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User setting to turn LTO on and off 

This isn't currently working on mingw
This commit is contained in:
Zachary Michaels 2014-08-06 12:52:25 -04:00 committed by Riccardo Spagni
parent e1dfd58bdb
commit 729d4bb91d
1 changed files with 13 additions and 9 deletions
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22
CMakeLists.txt
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@ -92,11 +92,6 @@ else()
else()
set(WARNINGS "${WARNINGS} -Wlogical-op -Wno-error=maybe-uninitialized")
endif()
# Since gcc 4.9 the LTO format is non-standard (slim), so we need the gcc-specific ar and ranlib binaries
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9.0))
set(CMAKE_AR "gcc-ar")
set(CMAKE_RANLIB "gcc-ranlib")
endif()
if(MINGW)
set(WARNINGS "${WARNINGS} -Wno-error=unused-value -Wno-error=unused-but-set-variable")
set(MINGW_FLAG "${MINGW_FLAG} -DWIN32_LEAN_AND_MEAN")
@ -121,14 +116,23 @@ else()
else()
set(DEBUG_FLAGS "-g3 -O0")
endif()
set(RELEASE_FLAGS "-Ofast -DNDEBUG -Wno-unused-variable")
if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
set(USE_LTO false CACHE BOOL "Use Link-Time Optimization (Release mode only)")
if(USE_LTO)
# There is a clang bug that does not allow to compile code that uses AES-NI intrinsics if -flto is enabled
set(RELEASE_FLAGS "${RELEASE_FLAGS} -flto")
if(STATIC)
set(RELEASE_FLAGS "${RELEASE_FLAGS} -ffat-lto-objects")
endif()
# Since gcc 4.9 the LTO format is non-standard (slim), so we need the gcc-specific ar and ranlib binaries
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9.0))
set(CMAKE_AR "gcc-ar")
set(CMAKE_RANLIB "gcc-ranlib")
endif()
endif()
#if(CMAKE_C_COMPILER_ID STREQUAL "GNU" AND NOT MINGW)
# set(RELEASE_FLAGS "${RELEASE_FLAGS} -fno-fat-lto-objects")
#endif()
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${DEBUG_FLAGS}")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${DEBUG_FLAGS}")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${RELEASE_FLAGS}")