Sphinx-based clang man pages

[axw]

Summary

This diff introduces .rst files, Sphinx config, and a CMake target
for building clang man pages. This will deprecate the existing .pod-
based man page, and will integrate nicely with CMake. This diff does
not remove the existing man page; that will be done in a follow-up
once packagers have had a chance to react to the change.

For now, only clang(1) has been done; others can be added over time
by dropping additional files into the docs/CommandGuide directory.
The index page for CommandGuide has been copied from LLVM's
docs/CommandGuide.

The man page itself is mostly the same, with a few minor cosmetic
changes. The only major change is the SYNOPSIS section. I was unable
to get .rst/Sphinx produce the same style as in the existing man page.
Instead, I changed it to match the LLVM tools' relatively simple style.

To build the man pages, use the "docs-clang-man" target if building
with CMake. Otherwise, use "make -f Makefile.sphinx man".

[beanz]

These patches only modify the CMake build system, not the autoconf build system. Was that intentional? If so, you're only deprecating the pod-based manpage generation for CMake, which means it will still need to be kept in-sync and up-to-date for autoconf generation.

[silvas]

This is looking good. What is the ETA for getting packagers to update? It would be nice if you could chase down a couple and alert them to this change. Otherwise I fear that we will be keeping the pod file forever.

docs/conf.py

215–249

Probably mention in a comment that this chunk of autodiscovery code is derived from llvm's.

[axw]

In D10562#191155, @beanz wrote:

These patches only modify the CMake build system, not the autoconf build system. Was that intentional? If so, you're only deprecating the pod-based manpage generation for CMake, which means it will still need to be kept in-sync and up-to-date for autoconf generation.

I'm not really sure what the policies, if any, are around breaking packaging. My intention is to set a date to remove the files:

clang/docs/clang.pod
clang/docs/tools/Makefile
clang/docs/tools/manpage.css

Since there'll be a branch for 3.7 soon, that could be done when 3.7 is out.

The change for packagers should be pretty small, assuming they're already building the sphinx docs. If using CMake (nobody yet, I expect), the new target can be used. Otherwise, use Makefile.sphinx directly. The latter is what the Debian packaging scripts do for the LLVM docs and man pages, since there are no targets for them in the autotools build.

[axw]

In D10562#191307, @silvas wrote:

This is looking good. What is the ETA for getting packagers to update? It would be nice if you could chase down a couple and alert them to this change. Otherwise I fear that we will be keeping the pod file forever.

As in my other reply, my intention is to set a date to remove the files, forcing packaging scripts to be updated. I'm not sure if that is acceptable practice, so would need guidance. I'll send an email to cfe-dev. I intend to send a patch for the Debian packaging, and I'll see if I can find the maintainers for other popular distros to let them know.

[axw]

Mention that conf.py's autodiscovery is based on LLVM's

docs/conf.py

215–249

Done.

[silvas]

In D10562#191408, @axw wrote:

In D10562#191307, @silvas wrote:

This is looking good. What is the ETA for getting packagers to update? It would be nice if you could chase down a couple and alert them to this change. Otherwise I fear that we will be keeping the pod file forever.

As in my other reply, my intention is to set a date to remove the files, forcing packaging scripts to be updated. I'm not sure if that is acceptable practice, so would need guidance. I'll send an email to cfe-dev. I intend to send a patch for the Debian packaging, and I'll see if I can find the maintainers for other popular distros to let them know.

Maybe chime in on Hans' post [LLVMdev] LLVM 3.7 release plan and call for testers. That's probably going to be the highest concentration of people involved in packaging/releasing.

[axw]

Remove clang/docs/tools/Makefile, clang.pod, etc.

[axw]

In D10562#191981, @silvas wrote:

In D10562#191408, @axw wrote:

In D10562#191307, @silvas wrote:

This is looking good. What is the ETA for getting packagers to update? It would be nice if you could chase down a couple and alert them to this change. Otherwise I fear that we will be keeping the pod file forever.

As in my other reply, my intention is to set a date to remove the files, forcing packaging scripts to be updated. I'm not sure if that is acceptable practice, so would need guidance. I'll send an email to cfe-dev. I intend to send a patch for the Debian packaging, and I'll see if I can find the maintainers for other popular distros to let them know.

Maybe chime in on Hans' post [LLVMdev] LLVM 3.7 release plan and call for testers. That's probably going to be the highest concentration of people involved in packaging/releasing.

I replied to a slightly older 3.7 release plan thread, and also to the package maintainers for Fedora (Adam) and SuSE (Ismail). So far only have heard back from Ismail, who said it's fine. It's a fairly trivial change, so IMO it would be fair to give until next week before assuming tacit approval, and removing the old stuff (which I've added to the diff),

[gaeke]

It looks like this patch (because it is based on r239597) may have lost the changes made to clang.pod in r239652. It might be a good idea to incorporate these before removing clang.pod for good.

[axw]

Incorporate updates from r239652

[axw]

In D10562#195269, @gaeke wrote:

It looks like this patch (because it is based on r239597) may have lost the changes made to clang.pod in r239652. It might be a good idea to incorporate these before removing clang.pod for good.

Thanks for catching that - updated.

[gaeke]

Looks good.

