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include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
# We need some extra FAIL_REGEX patterns
# Note that CHECK_C_SOURCE_COMPILES is a misnomer, it will also link.
SET(fail_patterns
FAIL_REGEX "argument unused during compilation"
FAIL_REGEX "unsupported .*option"
FAIL_REGEX "unknown .*option"
FAIL_REGEX "unrecognized .*option"
FAIL_REGEX "ignoring unknown option"
FAIL_REGEX "warning:.*ignored"
FAIL_REGEX "[Ww]arning: [Oo]ption"
)
MACRO (MY_CHECK_C_COMPILER_FLAG flag result)
SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${result}
${fail_patterns})
SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
ENDMACRO()
MACRO (MY_CHECK_CXX_COMPILER_FLAG flag result)
SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
CHECK_CXX_SOURCE_COMPILES("int main(void) { return 0; }" ${result}
${fail_patterns})
SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
ENDMACRO()
FUNCTION(MY_CHECK_AND_SET_COMPILER_FLAG flag)
# At the moment this is gcc-only.
# Let's avoid expensive compiler tests on Windows:
IF(WIN32)
RETURN()
ENDIF()
MY_CHECK_C_COMPILER_FLAG(${flag} HAVE_C_${flag})
MY_CHECK_CXX_COMPILER_FLAG(${flag} HAVE_CXX_${flag})
IF (HAVE_C_${flag} AND HAVE_CXX_${flag})
IF(ARGN)
FOREACH(type ${ARGN})
SET(CMAKE_C_FLAGS_${type} "${CMAKE_C_FLAGS_${type}} ${flag}" PARENT_SCOPE)
SET(CMAKE_CXX_FLAGS_${type} "${CMAKE_CXX_FLAGS_${type}} ${flag}" PARENT_SCOPE)
ENDFOREACH()
ELSE()
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
ENDIF()
ENDIF()
ENDFUNCTION()
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