https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105709
--- Comment #8 from Sam James <sam at gentoo dot org> --- Let me try hack something to reduce but test with Clang where possible. It's hard because the mkspecs stuff which leaks into the preprocessed original source doesn't build with Clang. In the meantime, could you tell me if non-reduced-qt.cxx and non-reduced-qt.ii.xz work for you?