41 lines
1.7 KiB
CMake
41 lines
1.7 KiB
CMake
#
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# Check if the function exists.
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#
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# CHECK_LIBRARY_EXISTS - 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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#
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MACRO(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
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IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
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"-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
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MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
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SET(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
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IF(CMAKE_REQUIRED_LIBRARIES)
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SET(CHECK_LIBRARY_EXISTS_LIBRARIES
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${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
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ENDIF(CMAKE_REQUIRED_LIBRARIES)
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TRY_COMPILE(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_ROOT}/Modules/CheckFunctionExists.c
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
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-DLINK_DIRECTORIES:STRING=${LOCATION}
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"-DLINK_LIBRARIES:STRING=${CHECK_LIBRARY_EXISTS_LIBRARIES}"
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OUTPUT_VARIABLE OUTPUT)
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IF(${VARIABLE})
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MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
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SET(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
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ELSE(${VARIABLE})
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MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
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SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
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"Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
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"failed with the following output:\n"
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"${OUTPUT}\n" APPEND)
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ENDIF(${VARIABLE})
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ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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ENDMACRO(CHECK_LIBRARY_EXISTS)
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