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set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")
string(CONCAT CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE
"<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E -x c++ <SOURCE>"
" -MT <DYNDEP_FILE> -MD -MF <DEP_FILE>"
" -fmodules-ts -fdeps-file=<DYNDEP_FILE> -fdeps-target=<OBJECT> -fdeps-format=p1689r5"
" -o <PREPROCESSED_SOURCE>")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FORMAT "gcc")
string(CONCAT CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG
# Turn on modules.
"-fmodules-ts"
# Read the module mapper file.
" -fmodule-mapper=<MODULE_MAP_FILE>"
# Make sure dependency tracking is enabled (missing from `try_*`).
" -MD"
# Suppress `CXX_MODULES +=` from generated depfile snippets.
" -fdeps-format=p1689r5"
# Force C++ as a language.
" -x c++")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_BMI_ONLY_FLAG "-fmodule-only")
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