[Bug target/99499] build failure for android bionic toolchains. error: '_U' was not declared in this scope

[unlvsur at live dot com]

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.