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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
# This module is shared by multiple languages and compilers; use include guard
if (__COMPILER_CMAKE_COMMON_COMPILER_MACROS)
return()
endif ()
set(__COMPILER_CMAKE_COMMON_COMPILER_MACROS 1)
# Check that a compiler's language standard is properly detected
# Parameters:
# lang - Language to check
# stdver1 - Minimum version to set a given default for
# std1 - Default to use for compiler ver >= stdver1
# stdverN - Minimum version to set a given default for
# stdN - Default to use for compiler ver >= stdverN
#
# The order of stdverN stdN pairs passed as arguments is expected to be in
# monotonically increasing version order.
#
# Note:
# This macro can be called with multiple version / std pairs to convey that
# newer compiler versions may use a newer standard default.
#
# Example:
# To specify that compiler version 6.1 and newer defaults to C++11 while
# 4.8 <= ver < 6.1 default to C++98, you would call:
#
# __compiler_check_default_language_standard(CXX 4.8 98 6.1 11)
#
macro(__compiler_check_default_language_standard lang stdver1 std1)
set(__std_ver_pairs "${stdver1};${std1};${ARGN}")
string(REGEX REPLACE " *; *" " " __std_ver_pairs "${__std_ver_pairs}")
string(REGEX MATCHALL "[^ ]+ [^ ]+" __std_ver_pairs "${__std_ver_pairs}")
# If the compiler version is below the threshold of even having CMake
# support for language standards, then don't bother.
if (CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL "${stdver1}")
if (NOT CMAKE_${lang}_COMPILER_FORCED)
if (NOT CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT OR NOT DEFINED CMAKE_${lang}_EXTENSIONS_COMPUTED_DEFAULT)
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}")
endif ()
set(CMAKE_${lang}_STANDARD_DEFAULT ${CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT})
set(CMAKE_${lang}_EXTENSIONS_DEFAULT ${CMAKE_${lang}_EXTENSIONS_COMPUTED_DEFAULT})
else ()
list(REVERSE __std_ver_pairs)
foreach (__std_ver_pair IN LISTS __std_ver_pairs)
string(REGEX MATCH "([^ ]+) (.+)" __std_ver_pair "${__std_ver_pair}")
set(__stdver ${CMAKE_MATCH_1})
set(__std ${CMAKE_MATCH_2})
# Compiler id was forced so just guess the defaults.
if (CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL __stdver)
if(NOT DEFINED CMAKE_${lang}_EXTENSIONS_DEFAULT)
# Currently known compilers default to enabling extensions.
set(CMAKE_${lang}_EXTENSIONS_DEFAULT ON)
endif()
if(NOT DEFINED CMAKE_${lang}_STANDARD_DEFAULT)
set(CMAKE_${lang}_STANDARD_DEFAULT ${__std})
endif()
endif ()
unset(__std)
unset(__stdver)
endforeach ()
endif ()
endif ()
unset(__std_ver_pairs)
endmacro()
# Define to allow compile features to be automatically determined
macro(cmake_record_c_compile_features)
set(_result 0)
if(_result EQUAL 0 AND DEFINED CMAKE_C23_STANDARD_COMPILE_OPTION)
_has_compiler_features_c(23)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_C17_STANDARD_COMPILE_OPTION)
_has_compiler_features_c(17)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_C11_STANDARD_COMPILE_OPTION)
if(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_c(11)
else()
_record_compiler_features_c(11)
endif()
unset(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_C99_STANDARD_COMPILE_OPTION)
if(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_c(99)
else()
_record_compiler_features_c(99)
endif()
unset(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_C90_STANDARD_COMPILE_OPTION)
if(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_c(90)
else()
_record_compiler_features_c(90)
endif()
unset(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT)
endif()
endmacro()
# Define to allow compile features to be automatically determined
macro(cmake_record_cxx_compile_features)
set(_result 0)
if(_result EQUAL 0 AND DEFINED CMAKE_CXX26_STANDARD_COMPILE_OPTION)
_has_compiler_features_cxx(26)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CXX23_STANDARD_COMPILE_OPTION)
_has_compiler_features_cxx(23)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CXX20_STANDARD_COMPILE_OPTION)
_has_compiler_features_cxx(20)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION)
_has_compiler_features_cxx(17)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION)
if(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_cxx(14)
else()
_record_compiler_features_cxx(14)
endif()
unset(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CXX11_STANDARD_COMPILE_OPTION)
if(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_cxx(11)
else()
