| # - Check if the symbol exists in include files |
| # CHECK_SYMBOL_EXISTS(SYMBOL FILES VARIABLE) |
| # |
| # SYMBOL - symbol |
| # FILES - include files to check |
| # VARIABLE - variable to return result |
| # |
| # The following variables may be set before calling this macro to |
| # modify the way the check is run: |
| # |
| # CMAKE_REQUIRED_FLAGS = string of compile command line flags |
| # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) |
| # CMAKE_REQUIRED_INCLUDES = list of include directories |
| # CMAKE_REQUIRED_LIBRARIES = list of libraries to link |
| |
| MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE) |
| IF("${VARIABLE}" MATCHES "^${VARIABLE}$") |
| SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n") |
| SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS}) |
| IF(CMAKE_REQUIRED_LIBRARIES) |
| SET(CHECK_SYMBOL_EXISTS_LIBS |
| "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}") |
| ELSE(CMAKE_REQUIRED_LIBRARIES) |
| SET(CHECK_SYMBOL_EXISTS_LIBS) |
| ENDIF(CMAKE_REQUIRED_LIBRARIES) |
| IF(CMAKE_REQUIRED_INCLUDES) |
| SET(CMAKE_SYMBOL_EXISTS_INCLUDES |
| "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") |
| ELSE(CMAKE_REQUIRED_INCLUDES) |
| SET(CMAKE_SYMBOL_EXISTS_INCLUDES) |
| ENDIF(CMAKE_REQUIRED_INCLUDES) |
| FOREACH(FILE ${FILES}) |
| SET(CMAKE_CONFIGURABLE_FILE_CONTENT |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n") |
| ENDFOREACH(FILE) |
| SET(CMAKE_CONFIGURABLE_FILE_CONTENT |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nvoid cmakeRequireSymbol(int dummy,...){(void)dummy;}\nint main()\n{\n#ifndef ${SYMBOL}\n cmakeRequireSymbol(0,&${SYMBOL});\n#endif\n return 0;\n}\n") |
| |
| CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in" |
| "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" @ONLY) |
| |
| MESSAGE(STATUS "Looking for ${SYMBOL}") |
| TRY_COMPILE(${VARIABLE} |
| ${CMAKE_BINARY_DIR} |
| ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c |
| COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} |
| CMAKE_FLAGS |
| -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS} |
| "${CHECK_SYMBOL_EXISTS_LIBS}" |
| "${CMAKE_SYMBOL_EXISTS_INCLUDES}" |
| OUTPUT_VARIABLE OUTPUT) |
| IF(${VARIABLE}) |
| MESSAGE(STATUS "Looking for ${SYMBOL} - found") |
| SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}") |
| FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log |
| "Determining if the ${SYMBOL} " |
| "exist passed with the following output:\n" |
| "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n" |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") |
| ELSE(${VARIABLE}) |
| MESSAGE(STATUS "Looking for ${SYMBOL} - not found.") |
| SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}") |
| FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log |
| "Determining if the ${SYMBOL} " |
| "exist failed with the following output:\n" |
| "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n" |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") |
| ENDIF(${VARIABLE}) |
| ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$") |
| ENDMACRO(CHECK_SYMBOL_EXISTS) |
