https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99499
--- Comment #5 from cqwrteur <unlvsur at live dot com> --- Created attachment 50356 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50356&action=edit ctype.h ctype.h actually provides those macros. but they said "Internal implementation detail. Do not use." I try to use these macros directly with a simple hello world program. These _CTYPE_XXX macros do not exist.
