# 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if(HAVE_LTO) target_compile_options(${TargetName} PRIVATE -flto -fprofile-instr-use=${ProfilePath} -Wno-profile-instr-out-of-date -Wno-profile-instr-unprofiled) set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS " -flto -fuse-ld=gold -fprofile-instr-use=${ProfilePath}")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)