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Diffstat (limited to 'share/cmake-3.18/Modules/CheckIncludeFileCXX.cmake')
| -rw-r--r-- | share/cmake-3.18/Modules/CheckIncludeFileCXX.cmake | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/share/cmake-3.18/Modules/CheckIncludeFileCXX.cmake b/share/cmake-3.18/Modules/CheckIncludeFileCXX.cmake new file mode 100644 index 0000000..496550f --- /dev/null +++ b/share/cmake-3.18/Modules/CheckIncludeFileCXX.cmake @@ -0,0 +1,129 @@ +# Distributed under the OSI-approved BSD 3-Clause License. See accompanying +# file Copyright.txt or https://cmake.org/licensing for details. + +#[=======================================================================[.rst: +CheckIncludeFileCXX +------------------- + +Provides a macro to check if a header file can be included in ``CXX``. + +.. command:: CHECK_INCLUDE_FILE_CXX + + .. code-block:: cmake + + CHECK_INCLUDE_FILE_CXX(<include> <variable> [<flags>]) + + Check if the given ``<include>`` file may be included in a ``CXX`` + source file and store the result in an internal cache entry named + ``<variable>``. The optional third argument may be used to add + compilation flags to the check (or use ``CMAKE_REQUIRED_FLAGS`` below). + +The following variables may be set before calling this macro to modify +the way the check is run: + +``CMAKE_REQUIRED_FLAGS`` + string of compile command line flags. +``CMAKE_REQUIRED_DEFINITIONS`` + a :ref:`;-list <CMake Language Lists>` of macros to define (-DFOO=bar). +``CMAKE_REQUIRED_INCLUDES`` + a :ref:`;-list <CMake Language Lists>` of header search paths to pass to + the compiler. +``CMAKE_REQUIRED_LINK_OPTIONS`` + a :ref:`;-list <CMake Language Lists>` of options to add to the link command. +``CMAKE_REQUIRED_LIBRARIES`` + a :ref:`;-list <CMake Language Lists>` of libraries to add to the link + command. See policy :policy:`CMP0075`. +``CMAKE_REQUIRED_QUIET`` + execute quietly without messages. + +See modules :module:`CheckIncludeFile` and :module:`CheckIncludeFiles` +to check for one or more ``C`` headers. +#]=======================================================================] + +include_guard(GLOBAL) + +macro(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE) + if(NOT DEFINED "${VARIABLE}" OR "x${${VARIABLE}}" STREQUAL "x${VARIABLE}") + if(CMAKE_REQUIRED_INCLUDES) + set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}") + else() + set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS) + endif() + set(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS}) + set(CHECK_INCLUDE_FILE_VAR ${INCLUDE}) + configure_file(${CMAKE_ROOT}/Modules/CheckIncludeFile.cxx.in + ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.cxx) + if(NOT CMAKE_REQUIRED_QUIET) + message(CHECK_START "Looking for C++ include ${INCLUDE}") + endif() + if(${ARGC} EQUAL 3) + set(CMAKE_CXX_FLAGS_SAVE ${CMAKE_CXX_FLAGS}) + string(APPEND CMAKE_CXX_FLAGS " ${ARGV2}") + endif() + + set(_CIF_LINK_OPTIONS) + if(CMAKE_REQUIRED_LINK_OPTIONS) + set(_CIF_LINK_OPTIONS LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS}) + endif() + + set(_CIF_LINK_LIBRARIES "") + if(CMAKE_REQUIRED_LIBRARIES) + cmake_policy(GET CMP0075 _CIF_CMP0075 + PARENT_SCOPE # undocumented, do not use outside of CMake + ) + if("x${_CIF_CMP0075}x" STREQUAL "xNEWx") + set(_CIF_LINK_LIBRARIES LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) + elseif("x${_CIF_CMP0075}x" STREQUAL "xOLDx") + elseif(NOT _CIF_CMP0075_WARNED) + set(_CIF_CMP0075_WARNED 1) + message(AUTHOR_WARNING + "Policy CMP0075 is not set: Include file check macros honor CMAKE_REQUIRED_LIBRARIES. " + "Run \"cmake --help-policy CMP0075\" for policy details. " + "Use the cmake_policy command to set the policy and suppress this warning." + "\n" + "CMAKE_REQUIRED_LIBRARIES is set to:\n" + " ${CMAKE_REQUIRED_LIBRARIES}\n" + "For compatibility with CMake 3.11 and below this check is ignoring it." + ) + endif() + unset(_CIF_CMP0075) + endif() + + try_compile(${VARIABLE} + ${CMAKE_BINARY_DIR} + ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.cxx + COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} + ${_CIF_LINK_OPTIONS} + ${_CIF_LINK_LIBRARIES} + CMAKE_FLAGS + -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS} + "${CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS}" + OUTPUT_VARIABLE OUTPUT) + unset(_CIF_LINK_OPTIONS) + unset(_CIF_LINK_LIBRARIES) + + if(${ARGC} EQUAL 3) + set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS_SAVE}) + endif() + + if(${VARIABLE}) + if(NOT CMAKE_REQUIRED_QUIET) + message(CHECK_PASS "found") + endif() + set(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}") + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log + "Determining if the include file ${INCLUDE} " + "exists passed with the following output:\n" + "${OUTPUT}\n\n") + else() + if(NOT CMAKE_REQUIRED_QUIET) + message(CHECK_FAIL "not found") + endif() + set(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}") + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log + "Determining if the include file ${INCLUDE} " + "exists failed with the following output:\n" + "${OUTPUT}\n\n") + endif() + endif() +endmacro() |