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 #  ARGCOUNT - number of arguments for stdcall functions
   7 #  LOCATION - location where the library should be found
   8 #  VARIABLE - variable to store the result
   9 #
  10 # The following variables may be set before calling this macro to
  11 # modify the way the check is run:
  12 #
  13 #  CMAKE_REQUIRED_FLAGS = string of compile command line flags
  14 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
  15 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
  16
  17 MACRO(CHECK_SHARED_LIBRARY_EXISTS LIBRARY FUNCTION ARGCOUNT LOCATION VARIABLE)
  18   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  19     SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
  20       "-DCHECK_SHARED_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
  21     IF(WIN32)
  22         IF(${ARGCOUNT} GREATER 0)
  23             SET(ARGSTACK "void*")
  24             SET(CALLSTACK "NULL")
  25             SET(CURARG 1)
  26             WHILE(${ARGCOUNT} GREATER ${CURARG})
  27                 SET(ARGSTACK "${ARGSTACK},void*")
  28                 SET(CALLSTACK "${CALLSTACK},NULL")
  29                 MATH(EXPR CURARG "${CURARG} + 1")
  30             ENDWHILE(${ARGCOUNT} GREATER ${CURARG})
  31         ENDIF(${ARGCOUNT} GREATER 0)
  32         SET(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
  33             "-D_WIN32 -DARGSTACK=\"${ARGSTACK}\" -DCALLSTACK=\"${CALLSTACK}\" ${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}")
  34     ENDIF(WIN32)
  35     MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
  36     SET(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
  37     IF(CMAKE_REQUIRED_LIBRARIES)
  38       SET(CHECK_LIBRARY_EXISTS_LIBRARIES
  39         ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
  40     ENDIF(CMAKE_REQUIRED_LIBRARIES)
  41     TRY_COMPILE(${VARIABLE}
  42       ${CMAKE_BINARY_DIR}
  43       ${CMAKE_SOURCE_DIR}/cmake/CheckSharedFunctionExists.c
  44       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
  45       CMAKE_FLAGS
  46       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
  47       -DLINK_DIRECTORIES:STRING=${LOCATION}
  48       "-DLINK_LIBRARIES:STRING=${CHECK_LIBRARY_EXISTS_LIBRARIES}"
  49       OUTPUT_VARIABLE OUTPUT)
  50
  51     IF(${VARIABLE})
  52       MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
  53       SET(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
  54       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  55         "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
  56         "passed with the following output:\n"
  57         "${OUTPUT}\n\n")
  58     ELSE(${VARIABLE})
  59       MESSAGE(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
  60       SET(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
  61       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  62         "Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
  63         "failed with the following output:\n"
  64         "${OUTPUT}\n\n")
  65     ENDIF(${VARIABLE})
  66   ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  67 ENDMACRO(CHECK_SHARED_LIBRARY_EXISTS)