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LTO fix for gcc 4.9 #1013

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May 12, 2014
Merged

LTO fix for gcc 4.9 #1013

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10 changes: 9 additions & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -107,8 +107,16 @@ endif()
# Check if LTO is available
set(LTO_FLAGS "")
CHECK_CXX_COMPILER_FLAG("-flto" HAS_LTO_FLAG)
if (HAS_LTO_FLAG)
if (HAS_LTO_FLAG)
set(LTO_FLAGS "${LTO_FLAGS} -flto")

# Since gcc 4.9 the LTO format is non-standart ('slim'), so we need to use the build-in tools
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND
NOT "${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "4.9.0")
message(STATUS "Using gcc specific binutils for LTO.")
set(CMAKE_AR "/usr/bin/gcc-ar")
set(CMAKE_RANLIB "/usr/bin/gcc-ranlib")
endif()
endif (HAS_LTO_FLAG)

# disable partitioning of LTO process when possible (fixes Debian issues)
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