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# define system dependent compiler flags
include(CheckCXXCompilerFlag)
# with -fPIC
if(UNIX AND NOT WIN32)
if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
check_cxx_compiler_flag("-fPIC" WITH_FPIC)
if(WITH_FPIC)
ADD_DEFINITIONS(-fPIC)
endif(WITH_FPIC)
endif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
endif(UNIX AND NOT WIN32)
# function to test for compile flags
function(cxx_add_flag_if_supported flag)
check_cxx_compiler_flag(${flag} Flag:${flag})
if(Flag:${flag})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
endif(Flag:${flag})
endfunction(cxx_add_flag_if_supported)
function(cxx_local_system_optimization)
set(flag "-march=native")
check_cxx_compiler_flag(${flag} Flag:${flag})
if(Flag:${flag})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}")
message(STATUS [=[
BUILDING FOR LOCAL SYSTEM ONLY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Specifying -DBUILD_FOR_LOCAL_SYSTEM=ON will pass -march=native to the compiler.
The generated binary will exhibit higher performance,
but will not be portable (e.g., might not work on other CPUs)]=])
else(Flag:${flag})
message(STATUS [=[
Your compiler does not support -march=native.
Ignoring -DBUILD_FOR_LOCAL_SYSTEM=ON!]=])
endif(Flag:${flag})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
endfunction(cxx_local_system_optimization)
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