41 lines
1.8 KiB
CMake
41 lines
1.8 KiB
CMake
# - Check if the function exists.
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# CHECK_FUNCTION_EXISTS(FUNCTION VARIABLE)
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# - macro which checks if the function exists
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# FUNCTION - the name of the function
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# VARIABLE - variable to store the result
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# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
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# compile of the program likewise if CMAKE_REQUIRED_LIBRARIES is set then
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# those libraries will be linked against the test program
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#
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MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
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IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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SET(MACRO_CHECK_FUNCTION_DEFINITIONS
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"-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
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MESSAGE(STATUS "Looking for ${FUNCTION}")
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IF(CMAKE_REQUIRED_LIBRARIES)
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SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
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"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
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ENDIF(CMAKE_REQUIRED_LIBRARIES)
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TRY_COMPILE(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_ROOT}/Modules/CheckFunctionExists.c
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
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"${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}"
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OUTPUT_VARIABLE OUTPUT)
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IF(${VARIABLE})
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SET(${VARIABLE} 1 CACHE INTERNAL "Have function ${FUNCTION}")
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MESSAGE(STATUS "Looking for ${FUNCTION} - found")
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FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
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"Determining if the function ${FUNCTION} exists passed with the following output:\n"
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"${OUTPUT}\n\n")
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ELSE(${VARIABLE})
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MESSAGE(STATUS "Looking for ${FUNCTION} - not found")
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SET(${VARIABLE} "" CACHE INTERNAL "Have function ${FUNCTION}")
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FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
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"Determining if the function ${FUNCTION} exists failed with the following output:\n"
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"${OUTPUT}\n\n")
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ENDIF(${VARIABLE})
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ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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ENDMACRO(CHECK_FUNCTION_EXISTS)
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