59 lines
2.6 KiB
CMake
59 lines
2.6 KiB
CMake
#
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# Check if the symbol exists in include files
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#
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# CHECK_SYMBOL_EXISTS - macro which checks the symbol exists in include files.
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# SYMBOL - symbol
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# FILES - include files to check
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# VARIABLE - variable to return result
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#
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MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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SET(CHECK_SYMBOL_EXISTS_CONTENT "/* */\n")
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SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
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STRING(ASCII 35 POUND)
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STRING(ASCII 40 OPEN_PARENT)
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STRING(ASCII 41 CLOSE_PARENT)
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SET(PARENTS "${OPEN_PARENT}${CLOSE_PARENT}")
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IF(CMAKE_REQUIRED_LIBRARIES)
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SET(CHECK_SYMBOL_EXISTS_LIBS
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"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
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ENDIF(CMAKE_REQUIRED_LIBRARIES)
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FOREACH(FILE ${FILES})
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SET(CHECK_SYMBOL_EXISTS_CONTENT
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"${CHECK_SYMBOL_EXISTS_CONTENT}${POUND}include <${FILE}>\n")
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ENDFOREACH(FILE)
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SET(CHECK_SYMBOL_EXISTS_CONTENT
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"${CHECK_SYMBOL_EXISTS_CONTENT}\nvoid cmakeRequireSymbol${OPEN_PARENT}int dummy,...${CLOSE_PARENT}{${OPEN_PARENT}void${CLOSE_PARENT}dummy;}\nint main${PARENTS}\n{\n${POUND}ifndef ${SYMBOL}\n cmakeRequireSymbol${OPEN_PARENT}0,&${SYMBOL}${CLOSE_PARENT};\n${POUND}endif\n return 0;\n}\n")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
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"${CHECK_SYMBOL_EXISTS_CONTENT}")
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MESSAGE(STATUS "Looking for ${SYMBOL}")
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TRY_COMPILE(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
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"${CHECK_SYMBOL_EXISTS_LIBS}"
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OUTPUT_VARIABLE OUTPUT)
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IF(${VARIABLE})
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MESSAGE(STATUS "Looking for ${SYMBOL} - found")
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SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeOutput.log
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"Determining if the ${SYMBOL} "
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"exist passed with the following output:\n"
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"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c:\n"
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"${CHECK_SYMBOL_EXISTS_CONTENT}" APPEND)
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ELSE(${VARIABLE})
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MESSAGE(STATUS "Looking for ${SYMBOL} - not found.")
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SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}")
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WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
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"Determining if the ${SYMBOL} "
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"exist failed with the following output:\n"
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"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c:\n"
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"${CHECK_SYMBOL_EXISTS_CONTENT}" APPEND)
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ENDIF(${VARIABLE})
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ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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ENDMACRO(CHECK_SYMBOL_EXISTS)
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