[dim]

This looks good to me too. We had been using the .pod based man page in FreeBSD for a while, since building man pages from the other .rst files in tools/clang/docs resulted in *very* incomplete output, which looked partly like documentation, partly like a manpage...

docs/CMakeLists.txt

 endif()
 
 if (LLVM_ENABLE_SPHINX)
   if (SPHINX_FOUND)
     include(AddSphinxTarget)
     if (${SPHINX_OUTPUT_HTML})
       add_sphinx_target(html clang)
     endif()
+    if (${SPHINX_OUTPUT_MAN})
+      add_sphinx_target(man clang)
+    endif()
   endif()
 endif()

docs/CommandGuide/clang.rst

+clang - the Clang C, C++, and Objective-C compiler
+==================================================
+
+SYNOPSIS
+--------
+
+:program:`clang` [*options*] *filename ...*
+
+DESCRIPTION
+-----------
+
+:program:`clang` is a C, C++, and Objective-C compiler which encompasses
+preprocessing, parsing, optimization, code generation, assembly, and linking.
+Depending on which high-level mode setting is passed, Clang will stop before
+doing a full link.  While Clang is highly integrated, it is important to
+understand the stages of compilation, to understand how to invoke it.  These
+stages are:
+
+Driver
+    The clang executable is actually a small driver which controls the overall
+    execution of other tools such as the compiler, assembler and linker.
+    Typically you do not need to interact with the driver, but you
+    transparently use it to run the other tools.
+
+Preprocessing
+    This stage handles tokenization of the input source file, macro expansion,
+    #include expansion and handling of other preprocessor directives.  The
+    output of this stage is typically called a ".i" (for C), ".ii" (for C++),
+    ".mi" (for Objective-C), or ".mii" (for Objective-C++) file.
+
+Parsing and Semantic Analysis
+    This stage parses the input file, translating preprocessor tokens into a
+    parse tree.  Once in the form of a parse tree, it applies semantic
+    analysis to compute types for expressions as well and determine whether
+    the code is well formed. This stage is responsible for generating most of
+    the compiler warnings as well as parse errors. The output of this stage is
+    an "Abstract Syntax Tree" (AST).
+
+Code Generation and Optimization
+    This stage translates an AST into low-level intermediate code (known as
+    "LLVM IR") and ultimately to machine code.  This phase is responsible for
+    optimizing the generated code and handling target-specific code generation.
+    The output of this stage is typically called a ".s" file or "assembly" file.
+
+    Clang also supports the use of an integrated assembler, in which the code
+    generator produces object files directly. This avoids the overhead of
+    generating the ".s" file and of calling the target assembler.
+
+Assembler
+    This stage runs the target assembler to translate the output of the
+    compiler into a target object file. The output of this stage is typically
+    called a ".o" file or "object" file.
+
+Linker
+    This stage runs the target linker to merge multiple object files into an
+    executable or dynamic library. The output of this stage is typically called
+    an "a.out", ".dylib" or ".so" file.
+
+:program:`Clang Static Analyzer`
+
+The Clang Static Analyzer is a tool that scans source code to try to find bugs
+through code analysis.  This tool uses many parts of Clang and is built into
+the same driver.  Please see <http://clang-analyzer.llvm.org> for more details
+on how to use the static analyzer.
+
+OPTIONS
+-------
+
+Stage Selection Options
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. option:: -E
+
+ Run the preprocessor stage.
+
+.. option:: -fsyntax-only
+
+ Run the preprocessor, parser and type checking stages.
+
+.. option:: -S
+
+ Run the previous stages as well as LLVM generation and optimization stages
+ and target-specific code generation, producing an assembly file.
+
+.. option:: -c
+
+ Run all of the above, plus the assembler, generating a target ".o" object file.
+
+.. option:: no stage selection option
+
+ If no stage selection option is specified, all stages above are run, and the
+ linker is run to combine the results into an executable or shared library.
+
+Language Selection and Mode Options
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. option:: -x <language>
+
+ Treat subsequent input files as having type language.
+
+.. option:: -std=<language>
+
+ Specify the language standard to compile for.
+
+.. option:: -stdlib=<library>
+
+ Specify the C++ standard library to use; supported options are libstdc++ and
+ libc++.
+
+.. option:: -ansi
+
+ Same as -std=c89.
+
+.. option:: -ObjC, -ObjC++
+
+ Treat source input files as Objective-C and Object-C++ inputs respectively.
+
+.. option:: -trigraphs
+
+ Enable trigraphs.
+
+.. option:: -ffreestanding
+
+ Indicate that the file should be compiled for a freestanding, not a hosted,
+ environment.
+
+.. option:: -fno-builtin
+
+ Disable special handling and optimizations of builtin functions like
+ :c:func:`strlen` and :c:func:`malloc`.
+
+.. option:: -fmath-errno
+
+ Indicate that math functions should be treated as updating :c:data:`errno`.
+
+.. option:: -fpascal-strings
+
+ Enable support for Pascal-style strings with "\\pfoo".
+
+.. option:: -fms-extensions
+
+ Enable support for Microsoft extensions.
+
+.. option:: -fmsc-version=
+
+ Set _MSC_VER. Defaults to 1300 on Windows. Not set otherwise.
+
+.. option:: -fborland-extensions
+
+ Enable support for Borland extensions.
+
+.. option:: -fwritable-strings
+
+ Make all string literals default to writable.  This disables uniquing of
+ strings and other optimizations.
+
+.. option:: -flax-vector-conversions
+
+ Allow loose type checking rules for implicit vector conversions.
+
+.. option:: -fblocks
+
+ Enable the "Blocks" language feature.
+
+.. option:: -fobjc-gc-only
+
+ Indicate that Objective-C code should be compiled in GC-only mode, which only
+ works when Objective-C Garbage Collection is enabled.
+
+.. option:: -fobjc-gc
+
+ Indicate that Objective-C code should be compiled in hybrid-GC mode, which
+ works with both GC and non-GC mode.
+
+.. option:: -fobjc-abi-version=version
+
+ Select the Objective-C ABI version to use. Available versions are 1 (legacy
+ "fragile" ABI), 2 (non-fragile ABI 1), and 3 (non-fragile ABI 2).
+
+.. option:: -fobjc-nonfragile-abi-version=<version>
+
+ Select the Objective-C non-fragile ABI version to use by default. This will
+ only be used as the Objective-C ABI when the non-fragile ABI is enabled
+ (either via :option:`-fobjc-nonfragile-abi`, or because it is the platform
+ default).
+
+.. option:: -fobjc-nonfragile-abi
+
+ Enable use of the Objective-C non-fragile ABI. On platforms for which this is
+ the default ABI, it can be disabled with :option:`-fno-objc-nonfragile-abi`.
+
+Target Selection Options
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Clang fully supports cross compilation as an inherent part of its design.
+Depending on how your version of Clang is configured, it may have support for a
+number of cross compilers, or may only support a native target.
+
+.. option:: -arch <architecture>
+
+  Specify the architecture to build for.
+
+.. option:: -mmacosx-version-min=<version>
+
+  When building for Mac OS X, specify the minimum version supported by your
+  application.
+
+.. option:: -miphoneos-version-min
+
+  When building for iPhone OS, specify the minimum version supported by your
+  application.
+
+.. option:: -march=<cpu>
+
+  Specify that Clang should generate code for a specific processor family
+  member and later.  For example, if you specify -march=i486, the compiler is
+  allowed to generate instructions that are valid on i486 and later processors,
+  but which may not exist on earlier ones.
+
+
+Code Generation Options
