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CMake options for LTO, fixes #4430

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Using LTO with older versions of binutils requires setting extra flags.
This commit is contained in:
Morgan Hardwood
2018-03-07 09:42:11 +01:00
parent bce1630c72
commit 3a404112af
1 changed files with 10 additions and 0 deletions
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10
CMakeLists.txt
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@@ -334,6 +334,16 @@ if(WITH_MYFILE_MMAP)
endif()
if(WITH_LTO)
# Using LTO with older versions of binutils requires setting extra flags
SET(BINUTILS_VERSION_MININUM "2.29")
execute_process(COMMAND ar --version OUTPUT_VARIABLE BINUTILS_VERSION_DETECTED)
string(REGEX REPLACE ".* ([0-9.]+)\n.*" "\\1" BINUTILS_VERSION_DETECTED "${BINUTILS_VERSION_DETECTED}")
if("${BINUTILS_VERSION_DETECTED}" VERSION_LESS "${BINUTILS_VERSION_MININUM}")
SET(CMAKE_AR "/usr/bin/gcc-ar")
SET(CMAKE_RANLIB "/usr/bin/gcc-ranlib")
message(STATUS "Binutils version detected as less than " ${BINUTILS_VERSION_MININUM} " - setting CMake parameters to enable LTO linking:\n CMAKE_AR=\"" ${CMAKE_AR} "\"\n CMAKE_RANLIB=\"" ${CMAKE_RANLIB} "\"")
endif()
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -flto")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -flto")
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -flto")