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119 lines
4.0 KiB
CMake
119 lines
4.0 KiB
CMake
# 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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Provides a macro to check if a header file can be included in ``C``.
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.. command:: CHECK_INCLUDE_FILE
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.. code-block:: cmake
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CHECK_INCLUDE_FILE(<include> <variable> [<flags>])
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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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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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.. include:: /module/CMAKE_REQUIRED_FLAGS.txt
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.. include:: /module/CMAKE_REQUIRED_DEFINITIONS.txt
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.. include:: /module/CMAKE_REQUIRED_INCLUDES.txt
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.. include:: /module/CMAKE_REQUIRED_LINK_OPTIONS.txt
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.. include:: /module/CMAKE_REQUIRED_LIBRARIES.txt
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.. include:: /module/CMAKE_REQUIRED_QUIET.txt
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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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#]=======================================================================]
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include_guard(GLOBAL)
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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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file(READ ${CMAKE_ROOT}/Modules/CheckIncludeFile.c.in _CIF_SOURCE_CONTENT)
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string(CONFIGURE "${_CIF_SOURCE_CONTENT}" _CIF_SOURCE_CONTENT)
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_START "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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set(_CIF_LINK_OPTIONS)
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if(CMAKE_REQUIRED_LINK_OPTIONS)
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set(_CIF_LINK_OPTIONS LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
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endif()
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set(_CIF_LINK_LIBRARIES "")
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if(CMAKE_REQUIRED_LIBRARIES)
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cmake_policy(GET CMP0075 _CIF_CMP0075
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PARENT_SCOPE # undocumented, do not use outside of CMake
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)
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if("x${_CIF_CMP0075}x" STREQUAL "xNEWx")
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set(_CIF_LINK_LIBRARIES LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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elseif("x${_CIF_CMP0075}x" STREQUAL "xOLDx")
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elseif(NOT _CIF_CMP0075_WARNED)
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set(_CIF_CMP0075_WARNED 1)
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message(AUTHOR_WARNING
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"Policy CMP0075 is not set: Include file check macros honor CMAKE_REQUIRED_LIBRARIES. "
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"Run \"cmake --help-policy CMP0075\" for policy details. "
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"Use the cmake_policy command to set the policy and suppress this warning."
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"\n"
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"CMAKE_REQUIRED_LIBRARIES is set to:\n"
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" ${CMAKE_REQUIRED_LIBRARIES}\n"
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"For compatibility with CMake 3.11 and below this check is ignoring it."
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)
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endif()
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unset(_CIF_CMP0075)
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endif()
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try_compile(${VARIABLE}
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SOURCE_FROM_VAR CheckIncludeFile.c _CIF_SOURCE_CONTENT
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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${_CIF_LINK_OPTIONS}
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${_CIF_LINK_LIBRARIES}
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
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"${CHECK_INCLUDE_FILE_C_INCLUDE_DIRS}"
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)
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unset(_CIF_LINK_OPTIONS)
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unset(_CIF_LINK_LIBRARIES)
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if(${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(CHECK_PASS "found")
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endif()
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set(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_FAIL "not found")
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endif()
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set(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}")
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endif()
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endif()
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endmacro()
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