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. option:: -O0, -O1, -O2, -O3, -Ofast, -Os, -Oz, -O, -O4
+
+  Specify which optimization level to use:
+
+    :option:`-O0` Means "no optimization": this level compiles the fastest and
+    generates the most debuggable code.
+
+    :option:`-O1` Somewhere between :option:`-O0` and :option:`-O2`.
+
+    :option:`-O2` Moderate level of optimization which enables most
+    optimizations.
+
+    :option:`-O3` Like :option:`-O2`, except that it enables optimizations that
+    take longer to perform or that may generate larger code (in an attempt to
+    make the program run faster).
+
+    :option:`-Ofast` Enables all the optimizations from :option:`-O3` along
+    with other aggressive optimizations that may violate strict compliance with
+    language standards.
+
+    :option:`-Os` Like :option:`-O2` with extra optimizations to reduce code
+    size.
+
+    :option:`-Oz` Like :option:`-Os` (and thus :option:`-O2`), but reduces code
+    size further.
+
+    :option:`-O` Equivalent to :option:`-O2`.
+
+    :option:`-O4` and higher
+
+      Currently equivalent to :option:`-O3`
+
+.. option:: -g
+
+  Generate debug information.  Note that Clang debug information works best at -O0.
+
+.. option:: -fstandalone-debug -fno-standalone-debug
+
+  Clang supports a number of optimizations to reduce the size of debug
+  information in the binary. They work based on the assumption that the
+  debug type information can be spread out over multiple compilation units.
+  For instance, Clang will not emit type definitions for types that are not
+  needed by a module and could be replaced with a forward declaration.
+  Further, Clang will only emit type info for a dynamic C++ class in the
+  module that contains the vtable for the class.
+
+  The :option:`-fstandalone-debug` option turns off these optimizations.
+  This is useful when working with 3rd-party libraries that don't come with
+  debug information.  This is the default on Darwin.  Note that Clang will
+  never emit type information for types that are not referenced at all by the
+  program.
+
+.. option:: -fexceptions
+
+  Enable generation of unwind information. This allows exceptions to be thrown
+  through Clang compiled stack frames.  This is on by default in x86-64.
+
+.. option:: -ftrapv
+
+  Generate code to catch integer overflow errors.  Signed integer overflow is
+  undefined in C. With this flag, extra code is generated to detect this and
+  abort when it happens.
+
+.. option:: -fvisibility
+
+  This flag sets the default visibility level.
+
+.. option:: -fcommon
+
+  This flag specifies that variables without initializers get common linkage.
+  It can be disabled with :option:`-fno-common`.
+
+.. option:: -ftls-model=<model>
+
+  Set the default thread-local storage (TLS) model to use for thread-local
+  variables. Valid values are: "global-dynamic", "local-dynamic",
+  "initial-exec" and "local-exec". The default is "global-dynamic". The default
+  model can be overridden with the tls_model attribute. The compiler will try
+  to choose a more efficient model if possible.
+
+.. option:: -flto, -emit-llvm
+
+  Generate output files in LLVM formats, suitable for link time optimization.
+  When used with :option:`-S` this generates LLVM intermediate language
+  assembly files, otherwise this generates LLVM bitcode format object files
+  (which may be passed to the linker depending on the stage selection options).
+
+Driver Options
+~~~~~~~~~~~~~~
+
+.. option:: -###
+
+  Print (but do not run) the commands to run for this compilation.
+
+.. option:: --help
+
+  Display available options.
+
+.. option:: -Qunused-arguments
+
+  Do not emit any warnings for unused driver arguments.
+
+.. option:: -Wa,<args>
+
+  Pass the comma separated arguments in args to the assembler.
+
+.. option:: -Wl,<args>
+
+  Pass the comma separated arguments in args to the linker.
+
+.. option:: -Wp,<args>
+
+  Pass the comma separated arguments in args to the preprocessor.
+
+.. option:: -Xanalyzer <arg>
+
+  Pass arg to the static analyzer.
+
+.. option:: -Xassembler <arg>
+
+  Pass arg to the assembler.
+
+.. option:: -Xlinker <arg>
+
+  Pass arg to the linker.
+
+.. option:: -Xpreprocessor <arg>
+
+  Pass arg to the preprocessor.
+
+.. option:: -o <file>
+
+  Write output to file.
+
+.. option:: -print-file-name=<file>
+
+  Print the full library path of file.
+
+.. option:: -print-libgcc-file-name
+
+  Print the library path for "libgcc.a".
+
+.. option:: -print-prog-name=<name>
+
+  Print the full program path of name.
+
+.. option:: -print-search-dirs
+
+  Print the paths used for finding libraries and programs.
+
+.. option:: -save-temps
+
+  Save intermediate compilation results.
+
+.. option:: -integrated-as, -no-integrated-as
+
+  Used to enable and disable, respectively, the use of the integrated
+  assembler. Whether the integrated assembler is on by default is target
+  dependent.
+
+.. option:: -time
+
+  Time individual commands.
+
+.. option:: -ftime-report
+
+  Print timing summary of each stage of compilation.
+
+.. option:: -v
+
+  Show commands to run and use verbose output.
+
+
+Diagnostics Options
+~~~~~~~~~~~~~~~~~~~
+
+.. option:: -fshow-column, -fshow-source-location, -fcaret-diagnostics, -fdiagnostics-fixit-info, -fdiagnostics-parseable-fixits, -fdiagnostics-print-source-range-info, -fprint-source-range-info, -fdiagnostics-show-option, -fmessage-length
+
+  These options control how Clang prints out information about diagnostics
+  (errors and warnings). Please see the Clang User's Manual for more information.
+
+Preprocessor Options
+~~~~~~~~~~~~~~~~~~~~
+
+.. option:: -D<macroname>=<value>
+
+  Adds an implicit #define into the predefines buffer which is read before the
+  source file is preprocessed.
+
+.. option:: -U<macroname>
+
+  Adds an implicit #undef into the predefines buffer which is read before the
+  source file is preprocessed.
+
+.. option:: -include <filename>
+
+  Adds an implicit #include into the predefines buffer which is read before the
+  source file is preprocessed.
+
+.. option:: -I<directory>
+
+  Add the specified directory to the search path for include files.
+
+.. option:: -F<directory>
+
+  Add the specified directory to the search path for framework include files.
+
+.. option:: -nostdinc
+
+  Do not search the standard system directories or compiler builtin directories
+  for include files.
+
+.. option:: -nostdlibinc
+
+  Do not search the standard system directories for include files, but do
+  search compiler builtin include directories.
+
+.. option:: -nobuiltininc
+
+  Do not search clang's builtin directory for include files.
+
+
+ENVIRONMENT
+-----------
+
+.. envvar:: TMPDIR, TEMP, TMP
+
+  These environment variables are checked, in order, for the location to write
+  temporary files used during the compilation process.
+
+.. envvar:: CPATH
+
+  If this environment variable is present, it is treated as a delimited list of
+  paths to be added to the default system include path list. The delimiter is
+  the platform dependent delimiter, as used in the PATH environment variable.
+
+  Empty components in the environment variable are ignored.
+
+.. envvar:: C_INCLUDE_PATH, OBJC_INCLUDE_PATH, CPLUS_INCLUDE_PATH, OBJCPLUS_INCLUDE_PATH
+
+  These environment variables specify additional paths, as for :envvar:`CPATH`, which are
+  only used when processing the appropriate language.
+
+.. envvar:: MACOSX_DEPLOYMENT_TARGET
+
+  If :option:`-mmacosx-version-min` is unspecified, the default deployment
+  target is read from this environment variable. This option only affects
+  Darwin targets.
+
+BUGS
+----
+
+To report bugs, please visit <http://llvm.org/bugs/>.  Most bug reports should
+include preprocessed source files (use the :option:`-E` option) and the full
+output of the compiler, along with information to reproduce.
+
+SEE ALSO
+--------
+
+:manpage:`as(1)`, :manpage:`ld(1)`
+

