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cmake: Configure the ThinLTO cache directory when using ELF lld or gold.

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Differential Revision: https://reviews.llvm.org/D30522

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296730 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2017-03-02 03:01:12 +00:00
parent cc5ba4427e
commit 4dc7365813
1 changed files with 14 additions and 5 deletions
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19
cmake/modules/HandleLLVMOptions.cmake
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@ -715,11 +715,20 @@ if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
if(NOT LINKER_IS_LLD_LINK)
append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
# On darwin, enable the lto cache. This improves initial build time a little
# since we re-link a lot of the same objects, and significantly improves
# incremental build time.
append_if(APPLE "-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
# If the linker supports it, enable the lto cache. This improves initial build
# time a little since we re-link a lot of the same objects, and significantly
# improves incremental build time.
# FIXME: We should move all this logic into the clang driver.
if(APPLE)
append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(UNIX AND LLVM_USE_LINKER STREQUAL "lld")
append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(LLVM_USE_LINKER STREQUAL "gold")
append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")
append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
if(NOT LINKER_IS_LLD_LINK)