https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89072
--- Comment #5 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- Note that -Wall -Werror seem to be fine in general when they are used alone, but this combination can be very problematic when other options are used, such as -std=c90 -pedantic, and other warnings. So default errors need to be restricted, e.g. rather with something like -Werror=all. But in any case, there are currently warnings in -Wall that should not be turned into errors by default, e.g. those related to code style (such as -Wlogical-not-parentheses) and heuristics (such as -Wmaybe-uninitialized).