docs/CommandGuide/index.rst

+Clang "man" pages
+-----------------
+
+The following documents are command descriptions for all of the Clang tools.
+These pages describe how to use the Clang commands and what their options are.
+Note that these pages do not describe all of the options available for all
+tools. To get a complete listing, pass the ``--help`` (general options) or
+``--help-hidden`` (general and debugging options) arguments to the tool you are
+interested in.
+
+Basic Commands
+~~~~~~~~~~~~~~
+
+.. toctree::
+   :maxdepth: 1
+
+   clang

docs/Makefile

 ##===- docs/Makefile ---------------------------------------*- Makefile -*-===##
 # 
 #                     The LLVM Compiler Infrastructure
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
 # 
 ##===----------------------------------------------------------------------===##
 
 CLANG_LEVEL := ..
-DIRS       := tools
 
 ifdef BUILD_FOR_WEBSITE
 PROJ_OBJ_DIR = .
 DOXYGEN = doxygen
 
 $(PROJ_OBJ_DIR)/doxygen.cfg: doxygen.cfg.in
   cat $< | sed \
     -e 's/@DOT@/dot/g' \

docs/conf.py

 # The encoding of source files.
 #source_encoding = 'utf-8-sig'
 
 # The master toctree document.
 master_doc = 'index'
 
 # General information about the project.
 project = u'Clang'
-copyright = u'2007-2014, The Clang Team'
+copyright = u'2007-2015, The Clang Team'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
 version = '3.7'
 # The full version, including alpha/beta/rc tags.

 # If false, no module index is generated.
 #latex_domain_indices = True
 
 
 # -- Options for manual page output --------------------------------------------
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [
-    ('index', 'clang', u'Clang Documentation',
-     [u'The Clang Team'], 1)
-]
+man_pages = []
+
+# Automatically derive the list of man pages from the contents of the command
+# guide subdirectory. This was copied from llvm/docs/conf.py.
+basedir = os.path.dirname(__file__)
+man_page_authors = u'Maintained by the Clang / LLVM Team (<http://clang.llvm.org>)'
+command_guide_subpath = 'CommandGuide'
+command_guide_path = os.path.join(basedir, command_guide_subpath)
+for name in os.listdir(command_guide_path):
+    # Ignore non-ReST files and the index page.
+    if not name.endswith('.rst') or name in ('index.rst',):
+        continue
+
+    # Otherwise, automatically extract the description.
+    file_subpath = os.path.join(command_guide_subpath, name)
+    with open(os.path.join(command_guide_path, name)) as f:
+        title = f.readline().rstrip('\n')
+        header = f.readline().rstrip('\n')
+
+        if len(header) != len(title):
+            print >>sys.stderr, (
+                "error: invalid header in %r (does not match title)" % (
+                    file_subpath,))
+        if ' - ' not in title:
+            print >>sys.stderr, (
+                ("error: invalid title in %r "
+                 "(expected '<name> - <description>')") % (
+                    file_subpath,))
+
+        # Split the name out of the title.
+        name,description = title.split(' - ', 1)
+        man_pages.append((file_subpath.replace('.rst',''), name,
+                          description, man_page_authors, 1))
+
 
