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cmake: add a USE_LTO option 

Note: nothing work so don't use it.
This commit is contained in:
Gregory Hainaut 2015-11-15 13:54:47 +01:00
parent 1437640bc5
commit a46204ef9e
1 changed files with 15 additions and 1 deletions
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16
cmake/BuildParameters.cmake
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@ -231,6 +231,8 @@ endif()
#-------------------------------------------------------------------------------
# Set some default compiler flags
#-------------------------------------------------------------------------------
option(USE_LTO "Enable LTO optimization (will likely break the build)")
set(COMMON_FLAG "-pipe -fvisibility=hidden -pthread -fno-builtin-strcmp -fno-builtin-memcmp")
if (DISABLE_SVU)
set(COMMON_FLAG "${COMMON_FLAG} -DDISABLE_SVU")
@ -254,6 +256,18 @@ else()
set(DBG "-ggdb")
endif()
if (USE_LTO)
#gcc --print-file-name=liblto_plugin.so
#set(LTO_FLAGS "-fuse-linker-plugin -flto=4 --plugin=/usr/lib/gcc/x86_64-linux-gnu/4.9/liblto_plugin.so")
#set(LTO_FLAGS "-fuse-linker-plugin -fuse-ld=gold -flto=4 --plugin=/usr/lib/gcc/x86_64-linux-gnu/4.9/liblto_plugin.so")
set(LTO_FLAGS "-fuse-linker-plugin -fuse-ld=gold -flto=4")
#set(LINK_FLAGS "--plugin=/usr/lib/gcc/x86_64-linux-gnu/4.9/liblto_plugin.so")
set(USER_CMAKE_LD_FLAGS "--plugin /usr/lib/gcc/x86_64-linux-gnu/4.9/liblto_plugin.so")
set(DBG "") # not supported with LTO
else()
set(LTO_FLAGS "")
endif()
if(CMAKE_BUILD_TYPE MATCHES "Debug")
set(DEBUG_FLAG "${DBG}")
elseif(CMAKE_BUILD_TYPE MATCHES "Devel")
@ -284,7 +298,7 @@ else()
endif()
# Note: -DGTK_DISABLE_DEPRECATED can be used to test a build without gtk deprecated feature. It could be useful to port to a newer API
set(DEFAULT_GCC_FLAG "${ARCH_FLAG} ${COMMON_FLAG} ${DEFAULT_WARNINGS} ${AGGRESSIVE_WARNING} ${HARDENING_FLAG} ${DEBUG_FLAG} ${ASAN_FLAG} ${OPTIMIZATION_FLAG}")
set(DEFAULT_GCC_FLAG "${ARCH_FLAG} ${COMMON_FLAG} ${DEFAULT_WARNINGS} ${AGGRESSIVE_WARNING} ${HARDENING_FLAG} ${DEBUG_FLAG} ${ASAN_FLAG} ${OPTIMIZATION_FLAG} ${LTO_FLAGS}")
# c++ only flags
set(DEFAULT_CPP_FLAG "${DEFAULT_GCC_FLAG} -std=c++11 -Wno-invalid-offsetof")