https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97264
--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> --- On Thu, 1 Oct 2020, slyfox at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97264 > > --- Comment #3 from Sergei Trofimovich <slyfox at gcc dot gnu.org> --- > Oh, that makes sense. > > > void __vfscanf_internal__ (const char *f, __builtin_va_list argptr) > > { > > /* assume input: "1<>\0" */ > > while (*f != '\0') > > { > > const unsigned char ** pstr = (const unsigned char **) &f; > > comes from > https://sourceware.org/git/?p=glibc.git;a=blob;f=stdio-common/vfscanf-internal.c;h=95b46dcbeb55b1724b396f02a940f3047259b926;hb=HEAD#l489 > : > > """ > 274 int > 275 __vfscanf_internal (FILE *s, const char *format, va_list argptr, > 276 unsigned int mode_flags) > ... > 487 if (ISDIGIT ((UCHAR_T) *f)) > 488 { > 489 argpos = read_int ((const UCHAR_T **) &f); > """ >From this little context it eventually makes sense to declare 'f' as const unsigned char * in this function.
