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MSVC,Clang,Flang: Add IPO support

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Fixes: #17692
This commit is contained in:
xoviat
2018-01-30 13:34:02 -06:00
committed by Brad King
parent b89252689c
commit a18147e933
1 changed files with 28 additions and 0 deletions
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28
Modules/Platform/Windows-MSVC.cmake
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@@ -293,6 +293,34 @@ macro(__windows_compiler_msvc lang)
set(CMAKE_${lang}_LINK_EXECUTABLE
"${_CMAKE_VS_LINK_EXE}<CMAKE_LINKER> ${CMAKE_CL_NOLOGO} <OBJECTS> ${CMAKE_START_TEMP_FILE} /out:<TARGET> /implib:<TARGET_IMPLIB> /pdb:<TARGET_PDB> /version:<TARGET_VERSION_MAJOR>.<TARGET_VERSION_MINOR>${_PLATFORM_LINK_FLAGS} <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES>${CMAKE_END_TEMP_FILE}")
if("x${CMAKE_${lang}_COMPILER_ID}" STREQUAL "xMSVC")
set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "/GL")
set(CMAKE_${lang}_LINK_OPTIONS_IPO "/INCREMENTAL:NO" "/LTCG")
string(REPLACE "<LINK_FLAGS> " "/LTCG <LINK_FLAGS> "
CMAKE_${lang}_CREATE_STATIC_LIBRARY_IPO "${CMAKE_${lang}_CREATE_STATIC_LIBRARY}")
elseif("x${CMAKE_${lang}_COMPILER_ID}" STREQUAL "xClang" OR
"x${CMAKE_${lang}_COMPILER_ID}" STREQUAL "xFlang")
set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
# '-flto=thin' available since Clang 3.9 and Xcode 8
# * http://clang.llvm.org/docs/ThinLTO.html#clang-llvm
# * https://trac.macports.org/wiki/XcodeVersionInfo
set(_CMAKE_LTO_THIN TRUE)
if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.9)
set(_CMAKE_LTO_THIN FALSE)
endif()
if(_CMAKE_LTO_THIN)
set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "-flto=thin")
else()
set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "-flto")
endif()
endif()
if("x${lang}" STREQUAL "xC" OR
"x${lang}" STREQUAL "xCXX")
if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "v[0-9]+_clang_.*")