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7c38e6bb52
Add a variable to indicate the latest standard known to be supported for
each language:
* `CMAKE_C_STANDARD_LATEST`
* `CMAKE_CXX_STANDARD_LATEST`
* `CMAKE_CUDA_STANDARD_LATEST`
* `CMAKE_HIP_STANDARD_LATEST`
* `CMAKE_OBJC_STANDARD_LATEST`
* `CMAKE_OBJCXX_STANDARD_LATEST`
These variables, more generally referred to as
`CMAKE_<LANG>_STANDARD_LATEST`, are assigned an integer value which
represents the minimum between the latest version of the associated
language standard supported by the current compiler and the latest
version supported by CMake.
Add documentation for these variables in a new page called
`CMAKE_<LANG>_STANDARD_LATEST` was added under the "Variables for
Languages" section of the `cmake-variables(7)` page.
Update each compiler-specific CMake script under
`${CMAKE_ROOT}\Modules\Compiler` to manually define the relevant
`CMAKE_<LANG>_STANDARD_LATEST` variable as necessary. This will
require updating and maintaining as newer compiler versions become
recognized by CMake.
Closes: #25717
104 lines
4.0 KiB
CMake
104 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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include(Compiler/MSVC)
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__compiler_msvc(CXX)
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include(Compiler/CMakeCommonCompilerMacros)
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if ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.0.24215.1 AND
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CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.10) OR
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CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.10.25017)
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# VS 2015 Update 3 and above support language standard level flags,
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# with the default and minimum level being C++14.
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set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
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set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std:c++14")
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set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std:c++14")
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if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.11.25505)
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set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
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set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
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set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++17")
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set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++17")
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else()
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set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++latest")
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set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++latest")
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endif()
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set(CMAKE_CXX_STANDARD_LATEST 17)
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if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.29.30129)
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set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std:c++20")
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set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std:c++20")
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set(CMAKE_CXX23_STANDARD_COMPILE_OPTION "-std:c++latest")
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set(CMAKE_CXX23_EXTENSION_COMPILE_OPTION "-std:c++latest")
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set(CMAKE_CXX_STANDARD_LATEST 23)
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.12.25835)
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set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std:c++latest")
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set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std:c++latest")
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set(CMAKE_CXX_STANDARD_LATEST 20)
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endif()
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__compiler_check_default_language_standard(CXX 19.0 14)
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elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
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# MSVC has no specific options to set language standards, but set them as
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# empty strings anyways so the feature test infrastructure can at least check
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# to see if they are defined.
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set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "")
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set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "")
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set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "")
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if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.0)
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set(CMAKE_CXX_STANDARD_LATEST 17)
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elseif(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 18.0)
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set(CMAKE_CXX_STANDARD_LATEST 14)
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else()
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set(CMAKE_CXX_STANDARD_LATEST 11)
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endif()
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# There is no meaningful default for this
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set(CMAKE_CXX_STANDARD_DEFAULT "")
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# There are no compiler modes so we only need to test features once.
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# Override the default macro for this special case. Pretend that
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# all language standards are available so that at least compilation
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# can be attempted.
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macro(cmake_record_cxx_compile_features)
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list(APPEND CMAKE_CXX_COMPILE_FEATURES
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cxx_std_98
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cxx_std_11
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cxx_std_14
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cxx_std_17
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cxx_std_20
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cxx_std_23
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cxx_std_26
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)
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_record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES)
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endmacro()
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endif()
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if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "19.34")
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string(CONCAT CMAKE_CXX_SCANDEP_SOURCE
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"<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> <SOURCE> -nologo -TP"
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" -showIncludes"
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" -scanDependencies <DYNDEP_FILE>"
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" -Fo<OBJECT>")
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set(CMAKE_CXX_SCANDEP_DEPFILE_FORMAT "msvc")
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set(CMAKE_CXX_MODULE_MAP_FORMAT "msvc")
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set(CMAKE_CXX_MODULE_MAP_FLAG "@<MODULE_MAP_FILE>")
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set(CMAKE_CXX_MODULE_BMI_ONLY_FLAG "-ifcOnly;-ifcOutput;<OBJECT>")
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endif ()
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