https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87407
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> --- It's probably inconvenient for C indeed (pre-dating C99 inline). Even GCC has too many static inlines in headers. I agree that we can warn for static inline declarations with locations that are not in any included file (not sure how exactly to verify that).
