| # - Check if the function exists. |
| # CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE) |
| # |
| # LIBRARY - the name of the library you are looking for |
| # FUNCTION - the name of the function |
| # LOCATION - location where the library should be found |
| # VARIABLE - variable to store the 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_LIBRARIES = list of libraries to link |
| |
| MACRO(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE) |
| IF("${VARIABLE}" MATCHES "^${VARIABLE}$") |
| SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION |
| "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}") |
| MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY}") |
| SET(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY}) |
| IF(CMAKE_REQUIRED_LIBRARIES) |
| SET(CHECK_LIBRARY_EXISTS_LIBRARIES |
| ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES}) |
| ENDIF(CMAKE_REQUIRED_LIBRARIES) |
| TRY_COMPILE(${VARIABLE} |
| ${CMAKE_BINARY_DIR} |
| ${CMAKE_ROOT}/Modules/CheckFunctionExists.c |
| COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} |
| CMAKE_FLAGS |
| -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION} |
| -DLINK_DIRECTORIES:STRING=${LOCATION} |
| "-DLINK_LIBRARIES:STRING=${CHECK_LIBRARY_EXISTS_LIBRARIES}" |
| OUTPUT_VARIABLE OUTPUT) |
| |
| IF(${VARIABLE}) |
| MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found") |
| SET(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}") |
| FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log |
| "Determining if the function ${FUNCTION} exists in the ${LIBRARY} " |
| "passed with the following output:\n" |
| "${OUTPUT}\n\n") |
| ELSE(${VARIABLE}) |
| MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found") |
| SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}") |
| FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log |
| "Determining if the function ${FUNCTION} exists in the ${LIBRARY} " |
| "failed with the following output:\n" |
| "${OUTPUT}\n\n") |
| ENDIF(${VARIABLE}) |
| ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$") |
| ENDMACRO(CHECK_LIBRARY_EXISTS) |