1 # - Check if the function exists.
2 # CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE)
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
9 # The following variables may be set before calling this macro to
10 # modify the way the check is run:
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
16 #=============================================================================
17 # Copyright 2002-2009 Kitware, Inc.
19 # Distributed under the OSI-approved BSD License (the "License");
20 # see accompanying file Copyright.txt for details.
22 # This software is distributed WITHOUT ANY WARRANTY; without even the
23 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
24 # See the License for more information.
25 #=============================================================================
26 # (To distribute this file outside of CMake, substitute the full
27 # License text for the above reference.)
31 macro(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
32 if("${VARIABLE}" MATCHES "^${VARIABLE}$")
33 set(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
34 "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
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} ${CMAKE_REQUIRED_LIBRARIES})
41 try_compile(${VARIABLE}
43 ${CMAKE_ROOT}/Modules/CheckFunctionExists.c
44 COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
45 LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES}
47 -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
48 -DLINK_DIRECTORIES:STRING=${LOCATION}
49 OUTPUT_VARIABLE OUTPUT)
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"
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"