2003-01-13 06:28:32 +03:00
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#
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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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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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2003-02-17 18:30:13 +03:00
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"${CHECK_SYMBOL_EXISTS_CONTENT}\n\nint main${PARENTS}{"
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2003-01-13 06:28:32 +03:00
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"\n${POUND}ifndef ${SYMBOL}\nchar ${OPEN_PARENT}*f${CLOSE_PARENT} ${PARENTS} = ${SYMBOL};\n${POUND}endif\nreturn 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} in ${FILES}")
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TRY_COMPILE(${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=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
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OUTPUT_VARIABLE OUTPUT)
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IF(${VARIABLE})
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MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES} - found")
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SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")
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ELSE(${VARIABLE})
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MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES} - not found.")
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SET(${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}\n" 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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