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# Adds Profile Guided Optimization (PGO) flags to the current target
function(add_pgo TargetName)
if(WIN32)
set(ProfileFileName "${TargetName}.pgd")
else(WIN32)
set(ProfileFileName "${TargetName}.profdata")
endif(WIN32)
set(CLR_CMAKE_OPTDATA_PACKAGEWITHRID "optimization.${CLR_CMAKE_TARGET_OS}-${CLR_CMAKE_TARGET_ARCH}.PGO.CoreCLR")
# On case-sensitive file systems, NuGet packages are restored to lowercase paths
string(TOLOWER "${CLR_CMAKE_OPTDATA_PACKAGEWITHRID}/${CLR_CMAKE_OPTDATA_VERSION}" OptDataVersionedSubPath)
file(TO_NATIVE_PATH
"${CLR_CMAKE_PACKAGES_DIR}/${OptDataVersionedSubPath}/data/${ProfileFileName}"
ProfilePath
)
if(CLR_CMAKE_PGO_INSTRUMENT)
if(WIN32)
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS_RELEASE " /LTCG /GENPROFILE")
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS_RELWITHDEBINFO " /LTCG /GENPROFILE")
else(WIN32)
if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
target_compile_options(${TargetName} PRIVATE -flto -fprofile-instr-generate)
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS " -flto -fuse-ld=gold -fprofile-instr-generate")
endif(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
endif(WIN32)
elseif(CLR_CMAKE_PGO_OPTIMIZE)
# If we don't have profile data availble, gracefully fall back to a non-PGO opt build
if(EXISTS ${ProfilePath})
if(WIN32)
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS_RELEASE " /LTCG /USEPROFILE:PGD=${ProfilePath}")
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS_RELWITHDEBINFO " /LTCG /USEPROFILE:PGD=${ProfilePath}")
else(WIN32)
if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.6)
if(HAVE_LTO)
target_compile_options(${TargetName} PRIVATE -flto -fprofile-instr-use=${ProfilePath} -Wno-profile-instr-out-of-date -Wno-profile-instr-unprofiled)
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS " -flto -fuse-ld=gold -fprofile-instr-use=${ProfilePath}")
else(HAVE_LTO)
message(WARNING "LTO is not supported, skipping profile guided optimizations")
endif(HAVE_LTO)
else(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.6)
message(WARNING "PGO is not supported; Clang 3.6 or later is required for profile guided optimizations")
endif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.6)
endif(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
endif(WIN32)
endif(EXISTS ${ProfilePath})
endif(CLR_CMAKE_PGO_INSTRUMENT)
endfunction(add_pgo)
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