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116 lines
4.5 KiB
116 lines
4.5 KiB
function (_cmake_cxx_import_std std variable)
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find_file(_msvc_modules_json_file
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NAME modules.json
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HINTS
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"$ENV{VCToolsInstallDir}/modules"
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PATHS
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"$ENV{INCLUDE}"
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"${CMAKE_CXX_COMPILER}/../../.."
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"${CMAKE_CXX_COMPILER}/../.." # msvc-wine layout
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PATH_SUFFIXES
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../modules
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NO_CACHE)
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# Without this file, we do not have modules installed.
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if (NOT EXISTS "${_msvc_modules_json_file}")
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Could not find `modules.json` resource\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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file(READ "${_msvc_modules_json_file}" _msvc_modules_json)
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string(JSON _msvc_json_version GET "${_msvc_modules_json}" "version")
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string(JSON _msvc_json_revision GET "${_msvc_modules_json}" "revision")
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# Require version 1.
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if (NOT _msvc_json_version EQUAL "1")
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"`modules.json` version ${_msvc_json_version}.${_msvc_json_revision} is not recognized\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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string(JSON _msvc_json_library GET "${_msvc_modules_json}" "library")
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# Bail if we don't understand the library.
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if (NOT _msvc_json_library STREQUAL "microsoft/STL")
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"`modules.json` library `${_msvc_json_library}` is not recognized\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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string(JSON _msvc_json_nmodules LENGTH "${_msvc_modules_json}" "module-sources")
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# Don't declare the target without any modules.
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if (NOT _msvc_json_nmodules)
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set("${variable}"
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"set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"`modules.json` does not list any available modules\")\n"
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PARENT_SCOPE)
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return ()
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endif ()
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# Declare the target.
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set(_msvc_std_target "")
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string(APPEND _msvc_std_target
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"add_library(__cmake_cxx${std} STATIC)\n")
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string(APPEND _msvc_std_target
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"target_sources(__cmake_cxx${std} INTERFACE \"$<$<STREQUAL:$<TARGET_PROPERTY:TYPE>,STATIC_LIBRARY>:$<TARGET_OBJECTS:__cmake_cxx${std}>>\")\n")
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string(APPEND _msvc_std_target
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"set_property(TARGET __cmake_cxx${std} PROPERTY EXCLUDE_FROM_ALL 1)\n")
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string(APPEND _msvc_std_target
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"set_property(TARGET __cmake_cxx${std} PROPERTY CXX_SCAN_FOR_MODULES 1)\n")
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string(APPEND _msvc_std_target
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"set_property(TARGET __cmake_cxx${std} PROPERTY CXX_MODULE_STD 0)\n")
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string(APPEND _msvc_std_target
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"target_compile_features(__cmake_cxx${std} PUBLIC cxx_std_${std})\n")
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set(_msvc_modules_module_paths "")
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get_filename_component(_msvc_modules_dir "${_msvc_modules_json_file}" DIRECTORY)
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# Add module sources.
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math(EXPR _msvc_modules_json_nmodules_range "${_msvc_json_nmodules} - 1")
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foreach (_msvc_modules_json_modules_idx RANGE 0 "${_msvc_modules_json_nmodules_range}")
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string(JSON _msvc_modules_json_module_source GET "${_msvc_modules_json}" "module-sources" "${_msvc_modules_json_modules_idx}")
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if (NOT IS_ABSOLUTE "${_msvc_modules_json_module_source}")
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string(PREPEND _msvc_modules_json_module_source "${_msvc_modules_dir}/")
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endif ()
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list(APPEND _msvc_modules_module_paths
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"${_msvc_modules_json_module_source}")
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endforeach ()
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# Split the paths into basedirs and module paths.
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set(_msvc_modules_base_dirs_list "")
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set(_msvc_modules_files "")
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foreach (_msvc_modules_module_path IN LISTS _msvc_modules_module_paths)
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get_filename_component(_msvc_module_dir "${_msvc_modules_module_path}" DIRECTORY)
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list(APPEND _msvc_modules_base_dirs_list
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"${_msvc_module_dir}")
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string(APPEND _msvc_modules_files
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" \"${_msvc_modules_module_path}\"")
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endforeach ()
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list(REMOVE_DUPLICATES _msvc_modules_base_dirs_list)
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set(_msvc_modules_base_dirs "")
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foreach (_msvc_modules_base_dir IN LISTS _msvc_modules_base_dirs_list)
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string(APPEND _msvc_modules_base_dirs
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" \"${_msvc_modules_base_dir}\"")
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endforeach ()
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# Create the file set for the modules.
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string(APPEND _msvc_std_target
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"target_sources(__cmake_cxx${std}
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PUBLIC
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FILE_SET std TYPE CXX_MODULES
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BASE_DIRS ${_msvc_modules_base_dirs}
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FILES ${_msvc_modules_files})\n")
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# Wrap the `__cmake_cxx${std}` target in a check.
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string(PREPEND _msvc_std_target
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"if (NOT TARGET \"__cmake_cxx${std}\")\n")
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string(APPEND _msvc_std_target
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"endif ()\n")
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string(APPEND _msvc_std_target
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"add_library(__CMAKE::CXX${std} ALIAS __cmake_cxx${std})\n")
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set("${variable}" "${_msvc_std_target}" PARENT_SCOPE)
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endfunction ()
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