https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28901
--- Comment #12 from Paul Eggert <eggert at gnu dot org> --- (In reply to Manuel López-Ibáñez from comment #11) > Another alternative is to only warn if the variable is defined in the main > file (MAIN_FILE_P) as opposed to an included file. Thanks, this is a reasonable suggestion; it would fix the cry-wolf problem for tzcode, which is what prompted me to object to the original proposal. The alternative of littering the code with many instances of __attribute__ ((unused)) (or is it __attribute ((used)? I can never remember) is less appealing.
