[libc++] Explicitly provide a list of exported symbols for libc++

[ldionne]

Summary

Controlling what symbols are exported using visibility annotations at
the source level doesn't work very well, because those annotations are
non-standard. The annotations differ subtly from compiler to compiler,
and as a result it's difficult to obtain the same ABI using all compilers.
By defining an explicit list of symbols, we control exactly which symbols
are exported in all cases and we can eventually get rid of visibility
annotations in the source.

Note that this commit only provides such explicit control when building
on Apple platforms. Support for Linux will be coming later.

[ldionne]

Work on this patch was prompted by the CI breakage on GCC caused by https://reviews.llvm.org/D62868. Because the build bots using GCC are on Linux, and this patch removes -fvisibility=hidden when building on Linux, it will silence the CI failures as a side effect.

However, in the future, we can add a similar list using linker version files for Linux, which should work with both GCC and Clang (because it's linker specific anyway).

[ldionne]

Use some wildcards to make the list work in 32 bit mode, where ptrdiff_t is
int instead of long

[mclow.lists]

I see maintaining an explicit list of exports as an ongoing time sink - are you sure this is the the direction that we want to take?

[ldionne]

In D66970#1657660, @mclow.lists wrote:

I see maintaining an explicit list of exports as an ongoing time sink - are you sure this is the the direction that we want to take?

This list only contains symbols that we want to export from the dylib, not all symbols. And we already need to update the ABI list (so it passes the check-cxx-abilist test) whenever we add a new symbol to the dylib. So I think this isn't going to be a huge time sink on top of what we already do, but I could be wrong. On the other hand, it has the benefit that we will be able to remove all visibility annotations from the libc++ sources.

[zoecarver]

In D66970#1657660, @mclow.lists wrote:

I see maintaining an explicit list of exports as an ongoing time sink - are you sure this is the the direction that we want to take?

We can probably automate the creation of this list. Maybe we could add it to CI?

[ldionne]

In D66970#1657905, @zoecarver wrote:

In D66970#1657660, @mclow.lists wrote:

I see maintaining an explicit list of exports as an ongoing time sink - are you sure this is the the direction that we want to take?

We can probably automate the creation of this list. Maybe we could add it to CI?

I don't think we want to automate it. The very purpose is to have _explicit_ control over symbols that we export. That way, we do not end up exporting symbols that we wish we did not export.

When a vendor exports a symbols from the dylib, it needs to export it for ever.

[compnerd]

I think that controlling via annotations is actually very useful. It will actually still be needed to ensure that libc++ continues to build on Windows properly (which really does want the annotations). The annotations being applied there makes it easy to then handle properly on the other platforms as well. Additionally, diffs explicitly call out the interface in the change, which again helps review the changes. Finally, there are some symbols which are synthesized by the compiler and the visibility for those are controlled by means of the annotation on the associated class. This again is far easier to manage with the explicit annotation rather than the explicit export list.

[ldionne]

I'm not sure this is the best idea anymore. It's especially difficult to maintain this when targeting different architectures, etc. Abandoning.

