enable_language(C) enable_language(CXX) set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1) set(CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE "") add_library(not-cxx-source) target_sources(not-cxx-source PUBLIC FILE_SET fs TYPE CXX_MODULES FILES sources/c-anchor.c) target_compile_features(not-cxx-source PRIVATE cxx_std_20)