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[CMake][Release] Build with -ffat-lto-objects (#140381)

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Fixes #133580
This commit is contained in:
Tom Stellard 2025-07-29 15:33:49 -07:00 committed by GitHub
parent d99238263c
commit cff9ae7a15
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GPG Key ID: B5690EEEBB952194
2 changed files with 10 additions and 1 deletions
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6
clang/cmake/caches/Release.cmake
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@ -102,7 +102,7 @@ if (LLVM_RELEASE_ENABLE_LTO)
# FIXME: We can't use LLVM_ENABLE_LTO=Thin here, because it causes the CMake
# step for the libcxx build to fail. CMAKE_INTERPROCEDURAL_OPTIMIZATION does
# enable ThinLTO, though.
set(RUNTIMES_CMAKE_ARGS "-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON -DLLVM_ENABLE_LLD=ON" CACHE STRING "")
set(RUNTIMES_CMAKE_ARGS "-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON -DLLVM_ENABLE_LLD=ON -DLLVM_ENABLE_FATLTO=ON" CACHE STRING "")
endif()
# Stage 1 Common Config
@ -144,3 +144,7 @@ set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
set_final_stage_var(CPACK_ARCHIVE_THREADS "0" STRING)
set_final_stage_var(LLVM_USE_STATIC_ZSTD "ON" BOOL)
if (LLVM_RELEASE_ENABLE_LTO)
set_final_stage_var(LLVM_ENABLE_FATLTO "ON" BOOL)
set_final_stage_var(CPACK_PRE_BUILD_SCRIPTS "${CMAKE_CURRENT_LIST_DIR}/release_cpack_pre_build_strip_lto.cmake" STRING)
endif()

5
clang/cmake/caches/release_cpack_pre_build_strip_lto.cmake Normal file
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@ -0,0 +1,5 @@
file(GLOB files ${CPACK_TEMPORARY_INSTALL_DIRECTORY}/lib/*.a)
foreach(file ${files})
execute_process(COMMAND ${CPACK_TEMPORARY_INSTALL_DIRECTORY}/bin/llvm-strip --no-strip-all -R .llvm.lto ${file})
endforeach()