https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81587
--- Comment #3 from Jonny Grant <jg at jguk dot org> --- Ok. Had expected unused declarations to be a warning
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81587
--- Comment #3 from Jonny Grant <jg at jguk dot org> --- Ok. Had expected unused declarations to be a warning