libcxx/lib/libc++.exp

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+__ZTINSt3__19__num_getIwEE
+__ZTINSt3__19__num_putIcEE
+__ZTINSt3__19__num_putIwEE
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+__ZTINSt3__19basic_iosIwNS_11char_traitsIwEEEE
+__ZTINSt3__19money_getIcNS_19istreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTINSt3__19money_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTINSt3__19money_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTINSt3__19money_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTINSt3__19strstreamE
+__ZTINSt3__19time_baseE
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+__ZTISt11range_error
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+__ZTISt12domain_error
+__ZTISt12length_error
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+__ZTISt13bad_exception
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+__ZTISt14overflow_error
+__ZTISt15underflow_error
+__ZTISt16invalid_argument
+__ZTISt16nested_exception
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+__ZTISt19bad_optional_access
+__ZTISt20bad_array_new_length
+__ZTISt8bad_cast
+__ZTISt9bad_alloc
+__ZTISt9exception
+__ZTISt9type_info
+__ZTSDi
+__ZTSDn
+__ZTSDs
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+__ZTSNSt12experimental19bad_optional_accessE
+__ZTSNSt3__110ctype_baseE
+__ZTSNSt3__110istrstreamE
+__ZTSNSt3__110money_baseE
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+__ZTSNSt3__112codecvt_baseE
+__ZTSNSt3__112ctype_bynameIcEE
+__ZTSNSt3__112ctype_bynameIwEE
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+__ZTSNSt3__112strstreambufE
+__ZTSNSt3__112system_errorE
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+__ZTSNSt3__113basic_istreamIwNS_11char_traitsIwEEEE
+__ZTSNSt3__113basic_ostreamIcNS_11char_traitsIcEEEE
+__ZTSNSt3__113basic_ostreamIwNS_11char_traitsIwEEEE
+__ZTSNSt3__113messages_baseE
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+__ZTSNSt3__19__num_getIcEE
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+__ZTSNSt3__19basic_iosIwNS_11char_traitsIwEEEE
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+__ZTSNSt3__19money_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTSNSt3__19money_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTSNSt3__19strstreamE
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+__ZTVNSt3__114__codecvt_utf8IDiEE
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+__ZTVNSt3__114__codecvt_utf8IwEE
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+__ZTVNSt3__115basic_streambufIwNS_11char_traitsIwEEEE
+__ZTVNSt3__115messages_bynameIcEE
+__ZTVNSt3__115messages_bynameIwEE
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+__ZTVNSt3__115numpunct_bynameIwEE
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+__ZTVNSt3__115time_get_bynameIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__115time_put_bynameIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTVNSt3__115time_put_bynameIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__116__narrow_to_utf8ILm16EEE
+__ZTVNSt3__116__narrow_to_utf8ILm32EEE
+__ZTVNSt3__117__assoc_sub_stateE
+__ZTVNSt3__117__widen_from_utf8ILm16EEE
+__ZTVNSt3__117__widen_from_utf8ILm32EEE
+__ZTVNSt3__117moneypunct_bynameIcLb0EEE
+__ZTVNSt3__117moneypunct_bynameIcLb1EEE
+__ZTVNSt3__117moneypunct_bynameIwLb0EEE
+__ZTVNSt3__117moneypunct_bynameIwLb1EEE
+__ZTVNSt3__119__shared_weak_countE
+__ZTVNSt3__120__codecvt_utf8_utf16IDiEE
+__ZTVNSt3__120__codecvt_utf8_utf16IDsEE
+__ZTVNSt3__120__codecvt_utf8_utf16IwEE
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+__ZTVNSt3__15ctypeIcEE
+__ZTVNSt3__15ctypeIwEE
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+__ZTVNSt3__17codecvtIDic11__mbstate_tEE
+__ZTVNSt3__17codecvtIDsc11__mbstate_tEE
+__ZTVNSt3__17codecvtIcc11__mbstate_tEE
+__ZTVNSt3__17codecvtIwc11__mbstate_tEE
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+__ZTVNSt3__17collateIwEE
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+__ZTVNSt3__17num_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__17num_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTVNSt3__17num_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__18__c_nodeE
+__ZTVNSt3__18ios_base7failureE
+__ZTVNSt3__18ios_baseE
+__ZTVNSt3__18messagesIcEE
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+__ZTVNSt3__18numpunctIwEE
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+__ZTVNSt3__18time_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__18time_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTVNSt3__18time_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__19basic_iosIcNS_11char_traitsIcEEEE
+__ZTVNSt3__19basic_iosIwNS_11char_traitsIwEEEE
+__ZTVNSt3__19money_getIcNS_19istreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTVNSt3__19money_getIwNS_19istreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__19money_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
+__ZTVNSt3__19money_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
+__ZTVNSt3__19strstreamE
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+__ZTVSt12bad_any_cast
+__ZTVSt12domain_error
+__ZTVSt12length_error
+__ZTVSt12out_of_range
+__ZTVSt13bad_exception
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+__ZTVSt14overflow_error
+__ZTVSt15underflow_error
+__ZTVSt16invalid_argument
+__ZTVSt16nested_exception
+__ZTVSt18bad_variant_access
+__ZTVSt19bad_optional_access
+__ZTVSt20bad_array_new_length
+__ZTVSt8bad_cast
+__ZTVSt9bad_alloc
+__ZTVSt9exception
+__ZTVSt9type_info
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+__ZThn16_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev
+__ZThn16_NSt3__19strstreamD0Ev
+__ZThn16_NSt3__19strstreamD1Ev
+__ZTv0_n24_NSt3__110istrstreamD0Ev
+__ZTv0_n24_NSt3__110istrstreamD1Ev
+__ZTv0_n24_NSt3__110ostrstreamD0Ev
+__ZTv0_n24_NSt3__110ostrstreamD1Ev
+__ZTv0_n24_NSt3__113basic_istreamIcNS_11char_traitsIcEEED0Ev
+__ZTv0_n24_NSt3__113basic_istreamIcNS_11char_traitsIcEEED1Ev
+__ZTv0_n24_NSt3__113basic_istreamIwNS_11char_traitsIwEEED0Ev
+__ZTv0_n24_NSt3__113basic_istreamIwNS_11char_traitsIwEEED1Ev
+__ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED0Ev
+__ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED1Ev
+__ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED0Ev
+__ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED1Ev
+__ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev
+__ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev
+__ZTv0_n24_NSt3__19strstreamD0Ev
+__ZTv0_n24_NSt3__19strstreamD1Ev
+___cxa_bad_cast
+___cxa_bad_typeid
+___cxa_throw_bad_array_new_length
+___cxa_uncaught_exceptions

