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There is a trend in the broader C++ community to use a different extension for module interface units, even though (in GCC) they are compiled in the same way as other source files. Let's recognize these extensions as C++. .ixx is the MSVC standard, while the .c*m are supported by Clang. libc++ standard headers use .cppm, as their other source files use .cpp. Perhaps libstdc++ might use .ccm for parallel consistency? One issue with .c++m is that libcpp/mkdeps.cc has been using it for the phony dependencies to express module dependencies, so I'm changing mkdeps to something less likely to be an actual file, ".c++-module". gcc/cp/ChangeLog: * lang-specs.h: Add module interface extensions. gcc/ChangeLog: * doc/invoke.texi: Update module extension docs. libcpp/ChangeLog: * mkdeps.cc (make_write): Change .c++m to .c++-module. gcc/testsuite/ChangeLog: * g++.dg/modules/dep-1_a.C * g++.dg/modules/dep-1_b.C * g++.dg/modules/dep-2.C: Change .c++m to .c++-module.