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90 lines
3.1 KiB
90 lines
3.1 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# CheckIncludeFile
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# ----------------
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#
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# Provides a macro to check if a header file can be included in ``C``.
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#
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# .. command:: CHECK_INCLUDE_FILE
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#
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# ::
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#
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# CHECK_INCLUDE_FILE(<include> <variable> [<flags>])
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#
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# Check if the given ``<include>`` file may be included in a ``C``
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# source file and store the result in an internal cache entry named
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# ``<variable>``. The optional third argument may be used to add
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# compilation flags to the check (or use ``CMAKE_REQUIRED_FLAGS`` below).
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#
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# The following variables may be set before calling this macro to modify
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# the way the check is run:
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#
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# ``CMAKE_REQUIRED_FLAGS``
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# string of compile command line flags
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# ``CMAKE_REQUIRED_DEFINITIONS``
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# list of macros to define (-DFOO=bar)
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# ``CMAKE_REQUIRED_INCLUDES``
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# list of include directories
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# ``CMAKE_REQUIRED_QUIET``
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# execute quietly without messages
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#
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# See the :module:`CheckIncludeFiles` module to check for multiple headers
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# at once. See the :module:`CheckIncludeFileCXX` module to check for headers
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# using the ``CXX`` language.
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macro(CHECK_INCLUDE_FILE INCLUDE VARIABLE)
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if(NOT DEFINED "${VARIABLE}")
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if(CMAKE_REQUIRED_INCLUDES)
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set(CHECK_INCLUDE_FILE_C_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
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else()
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set(CHECK_INCLUDE_FILE_C_INCLUDE_DIRS)
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endif()
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set(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
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set(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
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configure_file(${CMAKE_ROOT}/Modules/CheckIncludeFile.c.in
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.c)
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for ${INCLUDE}")
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endif()
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if(${ARGC} EQUAL 3)
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set(CMAKE_C_FLAGS_SAVE ${CMAKE_C_FLAGS})
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string(APPEND CMAKE_C_FLAGS " ${ARGV2}")
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endif()
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try_compile(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.c
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
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"${CHECK_INCLUDE_FILE_C_INCLUDE_DIRS}"
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OUTPUT_VARIABLE OUTPUT)
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if(${ARGC} EQUAL 3)
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set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS_SAVE})
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endif()
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if(${VARIABLE})
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for ${INCLUDE} - found")
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endif()
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set(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if the include file ${INCLUDE} "
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"exists passed with the following output:\n"
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"${OUTPUT}\n\n")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Looking for ${INCLUDE} - not found")
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endif()
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set(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if the include file ${INCLUDE} "
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"exists failed with the following output:\n"
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"${OUTPUT}\n\n")
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endif()
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endif()
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endmacro()
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