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268 lines
10 KiB
268 lines
10 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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# This module is shared by multiple languages and compilers; use include guard
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if (__COMPILER_CMAKE_COMMON_COMPILER_MACROS)
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return()
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endif ()
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set(__COMPILER_CMAKE_COMMON_COMPILER_MACROS 1)
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# Check that a compiler's language standard is properly detected
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# Parameters:
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# lang - Language to check
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# stdver1 - Minimum version to set a given default for
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# std1 - Default to use for compiler ver >= stdver1
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# stdverN - Minimum version to set a given default for
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# stdN - Default to use for compiler ver >= stdverN
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#
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# The order of stdverN stdN pairs passed as arguments is expected to be in
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# monotonically increasing version order.
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#
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# Note:
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# This macro can be called with multiple version / std pairs to convey that
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# newer compiler versions may use a newer standard default.
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#
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# Example:
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# To specify that compiler version 6.1 and newer defaults to C++11 while
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# 4.8 <= ver < 6.1 default to C++98, you would call:
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#
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# __compiler_check_default_language_standard(CXX 4.8 98 6.1 11)
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#
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macro(__compiler_check_default_language_standard lang stdver1 std1)
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set(__std_ver_pairs "${stdver1};${std1};${ARGN}")
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string(REGEX REPLACE " *; *" " " __std_ver_pairs "${__std_ver_pairs}")
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string(REGEX MATCHALL "[^ ]+ [^ ]+" __std_ver_pairs "${__std_ver_pairs}")
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# If the compiler version is below the threshold of even having CMake
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# support for language standards, then don't bother.
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if (CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL "${stdver1}")
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if (NOT CMAKE_${lang}_COMPILER_FORCED)
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if (NOT CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT OR NOT DEFINED CMAKE_${lang}_EXTENSIONS_COMPUTED_DEFAULT)
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message(FATAL_ERROR "CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT and CMAKE_${lang}_EXTENSIONS_COMPUTED_DEFAULT should be set for ${CMAKE_${lang}_COMPILER_ID} (${CMAKE_${lang}_COMPILER}) version ${CMAKE_${lang}_COMPILER_VERSION}")
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endif ()
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set(CMAKE_${lang}_STANDARD_DEFAULT ${CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT})
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set(CMAKE_${lang}_EXTENSIONS_DEFAULT ${CMAKE_${lang}_EXTENSIONS_COMPUTED_DEFAULT})
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else ()
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list(REVERSE __std_ver_pairs)
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foreach (__std_ver_pair IN LISTS __std_ver_pairs)
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string(REGEX MATCH "([^ ]+) (.+)" __std_ver_pair "${__std_ver_pair}")
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set(__stdver ${CMAKE_MATCH_1})
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set(__std ${CMAKE_MATCH_2})
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# Compiler id was forced so just guess the defaults.
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if (CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL __stdver)
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if(NOT DEFINED CMAKE_${lang}_EXTENSIONS_DEFAULT)
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# Currently known compilers default to enabling extensions.
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set(CMAKE_${lang}_EXTENSIONS_DEFAULT ON)
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endif()
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if(NOT DEFINED CMAKE_${lang}_STANDARD_DEFAULT)
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set(CMAKE_${lang}_STANDARD_DEFAULT ${__std})
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endif()
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endif ()
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unset(__std)
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unset(__stdver)
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endforeach ()
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endif ()
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endif ()
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unset(__std_ver_pairs)
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endmacro()
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# Define to allow compile features to be automatically determined
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macro(cmake_record_c_compile_features)
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set(_result 0)
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if(_result EQUAL 0 AND DEFINED CMAKE_C23_STANDARD_COMPILE_OPTION)
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_has_compiler_features_c(23)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_C17_STANDARD_COMPILE_OPTION)
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_has_compiler_features_c(17)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_C11_STANDARD_COMPILE_OPTION)
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if(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_c(11)
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else()
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_record_compiler_features_c(11)
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endif()
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unset(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_C99_STANDARD_COMPILE_OPTION)
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if(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_c(99)
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else()
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_record_compiler_features_c(99)
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endif()
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unset(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_C90_STANDARD_COMPILE_OPTION)
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if(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_c(90)
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else()
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_record_compiler_features_c(90)
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endif()
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unset(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT)
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endif()
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endmacro()
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# Define to allow compile features to be automatically determined
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macro(cmake_record_cxx_compile_features)
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set(_result 0)
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX26_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cxx(26)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX23_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cxx(23)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX20_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cxx(20)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cxx(17)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION)
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if(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_cxx(14)
