/remove_extent.h" }
-module std_private_type_traits_remove_pointer                            [system] { header "__type_traits/remove_pointer.h" }
-module std_private_type_traits_remove_reference                          [system] { header "__type_traits/remove_reference.h" }
-module std_private_type_traits_remove_volatile                           [system] { header "__type_traits/remove_volatile.h" }
-module std_private_type_traits_result_of                                 [system] { header "__type_traits/result_of.h" }
-module std_private_type_traits_strip_signature                           [system] { header "__type_traits/strip_signature.h" }
-module std_private_type_traits_type_identity                             [system] { header "__type_traits/type_identity.h" }
-module std_private_type_traits_type_list                                 [system] { header "__type_traits/type_list.h" }
-module std_private_type_traits_underlying_type                           [system] {
-  header "__type_traits/underlying_type.h"
-  export std_private_type_traits_is_enum
-}
-module std_private_type_traits_unwrap_ref                                [system] { header "__type_traits/unwrap_ref.h" }
-module std_private_type_traits_void_t                                    [system] { header "__type_traits/void_t.h" }
-
-module std_private_utility_as_const               [system] { header "__utility/as_const.h" }
-module std_private_utility_auto_cast              [system] {
-  header "__utility/auto_cast.h"
-  export std_private_type_traits_decay
-}
-module std_private_utility_cmp                    [system] {
-  header "__utility/cmp.h"
-  export std_private_type_traits_make_unsigned
-}
-module std_private_utility_convert_to_integral    [system] { header "__utility/convert_to_integral.h" }
-module std_private_utility_declval                [system] { header "__utility/declval.h" }
-module std_private_utility_exception_guard        [system] { header "__utility/exception_guard.h" }
-module std_private_utility_exchange               [system] { header "__utility/exchange.h" }
-module std_private_utility_forward                [system] { header "__utility/forward.h" }
-module std_private_utility_forward_like           [system] { header "__utility/forward_like.h" }
-module std_private_utility_in_place               [system] { header "__utility/in_place.h" }
-module std_private_utility_integer_sequence       [system] { header "__utility/integer_sequence.h" }
-module std_private_utility_is_pointer_in_range    [system] { header "__utility/is_pointer_in_range.h" }
-module std_private_utility_move                   [system] {
-  header "__utility/move.h"
-  export std_private_type_traits_is_copy_constructible
-  export std_private_type_traits_is_nothrow_move_constructible
-  export std_private_type_traits_remove_reference
-}
-module std_private_utility_pair                   [system] {
-  header "__utility/pair.h"
-  export std_private_ranges_subrange_fwd
-  export std_private_tuple_pair_like
-  export std_private_type_traits_is_assignable
-  export std_private_type_traits_is_constructible
-  export std_private_type_traits_is_convertible
-  export std_private_type_traits_is_copy_assignable
-  export std_private_type_traits_is_move_assignable
-  export std_private_type_traits_is_nothrow_copy_constructible
-  export std_private_type_traits_is_nothrow_default_constructible
-  export std_private_type_traits_is_nothrow_move_assignable
-}
-module std_private_utility_pair_fwd               [system] { header "__fwd/pair.h" }
-module std_private_utility_piecewise_construct    [system] { header "__utility/piecewise_construct.h" }
-module std_private_utility_priority_tag           [system] { header "__utility/priority_tag.h" }
-module std_private_utility_rel_ops                [system] { header "__utility/rel_ops.h" }
-module std_private_utility_swap                   [system] {
-  header "__utility/swap.h"
-  export std_private_type_traits_is_swappable
-}
-module std_private_utility_terminate_on_exception [system] { header "__utility/terminate_on_exception.h" }
-module std_private_utility_to_underlying          [system] { header "__utility/to_underlying.h" }
-module std_private_utility_unreachable            [system] { header "__utility/unreachable.h" }
-
-module std_private_variant_monostate [system] { header "__variant/monostate.h" }

libcxx/test/libcxx/lint/lint_headers.sh.py

 # RUN: %{python} %s
 
 # Verify that each run of consecutive #include directives
 # in each libcxx/include/ header is maintained in alphabetical order.
 
 import glob
 import os
 import re
 
 
 def exclude_from_consideration(path):
     return (
-        path.endswith(".txt")
+        path.endswith(".py")
+        or path.endswith(".txt")
+        or path.endswith(".json.in")
         or path.endswith(".modulemap.in")
         or os.path.basename(path) == "__config"
         or os.path.basename(path) == "__config_site.in"
         or os.path.basename(path) == "libcxx.imp"
         or os.path.basename(path).startswith("__pstl")
         or not os.path.isfile(path)  # TODO: Remove once PSTL integration is finished
     )
 

libcxx/utils/libcxx/test/header_information.py

mandatory_inclusions = {
     "vector": ["compare", "initializer_list"],
 }
 
 def is_header(file):
     """Returns whether the given file is a header (i.e. not a directory or the modulemap file)."""
     return (
         not file.is_dir()
         and not file.name == "module.modulemap.in"
+        and not file.name == "internal_module_attributes.json.in"
         and not file.name == "CMakeLists.txt"
+        and not file.name == "generate_module_map.py"
         and file.name != "libcxx.imp"
     )
 
 libcxx_root = pathlib.Path(os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))))
 include = pathlib.Path(os.path.join(libcxx_root, "include"))
 test = pathlib.Path(os.path.join(libcxx_root, "test"))
 assert libcxx_root.exists()