cmake/CheckSharedLibraryExists.cmake

   1 # - Check if the function exists.
   2 # CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE)
   3 #
   4 #  LIBRARY  - the name of the library you are looking for
   5 #  FUNCTION - the name of the function
   6 #  LOCATION - location where the library should be found
   7 #  VARIABLE - variable to store the result
   8 #
   9 # The following variables may be set before calling this macro to
  10 # modify the way the check is run:
  11 #
  12 #  CMAKE_REQUIRED_FLAGS = string of compile command line flags
  13 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
  14 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
  15
  16 MACRO(CHECK_SHARED_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
  17   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  18     SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
  19       "-DCHECK_SHARED_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
  20     IF(WIN32)
  21         SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
  22             "-D_WIN32 ${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}")
  23     ENDIF(WIN32)
  24     MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
  25     SET(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
  26     IF(CMAKE_REQUIRED_LIBRARIES)
  27       SET(CHECK_LIBRARY_EXISTS_LIBRARIES
  28         ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
  29     ENDIF(CMAKE_REQUIRED_LIBRARIES)
  30     TRY_COMPILE(${VARIABLE}
  31       ${CMAKE_BINARY_DIR}
  32       ${CMAKE_SOURCE_DIR}/cmake/CheckSharedFunctionExists.c
  33       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
  34       CMAKE_FLAGS
  35       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
  36       -DLINK_DIRECTORIES:STRING=${LOCATION}
  37       "-DLINK_LIBRARIES:STRING=${CHECK_LIBRARY_EXISTS_LIBRARIES}"
  38       OUTPUT_VARIABLE OUTPUT)
  39
  40     IF(${VARIABLE})
  41       MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
  42       SET(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
  43       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  44         "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
  45         "passed with the following output:\n"
  46         "${OUTPUT}\n\n")
  47     ELSE(${VARIABLE})
  48       MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
  49       SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
  50       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  51         "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
  52         "failed with the following output:\n"
  53         "${OUTPUT}\n\n")
  54     ENDIF(${VARIABLE})
  55   ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  56 ENDMACRO(CHECK_SHARED_LIBRARY_EXISTS)