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