58 lines
2.5 KiB
CMake
58 lines
2.5 KiB
CMake
# - Check if the symbol exists in include files
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# CHECK_SYMBOL_EXISTS(SYMBOL FILES VARIABLE)
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#
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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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# 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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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 ${CMAKE_REQUIRED_FLAGS})
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IF(CMAKE_REQUIRED_LIBRARIES)
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SET(CHECK_SYMBOL_EXISTS_LIBS
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"-DLINK_LIBRARIES:STRING=${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}#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(int dummy,...){(void)dummy;}\nint main()\n{\n#ifndef ${SYMBOL}\n cmakeRequireSymbol(0,&${SYMBOL});\n#endif\n return 0;\n}\n")
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FILE(WRITE ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
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"${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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FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/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}\n")
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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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FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/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}\n")
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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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