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include(CheckCXXSourceCompiles)
include(CheckCXXCompilerFlag)
# VC++ guarantees support for LTCG (LTO's equivalent)
if(NOT WIN32)
# Function required to give CMAKE_REQUIRED_* local scope
function(check_have_lto)
set(CMAKE_REQUIRED_FLAGS -flto)
set(CMAKE_REQUIRED_LIBRARIES -flto -fuse-ld=gold)
check_cxx_source_compiles("int main() { return 0; }" HAVE_LTO)
endfunction(check_have_lto)
check_have_lto()
check_cxx_compiler_flag(-faligned-new COMPILER_SUPPORTS_F_ALIGNED_NEW)
endif(NOT WIN32)
# Adds Profile Guided Optimization (PGO) flags to the current target
function(add_pgo TargetName)
if(CLR_CMAKE_PGO_INSTRUMENT)
if(CLR_CMAKE_HOST_WIN32)
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS_RELEASE " /LTCG /GENPROFILE")
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS_RELWITHDEBINFO " /LTCG /GENPROFILE")
else(CLR_CMAKE_HOST_WIN32)
if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
target_compile_options(${TargetName} PRIVATE -flto -fprofile-instr-generate)
set_property(TARGET ${TargetName} APPEND_STRING PROPERTY LINK_FLAGS " -flto -fuse-ld=gold -fprofile-instr-generate")
endif(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
endif(CLR_CMAKE_HOST_WIN32)
elseif(CLR_CMAKE_PGO_OPTIMIZE)
if(CLR_CMAKE_HOST_WIN32)
set(ProfileFileName "${TargetName}.pgd")
else(CLR_CMAKE_HOST_WIN32)
set(ProfileFileName "coreclr.profdata")
endif(CLR_CMAKE_HOST_WIN32)
file(TO_NATIVE_PATH
"${CLR_CMAKE_OPTDATA_PATH}/data/${ProfileFileName}"
ProfilePath
)
# If we don't have profile data availble, gracefully fall back to a non-PGO opt build
if(NOT EXISTS ${ProfilePath})
message("PGO data file NOT found: ${ProfilePath}")
elseif(CMAKE_GENERATOR MATCHES "Visual Studio")
# MSVC is sensitive to exactly the options passed during PGO optimization and Ninja and
# MSBuild differ slightly (but not meaningfully for runtime behavior)
message("Cannot use PGO optimization built with Ninja from MSBuild. Re-run build with Ninja to apply PGO information")
else(NOT EXISTS ${ProfilePath})
if(CLR_CMAKE_HOST_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(CLR_CMAKE_HOST_WIN32)
if(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
if((CMAKE_CXX_COMPILER_ID MATCHES "Clang") AND (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((CMAKE_CXX_COMPILER_ID MATCHES "Clang") AND (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((CMAKE_CXX_COMPILER_ID MATCHES "Clang") AND (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.6))
endif(UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELEASE OR UPPERCASE_CMAKE_BUILD_TYPE STREQUAL RELWITHDEBINFO)
endif(CLR_CMAKE_HOST_WIN32)
endif(NOT EXISTS ${ProfilePath})
endif(CLR_CMAKE_PGO_INSTRUMENT)
endfunction(add_pgo)
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