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Paul Eggert authored
Original problem report by N. Jackson in: https://lists.gnu.org/r/emacs-devel/2020-03/msg00047.html I found some other warnings when I used gcc, and fixed them with this patch. * lib-src/etags.c: Include verify.h. (xnmalloc, xnrealloc): Tell the compiler that NITEMS is nononnegative and ITEM_SIZE is positive. * src/conf_post.h (__has_attribute_returns_nonnull) (ATTRIBUTE_RETURNS_NONNULL): New macros. * src/editfns.c (Fuser_full_name): Don’t assume Fuser_login_name returns non-nil. * src/intervals.c (rotate_right, rotate_left, update_interval): * src/intervals.h (LENGTH, LEFT_TOTAL_LENGTH, RIGHT_TOTAL_LENGTH): Use TOTAL_LENGTH0 or equivalent on intervals that might be null. * src/intervals.h (TOTAL_LENGTH): Assume arg is nonnull. (TOTAL_LENGTH0): New macro, with the old TOTAL_LENGTH meaning. (make_interval, split_interval_right): Add ATTRIBUTE_RETURNS_NONNULL. * src/pdumper.c (dump_check_dump_off): Now returns void, since no caller uses the return value. Redo assert to pacify GCC. (decode_emacs_reloc): Add a seemingly-random eassume to pacify GCC. Ugly, and I suspect due to a bug in GCC.
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