https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110805
--- Comment #3 from Jochen Hiller <jo.hiller+gcc at gmail dot com> --- > Gcc's module support is still experimental. Sure. Nevertheless reporting bugs may help to come from experimental to stable. I mainly do prototype development using C++ modules with Clang 16, but trying regularly to get it working with Gcc as well. On my list is as well to check MSVC state of implementation.