1 # - Check if the files can be included
3 # CHECK_INCLUDE_FILES(INCLUDE VARIABLE)
5 # INCLUDE - list of files to include
6 # VARIABLE - variable to return result
8 # The following variables may be set before calling this macro to
9 # modify the way the check is run:
11 # CMAKE_REQUIRED_FLAGS = string of compile command line flags
12 # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
13 # CMAKE_REQUIRED_INCLUDES = list of include directories
15 #=============================================================================
16 # Copyright 2003-2012 Kitware, Inc.
18 # Distributed under the OSI-approved BSD License (the "License");
19 # see accompanying file Copyright.txt for details.
21 # This software is distributed WITHOUT ANY WARRANTY; without even the
22 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 # See the License for more information.
24 #=============================================================================
25 # (To distribute this file outside of CMake, substitute the full
26 # License text for the above reference.)
28 macro(CHECK_INCLUDE_FILES INCLUDE VARIABLE)
29 if("${VARIABLE}" MATCHES "^${VARIABLE}$")
30 set(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")
31 if(CMAKE_REQUIRED_INCLUDES)
32 set(CHECK_INCLUDE_FILES_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
34 set(CHECK_INCLUDE_FILES_INCLUDE_DIRS)
36 set(CHECK_INCLUDE_FILES_CONTENT "/* */\n")
37 set(MACRO_CHECK_INCLUDE_FILES_FLAGS ${CMAKE_REQUIRED_FLAGS})
38 foreach(FILE ${INCLUDE})
39 set(CMAKE_CONFIGURABLE_FILE_CONTENT
40 "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")
42 set(CMAKE_CONFIGURABLE_FILE_CONTENT
43 "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n\nint main(){return 0;}\n")
44 configure_file("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
45 "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFiles.c" @ONLY IMMEDIATE)
47 set(_INCLUDE ${INCLUDE}) # remove empty elements
48 if("${_INCLUDE}" MATCHES "^([^;]+);.+;([^;]+)$")
49 list(LENGTH _INCLUDE _INCLUDE_LEN)
50 set(_description "${_INCLUDE_LEN} include files ${CMAKE_MATCH_1}, ..., ${CMAKE_MATCH_2}")
51 elseif("${_INCLUDE}" MATCHES "^([^;]+);([^;]+)$")
52 set(_description "include files ${CMAKE_MATCH_1}, ${CMAKE_MATCH_2}")
54 set(_description "include file ${_INCLUDE}")
57 message(STATUS "Looking for ${_description}")
58 try_compile(${VARIABLE}
60 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFiles.c
61 COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
63 -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILES_FLAGS}
64 "${CHECK_INCLUDE_FILES_INCLUDE_DIRS}"
65 OUTPUT_VARIABLE OUTPUT)
67 message(STATUS "Looking for ${_description} - found")
68 set(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
69 file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
70 "Determining if files ${INCLUDE} "
71 "exist passed with the following output:\n"
74 message(STATUS "Looking for ${_description} - not found")
75 set(${VARIABLE} "" CACHE INTERNAL "Have includes ${INCLUDE}")
76 file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
77 "Determining if files ${INCLUDE} "
78 "exist failed with the following output:\n"
79 "${OUTPUT}\nSource:\n${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")