Modules/CheckLibraryExists.cmake

   1 #
   2 # Check if the function exists.
   3 #
   4 # CHECK_LIBRARY_EXISTS - macro which checks if the function exists
   5 # FUNCTION - the name of the function
   6 # VARIABLE - variable to store the result
   7 #
   8
   9 MACRO(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
  10   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  11     SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
  12       "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
  13     MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
  14     SET(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
  15     IF(CMAKE_REQUIRED_LIBRARIES)
  16       SET(CHECK_LIBRARY_EXISTS_LIBRARIES
  17         ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
  18     ENDIF(CMAKE_REQUIRED_LIBRARIES)
  19     TRY_COMPILE(${VARIABLE}
  20       ${CMAKE_BINARY_DIR}
  21       ${CMAKE_ROOT}/Modules/CheckFunctionExists.c
  22       CMAKE_FLAGS
  23       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
  24       -DLINK_DIRECTORIES:STRING=${LOCATION}
  25       "-DLINK_LIBRARIES:STRING=${CHECK_LIBRARY_EXISTS_LIBRARIES}"
  26       OUTPUT_VARIABLE OUTPUT)
  27
  28     IF(${VARIABLE})
  29       MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
  30       SET(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
  31       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log
  32         "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
  33         "passed with the following output:\n"
  34         "${OUTPUT}\n\n")
  35     ELSE(${VARIABLE})
  36       MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
  37       SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
  38       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeError.log
  39         "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
  40         "failed with the following output:\n"
  41         "${OUTPUT}\n\n")
  42     ENDIF(${VARIABLE})
  43   ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  44 ENDMACRO(CHECK_LIBRARY_EXISTS)