 # If true, show URL addresses after external links.
 #man_show_urls = False
 
 
 # -- Options for Texinfo output ------------------------------------------------
 
 # Grouping the document tree into Texinfo files. List of tuples
 # (source start file, target name, title, author,

docs/index.rst

.. toctree::
    MemorySanitizer
    DataFlowSanitizer
    LeakSanitizer
    SanitizerCoverage
    SanitizerSpecialCaseList
    ControlFlowIntegrity
    Modules
    MSVCCompatibility
+   CommandGuide/index
    FAQ
 
 Using Clang as a Library
 ========================
 
 .. toctree::
    :maxdepth: 1
 

docs/tools/Makefile

-##===- docs/tools/Makefile ---------------------------------*- Makefile -*-===##
-# 
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-# 
-##===----------------------------------------------------------------------===##
-
-ifdef BUILD_FOR_WEBSITE
-
-# FIXME: This was copied from the CommandGuide makefile. Figure out
-# how to get this stuff on the website.
-
-# This special case is for keeping the CommandGuide on the LLVM web site
-# up to date automatically as the documents are checked in. It must build
-# the POD files to HTML only and keep them in the src directories. It must also
-# build in an unconfigured tree, hence the ifdef. To use this, run
-# make -s BUILD_FOR_WEBSITE=1 inside the cvs commit script.
-SRC_DOC_DIR=
-DST_HTML_DIR=html/
-DST_MAN_DIR=man/man1/
-DST_PS_DIR=ps/
-CLANG_VERSION := trunk
-
-# If we are in BUILD_FOR_WEBSITE mode, default to the all target.
-all:: html man ps
-
-clean:
-  rm -f pod2htm*.*~~ $(HTML) $(MAN) $(PS)
-
-# To create other directories, as needed, and timestamp their creation
-%/.dir:
-  -mkdir $* > /dev/null
-  date > $@
-
-else
-
-# Otherwise, if not in BUILD_FOR_WEBSITE mode, use the project info.
-CLANG_LEVEL := ../..
-include $(CLANG_LEVEL)/Makefile
-
-CLANG_VERSION := $(word 3,$(shell grep "CLANG_VERSION " \
-  $(PROJ_OBJ_DIR)/$(CLANG_LEVEL)/include/clang/Basic/Version.inc))
-
-SRC_DOC_DIR=$(PROJ_SRC_DIR)/
-DST_HTML_DIR=$(PROJ_OBJ_DIR)/
-DST_MAN_DIR=$(PROJ_OBJ_DIR)/
-DST_PS_DIR=$(PROJ_OBJ_DIR)/
-
-endif
-
-
-POD  := $(wildcard $(SRC_DOC_DIR)*.pod)
-HTML := $(patsubst $(SRC_DOC_DIR)%.pod, $(DST_HTML_DIR)%.html, $(POD))
-MAN  := $(patsubst $(SRC_DOC_DIR)%.pod, $(DST_MAN_DIR)%.1, $(POD))
-PS   := $(patsubst $(SRC_DOC_DIR)%.pod, $(DST_PS_DIR)%.ps, $(POD))
-
-ifdef ONLY_MAN_DOCS
-INSTALL_TARGETS := install-man
-else
-INSTALL_TARGETS := install-html install-man install-ps
-endif
-
-.SUFFIXES:
-.SUFFIXES: .html .pod .1 .ps
-
-$(DST_HTML_DIR)%.html: %.pod $(DST_HTML_DIR)/.dir
-  pod2html --css=manpage.css --htmlroot=. \
-    --podpath=. --infile=$< --outfile=$@ --title=$*
-
-$(DST_MAN_DIR)%.1: %.pod $(DST_MAN_DIR)/.dir
-  pod2man --release "clang $(CLANG_VERSION)" --center="Clang Tools Documentation" $< $@
-
-$(DST_PS_DIR)%.ps: $(DST_MAN_DIR)%.1 $(DST_PS_DIR)/.dir
-  groff -Tps -man $< > $@
-
-
-html: $(HTML)
-man: $(MAN)
-ps: $(PS)
-
-EXTRA_DIST := $(POD)
-
-clean-local::
-  $(Verb) $(RM) -f pod2htm*.*~~ $(HTML) $(MAN) $(PS)
-
-HTML_DIR := $(DESTDIR)$(PROJ_docsdir)/html/clang
-MAN_DIR  := $(DESTDIR)$(PROJ_mandir)/man1
-PS_DIR   := $(DESTDIR)$(PROJ_docsdir)/ps
-
-install-html:: $(HTML)
-  $(Echo) Installing HTML Clang Tools Documentation
-  $(Verb) $(MKDIR) $(HTML_DIR)
-  $(Verb) $(DataInstall) $(HTML) $(HTML_DIR)
-  $(Verb) $(DataInstall) $(PROJ_SRC_DIR)/manpage.css $(HTML_DIR)
-
-install-man:: $(MAN)
-  $(Echo) Installing MAN Clang Tools Documentation
-  $(Verb) $(MKDIR) $(MAN_DIR)
-  $(Verb) $(DataInstall) $(MAN) $(MAN_DIR)
-
-install-ps:: $(PS)
-  $(Echo) Installing PS Clang Tools Documentation
-  $(Verb) $(MKDIR) $(PS_DIR)
-  $(Verb) $(DataInstall) $(PS) $(PS_DIR)
-
-install-local:: $(INSTALL_TARGETS)
-
-uninstall-local::
-  $(Echo) Uninstalling Clang Tools Documentation
-  $(Verb) $(RM) -rf $(HTML_DIR) $(MAN_DIR) $(PS_DIR)
-
-printvars::
-  $(Echo) "POD            : " '$(POD)'
-  $(Echo) "HTML           : " '$(HTML)'