libcxx/lib/libc++unexp.exp

-# all guard variables
-__ZGVNSt3__*
-# all vtables
-# __ZTV*
-# all VTT
-# __ZTT*
-# all non-virtual thunks
-# __ZTh*
-# all virtual thunks
-# __ZTv*
-# typeinfo for std::__1::__types
-#    There are no std::__types
-# __ZTINSt3__1[0-9][0-9]*__*
-# typeinfo name for std::__1::__types
-__ZTSNSt3__1[0-9][0-9]*__*
-# anything using __hidden_allocator
-*__hidden_allocator*
-# anything using __sso_allocator
-*__sso_allocator*

libcxx/src/CMakeLists.txt

 if (LIBCXX_ENABLE_PARALLEL_ALGORITHMS AND NOT TARGET pstl::ParallelSTL)
   message(FATAL_ERROR "Could not find ParallelSTL")
 endif()
 
 function(cxx_set_common_defines name)
   if(LIBCXX_CXX_ABI_HEADER_TARGET)
     add_dependencies(${name} ${LIBCXX_CXX_ABI_HEADER_TARGET})
   endif()
-  target_compile_options(${name} PRIVATE -fvisibility=hidden)
   if(WIN32 AND NOT MINGW)
     target_compile_definitions(${name}
                                PRIVATE
                                  # Ignore the -MSC_VER mismatch, as we may build
                                  # with a different compatibility version.
                                  _ALLOW_MSC_VER_MISMATCH
                                  # Don't check the msvcprt iterator debug levels
                                  # as we will define the iterator types; libc++
if (LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY)
     else()
       target_link_libraries(cxx_shared PRIVATE "-Wl,--whole-archive,-Bstatic" "${LIBCXX_CXX_STATIC_ABI_LIBRARY}" "-Wl,-Bdynamic,--no-whole-archive")
     endif()
   else()
     target_link_libraries(cxx_shared PUBLIC "${LIBCXX_CXX_SHARED_ABI_LIBRARY}")
     list(APPEND LIBCXX_INTERFACE_LIBRARIES "${LIBCXX_CXX_SHARED_ABI_LIBRARY}") # For the linker script
   endif()
 
+  # Determine which symbols we export from the shared library. All other
+  # symbols are private to the shared library (they have hidden visibility).
+  #
+  # TODO: On Linux, we can do the same with a linker version script.
+  if (APPLE)
+    target_compile_options(cxx_shared PRIVATE -fvisibility=hidden)
+    target_link_libraries(cxx_shared PRIVATE "-Wl,-exported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++.exp")
+    target_link_libraries(cxx_shared PRIVATE "-Wl,-exported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi-new-delete.exp")
+
     # Maybe re-export symbols from libc++abi
-  if (APPLE AND (LIBCXX_CXX_ABI_LIBNAME STREQUAL "libcxxabi" OR
-                 LIBCXX_CXX_ABI_LIBNAME STREQUAL "default")
-            AND NOT DEFINED LIBCXX_OSX_REEXPORT_LIBCXXABI_SYMBOLS)
+    if ((LIBCXX_CXX_ABI_LIBNAME STREQUAL "libcxxabi" OR
       set(LIBCXX_OSX_REEXPORT_LIBCXXABI_SYMBOLS ON)
     endif()
 
     if (LIBCXX_OSX_REEXPORT_LIBCXXABI_SYMBOLS)
       if ("${CMAKE_OSX_ARCHITECTURES}" MATCHES "^(armv6|armv7|armv7s)$")
         set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++sjlj-abi.v${LIBCXX_LIBCPPABI_VERSION}.exp")
       else()
         set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi.v${LIBCXX_LIBCPPABI_VERSION}.exp")
       endif()
+      target_link_libraries(cxx_shared PRIVATE "-Wl,-exported_symbols_list,${RE_EXPORT_LIST}")
+    endif()
+
+    # Set the right strength for symbols
     target_link_libraries(cxx_shared PRIVATE
-      "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++unexp.exp"
-      "-Wl,-reexported_symbols_list,${RE_EXPORT_LIST}"
       "-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/notweak.exp"
       "-Wl,-force_symbols_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/weak.exp")
-
-    if (NOT LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS)
-      target_link_libraries(cxx_shared PRIVATE "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi-new-delete.exp")
-    endif()
   endif()
 
   # Generate a linker script in place of a libc++.so symlink. Rerun this command
   # after cxx builds.
   if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
     # Get the name of the ABI library and handle the case where CXXABI_LIBNAME
     # is a target name and not a library. Ex cxxabi_shared.
     set(LIBCXX_INTERFACE_LIBRARY_NAMES)