[Bug libstdc++/103305] Cannot build libstdc++ with newlib on aarch64-none-elf or bfin-elf with new version of newlib

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103305

--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The sim code should be fixed, period. It currently has undefined behaviour.

If the newlib change is still desirable, it would be nice if it was conditional
on the __GNUC__ version, so old versions of GCC can still be built. Maybe just
do this in <ctype.h>:

#if __GNUC__ < 12
#include <ctype_.h>
#endif

So the old macros are still defined.