docs/tools/clang.pod

-=pod
-
-=head1 NAME
-
-clang - the Clang C, C++, and Objective-C compiler
-
-=head1 SYNOPSIS
-
-B<clang> [B<-c>|B<-S>|B<-E>] B<-std=>I<standard> B<-g>
-  [B<-O0>|B<-O1>|B<-O2>|B<-O3>|B<-Ofast>|B<-Os>|B<-Oz>|B<-O>|B<-O4>]
-  B<-W>I<warnings...> B<-pedantic>
-  B<-I>I<dir...> B<-L>I<dir...>
-  B<-D>I<macro[=defn]>
-  B<-f>I<feature-option...>
-  B<-m>I<machine-option...>
-  B<-o> I<output-file>
-  B<-stdlib=>I<library> 
-  I<input-filenames>
-
-=head1 DESCRIPTION
-
-B<clang> is a C, C++, and Objective-C compiler which encompasses preprocessing,
-parsing, optimization, code generation, assembly, and linking.  Depending on
-which high-level mode setting is passed, Clang will stop before doing a full
-link.  While Clang is highly integrated, it is important to understand the
-stages of compilation, to understand how to invoke it.  These stages are:
-
-=over
-
-=item B<Driver>
-
-The B<clang> executable is actually a small driver which controls the overall
-execution of other tools such as the compiler, assembler and linker.  Typically
-you do not need to interact with the driver, but you transparently use it to run
-the other tools.
-
-=item B<Preprocessing>
-
-This stage handles tokenization of the input source file, macro expansion,
-#include expansion and handling of other preprocessor directives.  The output of
-this stage is typically called a ".i" (for C), ".ii" (for C++), ".mi" (for 
-Objective-C) , or ".mii" (for Objective-C++) file.
-
-=item B<Parsing and Semantic Analysis>
-
-This stage parses the input file, translating preprocessor tokens into a parse
-tree.  Once in the form of a parser tree, it applies semantic analysis to compute
-types for expressions as well and determine whether the code is well formed. This
-stage is responsible for generating most of the compiler warnings as well as
-parse errors.  The output of this stage is an "Abstract Syntax Tree" (AST).
-
-=item B<Code Generation and Optimization>
-
-This stage translates an AST into low-level intermediate code (known as "LLVM
-IR") and ultimately to machine code.  This phase is responsible for optimizing
-the generated code and handling target-specific code generation.  The output of
-this stage is typically called a ".s" file or "assembly" file.
-
-Clang also supports the use of an integrated assembler, in which the code
-generator produces object files directly. This avoids the overhead of generating
-the ".s" file and of calling the target assembler.
-
-=item B<Assembler>
-
-This stage runs the target assembler to translate the output of the compiler
-into a target object file.  The output of this stage is typically called a ".o"
-file or "object" file.
-
-=item B<Linker>
-
-This stage runs the target linker to merge multiple object files into an
-executable or dynamic library.  The output of this stage is typically called an
-"a.out", ".dylib" or ".so" file.
-
-=back
-
-The Clang compiler supports a large number of options to control each of these
-stages.  In addition to compilation of code, Clang also supports other tools:
-
-B<Clang Static Analyzer>
-
-The Clang Static Analyzer is a tool that scans source code to try to find bugs
-through code analysis.  This tool uses many parts of Clang and is built into the
-same driver.  Please see L<http://clang-analyzer.llvm.org> for more details
-on how to use the static analyzer.
-
-
-=head1 OPTIONS
-
-=head2 Stage Selection Options
-
-=over
-
-=item B<-E>
-
-Run the preprocessor stage.
-
-=item B<-fsyntax-only>
-
-Run the preprocessor, parser and type checking stages.
-
-=item B<-S>
-
-Run the previous stages as well as LLVM generation and optimization stages and
-target-specific code generation, producing an assembly file.
-
-=item B<-c>
-
-Run all of the above, plus the assembler, generating a target ".o" object file.
-
-=item B<no stage selection option>
-
-If no stage selection option is specified, all stages above are run, and the
-linker is run to combine the results into an executable or shared library.
-
-=back
-
-
-
-=head2 Language Selection and Mode Options
-
-=over
-
-=item B<-x> I<language>
-
-Treat subsequent input files as having type I<language>.
-
-=item B<-std>=I<language>
-
-Specify the language standard to compile for.
-
-=item B<-stdlib>=I<library>
-
-Specify the C++ standard library to use; supported options are libstdc++ and
-libc++.
-
-=item B<-ansi>
-
-Same as B<-std=c89>.
-
-=item B<-ObjC++>
-
-Treat source input files as Objective-C++ inputs.
-
-=item B<-ObjC>
-
-Treat source input files as Objective-C inputs.
-
-=item B<-trigraphs>
-
-Enable trigraphs.
-
-=item B<-ffreestanding>
-
-Indicate that the file should be compiled for a freestanding, not a hosted,
-environment.
-
-=item B<-fno-builtin>
-
-Disable special handling and optimizations of builtin functions like strlen and
-malloc.
-
-=item B<-fmath-errno>
-
-Indicate that math functions should be treated as updating errno.
-
-=item B<-fpascal-strings>
-
-Enable support for Pascal-style strings with "\pfoo".
-
-=item B<-fms-extensions>
-
-Enable support for Microsoft extensions.
-
-=item B<-fmsc-version=>
-
-Set _MSC_VER. Defaults to 1300 on Windows. Not set otherwise.
-
-=item B<-fborland-extensions>
-
-Enable support for Borland extensions.
-
-=item B<-fwritable-strings>
-
-Make all string literals default to writable.  This disables uniquing of
