https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117664
--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> --- (In reply to Sam James from comment #1) > GCC trunk now defaults to -std=gnu23. C23 removes unprototyped functions, so > `void foo()` now means `void foo(void)`. Thanks, Sam, for the immediate reply. Is that backward compatible with standards like e.g. C11?