https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101941
--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Other ideas for fixing: (a) (hackish workaround?): defer emitting diagnostics from __attribute__((__error__)) and __attribute__((__warning__)) until a postprocessing stage, after all functions have been emitted, and then determine which functions are actually reachable, and only emit the diagnostics if the functions are callable (b) add an interprocedural sync-up before "final", so that we do an interprocedural elimination of uncallable internal functions before emitting assembler, and move the attribute diagnostics from "expand" to "final".
