forked from mpusz/mp-units
120 lines
4.3 KiB
CMake
120 lines
4.3 KiB
CMake
# The MIT License (MIT)
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#
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# Copyright (c) 2018 Mateusz Pusz
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#[=======================================================================[.rst:
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CheckCXXFeatureSupported
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------------------------
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Check if a C++ feature is supported.
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.. command:: check_cxx_feature_supported
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.. code-block:: cmake
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check_cxx_feature_supported(<condition> <variable>)
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Check that the ``<condition>`` is true and store the result in a ``<variable>``.
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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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For example:
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.. code-block:: cmake
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include(CheckCXXFeatureSupported)
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check_cxx_feature_supported(__cpp_explicit_this_parameter EXPLICIT_THIS_PARAMETER_SUPPORTED)
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check_cxx_feature_supported("__cpp_constexpr >= 202211L" STATIC_CONSTEXPR_VARS_IN_CONSTEXPR_FUNCTIONS)
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#]=======================================================================]
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cmake_minimum_required(VERSION 3.25)
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include_guard(GLOBAL)
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macro(CHECK_CXX_FEATURE_SUPPORTED CONDITION VARIABLE)
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if(NOT DEFINED "${VARIABLE}" OR "x${${VARIABLE}}" STREQUAL "x${VARIABLE}")
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set(_CFS_SOURCE "/* */\n")
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set(MACRO_CHECK_FEATURE_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
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if(CMAKE_REQUIRED_LINK_OPTIONS)
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set(CHECK_FEATURE_EXISTS_LINK_OPTIONS LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
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else()
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set(CHECK_FEATURE_EXISTS_LINK_OPTIONS)
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endif()
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if(CMAKE_REQUIRED_LIBRARIES)
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set(CHECK_FEATURE_EXISTS_LIBS LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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else()
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set(CHECK_FEATURE_EXISTS_LIBS)
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endif()
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if(CMAKE_REQUIRED_INCLUDES)
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set(CMAKE_FEATURE_EXISTS_INCLUDES "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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else()
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set(CMAKE_FEATURE_EXISTS_INCLUDES)
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endif()
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string(APPEND _CFS_SOURCE "#include <version>\n")
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string(APPEND
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_CFS_SOURCE
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"
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int main()
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{
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static_assert(${CONDITION});
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}\n"
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)
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_START "Checking C++ feature test macro '${CONDITION}'")
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endif()
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try_compile(
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${VARIABLE} SOURCE_FROM_VAR
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"CheckFeatureExists.cxx" _CFS_SOURCE
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} ${CHECK_FEATURE_EXISTS_LINK_OPTIONS}
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${CHECK_FEATURE_EXISTS_LIBS}
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FEATURE_EXISTS_FLAGS}
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"${CMAKE_FEATURE_EXISTS_INCLUDES}"
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)
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if(${VARIABLE})
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_PASS "SUCCESS")
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endif()
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set(${VARIABLE} 1 CACHE INTERNAL "C++ feature test macro '${CONDITION}' supported")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_FAIL "FAIL")
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endif()
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set(${VARIABLE} "" CACHE INTERNAL "C++ feature test macro '${CONDITION}' supported")
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endif()
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unset(_CFS_SOURCE)
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endif()
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endmacro()
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