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else()
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_record_compiler_features_cxx(14)
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endif()
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unset(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX11_STANDARD_COMPILE_OPTION)
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if(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_cxx(11)
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else()
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_record_compiler_features_cxx(11)
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endif()
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unset(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX98_STANDARD_COMPILE_OPTION)
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if(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_cxx(98)
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else()
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_record_compiler_features_cxx(98)
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endif()
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unset(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT)
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endif()
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endmacro()
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macro(cmake_record_cuda_compile_features)
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set(_result 0)
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA26_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cuda(26)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA23_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cuda(23)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA20_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cuda(20)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA17_STANDARD_COMPILE_OPTION)
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_has_compiler_features_cuda(17)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA14_STANDARD_COMPILE_OPTION)
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if(CMAKE_CUDA14_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_cuda(14)
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else()
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_record_compiler_features_cuda(14)
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endif()
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unset(CMAKE_CUDA14_STANDARD__HAS_FULL_SUPPORT)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA11_STANDARD_COMPILE_OPTION)
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if(CMAKE_CUDA11_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_cuda(11)
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else()
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_record_compiler_features_cuda(11)
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endif()
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unset(CMAKE_CUDA11_STANDARD__HAS_FULL_SUPPORT)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CUDA03_STANDARD_COMPILE_OPTION)
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if(CMAKE_CUDA03_STANDARD__HAS_FULL_SUPPORT)
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_has_compiler_features_cuda(03)
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else()
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_record_compiler_features_cuda(03)
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endif()
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unset(CMAKE_CUDA03_STANDARD__HAS_FULL_SUPPORT)
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endif()
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endmacro()
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macro(cmake_record_hip_compile_features)
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set(_result 0)
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if(_result EQUAL 0 AND DEFINED CMAKE_HIP26_STANDARD_COMPILE_OPTION)
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_has_compiler_features_hip(26)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_HIP23_STANDARD_COMPILE_OPTION)
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_has_compiler_features_hip(23)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_HIP20_STANDARD_COMPILE_OPTION)
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_has_compiler_features_hip(20)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_HIP17_STANDARD_COMPILE_OPTION)
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_has_compiler_features_hip(17)
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endif()
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_has_compiler_features_hip(14)
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_has_compiler_features_hip(11)
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_has_compiler_features_hip(98)
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endmacro()
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function(cmake_create_cxx_import_std std variable)
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set(_cmake_supported_import_std_features
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# Compilers support `import std` in C++20 as an extension. Skip
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# for now.
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# 20
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23
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26)
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list(FIND _cmake_supported_import_std_features "${std}" _cmake_supported_import_std_idx)
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if (_cmake_supported_import_std_idx EQUAL "-1")
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Unsupported C++ standard: C++${std}\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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# If the target exists, skip. A toolchain file may have provided it.
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if (TARGET "__CMAKE::CXX${std}")
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return ()
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endif ()
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# The generator must support imported C++ modules.
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if (NOT CMAKE_GENERATOR MATCHES "Ninja")
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Unsupported generator: ${CMAKE_GENERATOR}\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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# Check if the compiler understands how to `import std;`.
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include("${CMAKE_ROOT}/Modules/Compiler/${CMAKE_CXX_COMPILER_ID}-CXX-CXXImportStd.cmake" OPTIONAL RESULT_VARIABLE _cmake_import_std_res)
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if (NOT _cmake_import_std_res)
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Toolchain does not support discovering `import std` support\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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if (NOT COMMAND _cmake_cxx_import_std)
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Toolchain does not provide `import std` discovery command\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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# Check the experimental flag. Check it here to avoid triggering warnings in
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# situations that don't support the feature anyways.
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set(_cmake_supported_import_std_experimental "")
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cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
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"CxxImportStd"
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_cmake_supported_import_std_experimental)
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if (NOT _cmake_supported_import_std_experimental)
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled (usually a `project()` call)\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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_cmake_cxx_import_std("${std}" target_definition)
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string(CONCAT guarded_target_definition
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"if (NOT TARGET \"__CMAKE::CXX${std}\")\n"
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"${target_definition}"
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"endif ()\n"
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"if (TARGET \"__CMAKE::CXX${std}\")\n"
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" list(APPEND CMAKE_CXX_COMPILER_IMPORT_STD \"${std}\")\n"
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"endif ()\n")
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set("${variable}" "${guarded_target_definition}" PARENT_SCOPE)
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endfunction()
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