It's also broken the build of the glibc testsuite, e.g.: ../time/time.h:88:15: error: mismatch in argument 1 type of built-in function 'strftime'; expected 'char *' [-Werror=builtin-declaration-mismatch] 88 | extern size_t strftime (char *__restrict __s, size_t __maxsize,
(presence or absence of qualifiers on a parameter is not part of the function type and should not be compared here). -- Joseph S. Myers jos...@codesourcery.com