https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80942
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- The documentation explicitly says -Wpedantic includes some warnings about things outside of ISO C, beyond those that violate syntax rules or constraints. (Sometimes this only applies in conjunction with other options, e.g. -Wformat -Wpedantic.) Where long strings are acceptable I'd suggest -Wpedantic -Wno-overlength-strings (if that doesn't work, it's a bug). Just as there's e.g. -Wpedantic -Wno-long-long if building in pedantic C90 mode but wanting to use long long (though in the long long case, diagnostics *are* required for C90).
