2017-12-22 14:48:31 -07:00
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include(CheckCCompilerFlag)
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macro(CHECK_LINKER_FLAG flag VARIABLE)
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if(NOT DEFINED "${VARIABLE}")
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for ${flag} linker flag")
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endif()
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set(_cle_source ${CMAKE_SOURCE_DIR}/cmake/CheckLinkerFlag.c)
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set(saved_CMAKE_C_FLAGS ${CMAKE_C_FLAGS})
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set(CMAKE_C_FLAGS "${flag}")
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try_compile(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${_cle_source}
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} ${flag}
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CMAKE_FLAGS
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OUTPUT_VARIABLE OUTPUT)
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unset(_cle_source)
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set(CMAKE_C_FLAGS ${saved_CMAKE_C_FLAGS})
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unset(saved_CMAKE_C_FLAGS)
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if ("${OUTPUT}" MATCHES "warning.*ignored")
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set(${VARIABLE} 0)
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endif()
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if(${VARIABLE})
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for ${flag} linker flag - found")
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endif()
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set(${VARIABLE} 1 CACHE INTERNAL "Have linker flag ${flag}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if the ${flag} linker flag is supported "
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"passed with the following output:\n"
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"${OUTPUT}\n\n")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for ${flag} linker flag - not found")
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endif()
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set(${VARIABLE} "" CACHE INTERNAL "Have linker flag ${flag}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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2018-09-23 10:31:30 -06:00
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"Determining if the ${flag} linker flag is supported "
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2017-12-22 14:48:31 -07:00
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"failed with the following output:\n"
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"${OUTPUT}\n\n")
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endif()
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endif()
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endmacro()
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