https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78902
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Martin Liška from comment #7) > > I also think warning on malloc(0) can be useful. GCC 7 has -Walloc-zero > > that warns on all zero-size allocations. Unfortunately, it's not in -Wall > > or -Wextra and has to be explicitly enabled. > > That's a pity, why was the option not enabled in either -Wall or -Wextra? I think one of the reasons was that it is a late warning, so it has similar problems -Wnonnull had, warning even just in cases where path isolation decided to isolate some call where it just isn't called with those arguments. So perhaps moving it to post_ipa_warn pass would help with that part.
