[libc++][CMake] Clean up some of the libc++ re-exporting logic

[ldionne]

Summary

This change allows specifying the version of libc++abi's ABI to re-export
when configuring CMake. It also clearly identifies which ABI version of
libc++abi each export file contains.

Finally, it removes hardcoded knowledge about the 10.9 SDK for MacOS,
since that knowledge is not relevant anymore. Indeed, libc++ can't be
built with the toolchain that came with the 10.9 SDK anyway because
the version of Clang it includes is too old (for example if you want
to build a working libc++.dylib, you need bugfixes to visibility
attributes that are only in recent Clangs).

[dexonsmith]

LGTM.

CMakeLists.txt

 set(LIBCXX_ABI_VERSION "1" CACHE STRING "ABI version of libc++. Can be either 1 or 2, where 2 is currently not stable. Defaults to 1.")
 set(LIBCXX_ABI_NAMESPACE "" CACHE STRING "The inline ABI namespace used by libc++. It defaults to __n where `n` is the current ABI version.")
 option(LIBCXX_ABI_UNSTABLE "Unstable ABI of libc++." OFF)
 option(LIBCXX_ABI_FORCE_ITANIUM "Ignore auto-detection and force use of the Itanium ABI.")
 option(LIBCXX_ABI_FORCE_MICROSOFT "Ignore auto-detection and force use of the Microsoft ABI.")
 option(LIBCXX_HIDE_FROM_ABI_PER_TU_BY_DEFAULT "Enable per TU ABI insulation by default. To be used by vendors." OFF)
 set(LIBCXX_ABI_DEFINES "" CACHE STRING "A semicolon separated list of ABI macros to define in the site config header.")
 option(LIBCXX_USE_COMPILER_RT "Use compiler-rt instead of libgcc" OFF)
+set(LIBCXX_LIBCPPABI_VERSION "2" CACHE STRING "Version of libc++abi's ABI to re-export from libc++ when re-exporting is enabled.
+                                               Note that this is not related to the version of libc++'s ABI itself!")
 
 if (NOT LIBCXX_ENABLE_SHARED AND NOT LIBCXX_ENABLE_STATIC)
   message(FATAL_ERROR "libc++ must be built as either a shared or static library.")
 endif()
 
 # ABI Library options ---------------------------------------------------------
 set(LIBCXX_CXX_ABI "default" CACHE STRING
     "Specify C++ ABI library to use.")

cmake/Modules/HandleLibCXXABI.cmake

 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi")
   if (LIBCXX_CXX_ABI_INTREE)
     # Link against just-built "cxxabi" target.
     if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
       set(CXXABI_LIBNAME cxxabi_static)
     else()
       set(CXXABI_LIBNAME cxxabi_shared)
     endif()
-    set(LIBCXX_LIBCPPABI_VERSION "2" PARENT_SCOPE)
   else()
     # Assume c++abi is installed in the system, rely on -lc++abi link flag.
     set(CXXABI_LIBNAME "c++abi")
   endif()
   set(HEADERS "cxxabi.h;__cxxabi_config.h")
   if (LIBCXX_CXX_ABI_SYSTEM)
     set(HEADERS "")
   endif()

docs/index.rst

 
 Notes and Known Issues
 ----------------------
 
 This list contains known issues with libc++
 
 * Building libc++ with ``-fno-rtti`` is not supported. However
   linking against it with ``-fno-rtti`` is supported.
-* On OS X v10.8 and older the CMake option ``-DLIBCXX_LIBCPPABI_VERSION=""``
-  must be used during configuration.
 
 
 A full list of currently open libc++ bugs can be `found here`__.
 
 .. __:  https://bugs.llvm.org/buglist.cgi?component=All%20Bugs&product=libc%2B%2B&query_format=advanced&resolution=---&order=changeddate%20DESC%2Cassigned_to%20DESC%2Cbug_status%2Cpriority%2Cbug_id&list_id=74184
 
 Design Documents
 ----------------

lib/CMakeLists.txt

if (LIBCXX_TARGETING_MSVC)
   add_library_flags(msvcrt${LIB_SUFFIX}) # C runtime startup files
   add_library_flags(msvcprt${LIB_SUFFIX}) # C++ standard library. Required for exception_ptr internals.
   # Required for standards-complaint wide character formatting functions
   # (e.g. `printfw`/`scanfw`)
   add_library_flags(iso_stdio_wide_specifiers)
 endif()
 
 if (LIBCXX_OSX_REEXPORT_LIBCXXABI_SYMBOLS)
-  if (NOT DEFINED LIBCXX_LIBCPPABI_VERSION)
-    set(LIBCXX_LIBCPPABI_VERSION "2") # Default value
-    execute_process(
-      COMMAND xcrun --show-sdk-version
-      OUTPUT_VARIABLE sdk_ver
-      RESULT_VARIABLE res
-      OUTPUT_STRIP_TRAILING_WHITESPACE)
-    if (res EQUAL 0)
-      message(STATUS "Found SDK version ${sdk_ver}")
-      string(REPLACE "10." "" sdk_ver "${sdk_ver}")
-      if (sdk_ver LESS 9)
-        set(LIBCXX_LIBCPPABI_VERSION "")
-      else()
-        set(LIBCXX_LIBCPPABI_VERSION "2")
-      endif()
-    endif()
-  endif()
-
   if ("armv7" IN_LIST CMAKE_OSX_ARCHITECTURES)
-    set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/libc++sjlj-abi.exp")
+    set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/libc++sjlj-abi.v${LIBCXX_LIBCPPABI_VERSION}.exp")
   else()
-    set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/libc++abi${LIBCXX_LIBCPPABI_VERSION}.exp")
+    set(RE_EXPORT_LIST "${CMAKE_CURRENT_SOURCE_DIR}/libc++abi.v${LIBCXX_LIBCPPABI_VERSION}.exp")
   endif()
   add_link_flags(
     "-compatibility_version 1"
     "-install_name /usr/lib/libc++.1.dylib"
     "-Wl,-unexported_symbols_list,\"${CMAKE_CURRENT_SOURCE_DIR}/libc++unexp.exp\""
     "-Wl,-reexported_symbols_list,\"${RE_EXPORT_LIST}\""
     "-Wl,-force_symbols_not_weak_list,\"${CMAKE_CURRENT_SOURCE_DIR}/notweak.exp\""
     "-Wl,-force_symbols_weak_list,\"${CMAKE_CURRENT_SOURCE_DIR}/weak.exp\"")

lib/libc++abi.exp

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www/index.html

<div id="content">
   <!--=====================================================================-->
 
   <p>
     <ul>
       <li>
         Building libc++ with <code>-fno-rtti</code> is not supported. However
         linking against it with <code>-fno-rtti</code> is supported.
       </li>
-      <li>
-        On OS X v10.8 and older the CMake option
-        <code>-DLIBCXX_LIBCPPABI_VERSION=""</code> must be used during
-        configuration.
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     </ul>
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