-strings and other optimizations.
-
-=item B<-flax-vector-conversions>
-
-Allow loose type checking rules for implicit vector conversions.
-
-=item B<-fblocks>
-
-Enable the "Blocks" language feature.
-
-=item B<-fobjc-gc-only>
-
-Indicate that Objective-C code should be compiled in GC-only mode, which only
-works when Objective-C Garbage Collection is enabled.
-
-=item B<-fobjc-gc>
-
-Indicate that Objective-C code should be compiled in hybrid-GC mode, which works
-with both GC and non-GC mode.
-
-=item B<-fobjc-abi-version>=I<version>
-
-Select the Objective-C ABI version to use. Available versions are 1 (legacy
-"fragile" ABI), 2 (non-fragile ABI 1), and 3 (non-fragile ABI 2).
-
-=item B<-fobjc-nonfragile-abi-version>=I<version>
-
-Select the Objective-C non-fragile ABI version to use by default. This will only
-be used as the Objective-C ABI when the non-fragile ABI is enabled (either via
--fobjc-nonfragile-abi, or because it is the platform default).
-
-=item B<-fobjc-nonfragile-abi>
-
-Enable use of the Objective-C non-fragile ABI. On platforms for which this is
-the default ABI, it can be disabled with B<-fno-objc-nonfragile-abi>.
-
-=back
-
-
-
-=head2 Target Selection Options
-
-Clang fully supports cross compilation as an inherent part of its design.
-Depending on how your version of Clang is configured, it may have support for
-a number of cross compilers, or may only support a native target.
-
-=over
-
-=item B<-arch> I<architecture>
-
-Specify the architecture to build for.
-
-=item B<-mmacosx-version-min>=I<version>
-
-When building for Mac OS X, specify the minimum version supported by your
-application.
-
-=item B<-miphoneos-version-min>
-
-When building for iPhone OS, specify the minimum version supported by your
-application.
-
-
-=item B<-march>=I<cpu>
-
-Specify that Clang should generate code for a specific processor family member
-and later.  For example, if you specify -march=i486, the compiler is allowed to
-generate instructions that are valid on i486 and later processors, but which
-may not exist on earlier ones.
-
-=back
-
-
-=head2 Code Generation Options
-
-=over
-
-=item B<-O0> B<-O1> B<-O2> B<-O3> B<-Ofast> B<-Os> B<-Oz> B<-O> B<-O4>
-
-Specify which optimization level to use:
-
-=over
-
-=item B<-O0>
-
-Means "no optimization": this level compiles the fastest and
-generates the most debuggable code.
-
-=item B<-O1>
-
-Somewhere between B<-O0> and B<-O2>.
-
-=item B<-O2>
-
-Moderate level of optimization which enables most optimizations.
-
-=item B<-O3>
-
-Like B<-O2>, except that it enables optimizations that take longer to perform
-or that may generate larger code (in an attempt to make the program run faster).
-
-=item B<-Ofast>
-
-Enables all the optimizations from B<-O3> along with other aggressive
-optimizations that may violate strict compliance with language standards.
-
-=item B<-Os>
-
-Like B<-O2> with extra optimizations to reduce code size.
-
-=item B<-Oz>
-
-Like B<-Os> (and thus B<-O2>), but reduces code size further.
-
-=item B<-O>
-
-Equivalent to B<-O2>.
-
-=item B<-O4> and higher
-
-Currently equivalent to B<-O3>
-
-=back
-
-=item B<-g>
-
-Generate debug information.  Note that Clang debug information works best at
-B<-O0>.
-
-=item B<-fstandalone-debug> B<-fno-standalone-debug>
-
-Clang supports a number of optimizations to reduce the size of debug
-information in the binary. They work based on the assumption that the
-debug type information can be spread out over multiple compilation
-units.  For instance, Clang will not emit type definitions for types
-that are not needed by a module and could be replaced with a forward
-declaration.  Further, Clang will only emit type info for a dynamic
-C++ class in the module that contains the vtable for the class.
-
-The B<-fstandalone-debug> option turns off these optimizations.  This
-is useful when working with 3rd-party libraries that don't come with
-debug information.  This is the default on Darwin.  Note that Clang
-will never emit type information for types that are not referenced at
-all by the program.
-
-=item B<-fexceptions>
-
-Enable generation of unwind information, this allows exceptions to be thrown
-through Clang compiled stack frames.  This is on by default in x86-64.
-
-=item B<-ftrapv>
-
-Generate code to catch integer overflow errors.  Signed integer overflow is
-undefined in C, with this flag, extra code is generated to detect this and abort
-when it happens.
-
-
-=item B<-fvisibility>
-
-This flag sets the default visibility level.
-
-=item B<-fcommon>
-
-This flag specifies that variables without initializers get common linkage.  It
-can be disabled with B<-fno-common>.
-
-=item B<-ftls-model>
-
-Set the default thread-local storage (TLS) model to use for thread-local
-variables. Valid values are: "global-dynamic", "local-dynamic", "initial-exec"
-and "local-exec". The default is "global-dynamic". The default model can be
-overridden with the tls_model attribute. The compiler will try to choose a more
-efficient model if possible.
-
-=item B<-flto> B<-emit-llvm>
-
-Generate output files in LLVM formats, suitable for link time optimization. When
-used with B<-S> this generates LLVM intermediate language assembly files,
-otherwise this generates LLVM bitcode format object files (which may be passed
-to the linker depending on the stage selection options).
