https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64644
--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- (In reply to Harald van Dijk from comment #2) > A question, though: I see that like many other existing warnings, this > doesn't handle -Werror=pedantic. Is that something that should be addressed > as well, or is that something that should at some later point be handled for > all relevant warnings at once? From: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#Warning-Options -pedantic-errors Give an error whenever the base standard (see -Wpedantic) requires a diagnostic, in some cases where there is undefined behavior at compile-time and in some other cases that do not prevent compilation of programs that are valid according to the standard. This is not equivalent to -Werror=pedantic, since there are errors enabled by this option and not enabled by the latter and vice versa. From: https://gcc.gnu.org/wiki/DiagnosticsGuidelines pedwarn is for code that is accepted by GCC but it should be rejected or diagnosed according to the current standard, or it conflicts with the standard (either the default or the one selected by -std=). Most pedwarns are controlled by -Wpedantic, a few are controlled by options that are enabled by -Wpedantic and others are enabled by default. That is, although -Wpedantic is only used for pedwarns, the choice between using pedwarn or warning is independent of -Wpedantic and only depends on the current -std= value. In my ideal world, -pedantic-errors would be a deprecated (but forever kept for backwards compatibility) alias of some -Werror=X, where X is either pedantic or a new -W option. However, the difference between pedwarn(), -Wpedantic and -pedantic-errors is not very straightforward. You can try to follow the discussion here: https://gcc.gnu.org/ml/gcc-patches/2014-10/msg01799.html and if you manage to make some sense out of it and come up with a course of action (which option to add? what should it enable? what should be its relation with Wpedantic and -pedantic-errors?) that convinces Joseph Myers, please add it to PR53075 and I will eventually implement it.
