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enable_language(CXX)
set(info "")
# See `Modules/Compiler/MSVC-CXX.cmake` for this. If there is explicitly no
# default, the feature list is populated to be everything.
if (DEFINED CMAKE_CXX_STANDARD_DEFAULT AND
CMAKE_CXX_STANDARD_DEFAULT STREQUAL "")
set(CMAKE_CXX_COMPILE_FEATURES "")
endif ()
# Detect if the environment forces a C++ standard, let the test selection know.
set(forced_cxx_standard 0)
if (CMAKE_CXX_FLAGS MATCHES "-std=")
set(forced_cxx_standard 1)
endif ()
macro (cxx_check_import_std version)
set(have_cxx${version}_import_std 0)
if ("${version}" IN_LIST CMAKE_CXX_COMPILER_IMPORT_STD)
set(have_cxx${version}_import_std 1)
endif ()
if (TARGET "__CMAKE:CXX${version}" AND NOT have_cxx${version}_import_std)
message(FATAL_ERROR
"The toolchain's C++${version} target exists, but the user variable does "
"not indicate it.")
endif ()
endmacro ()
cxx_check_import_std(23)
cxx_check_import_std(26)
# Forward information about the C++ compile features.
string(APPEND info "\
set(CMAKE_CXX_COMPILE_FEATURES \"${CMAKE_CXX_COMPILE_FEATURES}\")
set(CMAKE_MAKE_PROGRAM \"${CMAKE_MAKE_PROGRAM}\")
set(forced_cxx_standard \"${forced_cxx_standard}\")
set(have_cxx23_import_std \"${have_cxx23_import_std}\")
set(CMAKE_CXX_COMPILER_VERSION \"${CMAKE_CXX_COMPILER_VERSION}\")
set(CMAKE_CXX_OUTPUT_EXTENSION \"${CMAKE_CXX_OUTPUT_EXTENSION}\")
set(CXXModules_default_build_type \"${CMAKE_BUILD_TYPE}\")
set(CMAKE_CXX_STANDARD_DEFAULT \"${CMAKE_CXX_STANDARD_DEFAULT}\")
set(CMAKE_CXX20_STANDARD_COMPILE_OPTION \"${CMAKE_CXX20_STANDARD_COMPILE_OPTION}\")
set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT \"${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}\")
set(CMAKE_CXX_MODULE_MAP_FORMAT \"${CMAKE_CXX_MODULE_MAP_FORMAT}\")
")
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/info.cmake" "${info}")
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