-
-=cut
-
-##=item B<-fnext-runtime> B<-fobjc-nonfragile-abi> B<-fgnu-runtime>
-##These options specify which Objective-C runtime the code generator should
-##target.  FIXME: we don't want people poking these generally.
-
-=pod
-
-=back
-
-
-=head2 Driver Options
-
-=over
-
-=item B<-###>
-
-Print (but do not run) the commands to run for this compilation.
-
-=item B<--help>
-
-Display available options.
-
-=item B<-Qunused-arguments>
-
-Don't emit warning for unused driver arguments.
-
-=item B<-Wa,>I<args>
-
-Pass the comma separated arguments in I<args> to the assembler.
-
-=item B<-Wl,>I<args>
-
-Pass the comma separated arguments in I<args> to the linker.
-
-=item B<-Wp,>I<args>
-
-Pass the comma separated arguments in I<args> to the preprocessor.
-
-=item B<-Xanalyzer> I<arg>
-
-Pass I<arg> to the static analyzer.
-
-=item B<-Xassembler> I<arg>
-
-Pass I<arg> to the assembler.
-
-=item B<-Xlinker> I<arg>
-
-Pass I<arg> to the linker.
-
-=item B<-Xpreprocessor> I<arg>
-
-Pass I<arg> to the preprocessor.
-
-=item B<-o> I<file>
-
-Write output to I<file>.
-
-=item B<-print-file-name>=I<file>
-
-Print the full library path of I<file>.
-
-=item B<-print-libgcc-file-name>
-
-Print the library path for "libgcc.a".
-
-=item B<-print-prog-name>=I<name>
-
-Print the full program path of I<name>.
-
-=item B<-print-search-dirs>
-
-Print the paths used for finding libraries and programs.
-
-=item B<-save-temps>
-
-Save intermediate compilation results.
-
-=item B<-integrated-as> B<-no-integrated-as>
-
-Used to enable and disable, respectively, the use of the integrated
-assembler. Whether the integrated assembler is on by default is target
-dependent.
-
-=item B<-time>
-
-Time individual commands.
-
-=item B<-ftime-report>
-
-Print timing summary of each stage of compilation.
-
-=item B<-v>
-
-Show commands to run and use verbose output.
-
-=back
-
-
-=head2 Diagnostics Options
-
-=over
-
-=item B<-fshow-column>
-B<-fshow-source-location>
-B<-fcaret-diagnostics>
-B<-fdiagnostics-fixit-info>
-B<-fdiagnostics-parseable-fixits>
-B<-fdiagnostics-print-source-range-info>
-B<-fprint-source-range-info>
-B<-fdiagnostics-show-option>
-B<-fmessage-length>
-
-These options control how Clang prints out information about diagnostics (errors
-and warnings).  Please see the Clang User's Manual for more information.
-
-=back
-
-
-=head2 Preprocessor Options
-
-=over
-
-=item B<-D>I<macroname=value>
-
-Adds an implicit #define into the predefines buffer which is read before the
-source file is preprocessed.
-
-=item B<-U>I<macroname>
-
-Adds an implicit #undef into the predefines buffer which is read before the
-source file is preprocessed.
-
-=item B<-include> I<filename>
-
-Adds an implicit #include into the predefines buffer which is read before the
-source file is preprocessed.
-
-=item B<-I>I<directory>
-
-Add the specified directory to the search path for include files.
-
-=item B<-F>I<directory>
-
-Add the specified directory to the search path for framework include files.
-
-=item B<-nostdinc>
-
-Do not search the standard system directories or compiler builtin directories
-for include files.
-
-=item B<-nostdlibinc>
-
-Do not search the standard system directories for include files, but do search
-compiler builtin include directories.
-
-=item B<-nobuiltininc>
-
-Do not search clang's builtin directory for include files.
-
-=cut
-
-## TODO, but do we really want people using this stuff?
-#=item B<-idirafter>I<directory>
-#=item B<-iquote>I<directory>
-#=item B<-isystem>I<directory>
-#=item B<-iprefix>I<directory>
-#=item B<-iwithprefix>I<directory>
-#=item B<-iwithprefixbefore>I<directory>
-#=item B<-isysroot>
-
-=pod
-
-
-=back
-
-
-
-=cut
-
-### TODO someday.
-#=head2 Warning Control Options
-#=over
-#=back
-#=head2 Code Generation and Optimization Options
-#=over
-#=back
-#=head2 Assembler Options
-#=over
-#=back
-#=head2 Linker Options
-#=over
-#=back
-#=head2 Static Analyzer Options
-#=over
-#=back
-
-=pod
-
-
-=head1 ENVIRONMENT
-
-=over
-
-=item B<TMPDIR>, B<TEMP>, B<TMP>
-
-These environment variables are checked, in order, for the location to
-write temporary files used during the compilation process.
-
-=item B<CPATH>
-
-If this environment variable is present, it is treated as a delimited
-list of paths to be added to the default system include path list. The
-delimiter is the platform dependent delimitor, as used in the I<PATH>
-environment variable.
-
-Empty components in the environment variable are ignored.
-
-=item B<C_INCLUDE_PATH>, B<OBJC_INCLUDE_PATH>, B<CPLUS_INCLUDE_PATH>,
-B<OBJCPLUS_INCLUDE_PATH>
-
-These environment variables specify additional paths, as for CPATH,
-which are only used when processing the appropriate language.
-
-=item B<MACOSX_DEPLOYMENT_TARGET>
-
-If -mmacosx-version-min is unspecified, the default deployment target
-is read from this environment variable.  This option only affects darwin
-targets.
-
-=back
-
-=head1 BUGS
-
-To report bugs, please visit L<http://llvm.org/bugs/>.  Most bug reports should
-include preprocessed source files (use the B<-E> option) and the full output of 
-the compiler, along with information to reproduce.
-
-=head1 SEE ALSO
-
- as(1), ld(1)
-
-=head1 AUTHOR
-
-Maintained by the Clang / LLVM Team (L<http://clang.llvm.org>).
-
-=cut

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