# - 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 #============================================================================= # Copyright 2002-2009 Kitware, Inc. # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) 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} ${CMAKE_REQUIRED_LIBRARIES}) endif() try_compile(${VARIABLE} ${CMAKE_BINARY_DIR} ${CMAKE_ROOT}/Modules/CheckFunctionExists.c COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION} -DLINK_DIRECTORIES:STRING=${LOCATION} OUTPUT_VARIABLE OUTPUT) if(${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() 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() endif() endmacro()