function(check_lto)
|
if (DEFINED LTO_WORKS)
|
return()
|
endif()
|
|
set(LTO_WORKS FALSE CACHE INTERNAL "LTO works")
|
|
CHECK_CXX_COMPILER_FLAG("-flto" HAS_LTO_FLAG)
|
|
if (NOT HAS_LTO_FLAG)
|
return()
|
endif()
|
|
find_program(LTO_AR NAMES "${CMAKE_C_COMPILER}-ar" gcc-ar)
|
find_program(LTO_RANLIB NAMES "${CMAKE_C_COMPILER}-ranlib" gcc-ranlib)
|
|
if (NOT LTO_AR OR NOT LTO_RANLIB)
|
return()
|
endif()
|
|
EXECUTE_PROCESS(COMMAND "${LTO_AR}" --version RESULT_VARIABLE ret OUTPUT_QUIET ERROR_QUIET)
|
if (ret)
|
return()
|
endif()
|
|
EXECUTE_PROCESS(COMMAND "${LTO_RANLIB}" --version RESULT_VARIABLE ret OUTPUT_QUIET ERROR_QUIET)
|
if (ret)
|
return()
|
endif()
|
|
set(LTO_WORKS TRUE CACHE INTERNAL "LTO works")
|
endfunction()
|