_record_compiler_features_cxx(11)
endif()
unset(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CXX98_STANDARD_COMPILE_OPTION)
if(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_cxx(98)
else()
_record_compiler_features_cxx(98)
endif()
unset(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT)
endif()
endmacro()
macro(cmake_record_cuda_compile_features)
set(_result 0)
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA26_STANDARD_COMPILE_OPTION)
_has_compiler_features_cuda(26)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA23_STANDARD_COMPILE_OPTION)
_has_compiler_features_cuda(23)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA20_STANDARD_COMPILE_OPTION)
_has_compiler_features_cuda(20)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA17_STANDARD_COMPILE_OPTION)
_has_compiler_features_cuda(17)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA14_STANDARD_COMPILE_OPTION)
if(CMAKE_CUDA14_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_cuda(14)
else()
_record_compiler_features_cuda(14)
endif()
unset(CMAKE_CUDA14_STANDARD__HAS_FULL_SUPPORT)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA11_STANDARD_COMPILE_OPTION)
if(CMAKE_CUDA11_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_cuda(11)
else()
_record_compiler_features_cuda(11)
endif()
unset(CMAKE_CUDA11_STANDARD__HAS_FULL_SUPPORT)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_CUDA03_STANDARD_COMPILE_OPTION)
if(CMAKE_CUDA03_STANDARD__HAS_FULL_SUPPORT)
_has_compiler_features_cuda(03)
else()
_record_compiler_features_cuda(03)
endif()
unset(CMAKE_CUDA03_STANDARD__HAS_FULL_SUPPORT)
endif()
endmacro()
macro(cmake_record_hip_compile_features)
set(_result 0)
if(_result EQUAL 0 AND DEFINED CMAKE_HIP26_STANDARD_COMPILE_OPTION)
_has_compiler_features_hip(26)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_HIP23_STANDARD_COMPILE_OPTION)
_has_compiler_features_hip(23)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_HIP20_STANDARD_COMPILE_OPTION)
_has_compiler_features_hip(20)
endif()
if(_result EQUAL 0 AND DEFINED CMAKE_HIP17_STANDARD_COMPILE_OPTION)
_has_compiler_features_hip(17)
endif()
_has_compiler_features_hip(14)
_has_compiler_features_hip(11)
_has_compiler_features_hip(98)
endmacro()
function(cmake_create_cxx_import_std std variable)
set(_cmake_supported_import_std_features
# Compilers support `import std` in C++20 as an extension. Skip
# for now.
# 20
23
26)
list(FIND _cmake_supported_import_std_features "${std}" _cmake_supported_import_std_idx)
if (_cmake_supported_import_std_idx EQUAL "-1")
set("${variable}"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Unsupported C++ standard: C++${std}\")\n"
PARENT_SCOPE)
return ()
endif ()
# If the target exists, skip. A toolchain file may have provided it.
if (TARGET "__CMAKE::CXX${std}")
return ()
endif ()
# The generator must support imported C++ modules.
if (NOT CMAKE_GENERATOR MATCHES "Ninja")
set("${variable}"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Unsupported generator: ${CMAKE_GENERATOR}\")\n"
PARENT_SCOPE)
return ()
endif ()
# Check if the compiler understands how to `import std;`.
include("${CMAKE_ROOT}/Modules/Compiler/${CMAKE_CXX_COMPILER_ID}-CXX-CXXImportStd.cmake" OPTIONAL RESULT_VARIABLE _cmake_import_std_res)
if (NOT _cmake_import_std_res)
set("${variable}"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Toolchain does not support discovering `import std` support\")\n"
PARENT_SCOPE)
return ()
endif ()
if (NOT COMMAND _cmake_cxx_import_std)
set("${variable}"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Toolchain does not provide `import std` discovery command\")\n"
PARENT_SCOPE)
return ()
endif ()
# Check the experimental flag. Check it here to avoid triggering warnings in
# situations that don't support the feature anyways.
set(_cmake_supported_import_std_experimental "")
cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
"CxxImportStd"
_cmake_supported_import_std_experimental)
if (NOT _cmake_supported_import_std_experimental)
set("${variable}"
"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled (usually a `project()` call)\")\n"
PARENT_SCOPE)
return ()
endif ()
_cmake_cxx_import_std("${std}" target_definition)
string(CONCAT guarded_target_definition
"if (NOT TARGET \"__CMAKE::CXX${std}\")\n"
"${target_definition}"
"endif ()\n"
"if (TARGET \"__CMAKE::CXX${std}\")\n"
" list(APPEND CMAKE_CXX_COMPILER_IMPORT_STD \"${std}\")\n"
"endif ()\n")
set("${variable}" "${guarded_target_definition}" PARENT_SCOPE)
endfunction()
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