https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99312
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to ktkachov from comment #2) > We intend to deprecate that macro going forward as it's not a useful way for > testing architecture features in aarch64. It made sense in the pre-Armv7-a > days, but now the recommended way to test for features is the __ARM_FEATURE* > macros. Which is interesting because x86 is going in the opposite direction and having ISA "levels". > > The scheme is also not very well-suited for things like the recent AArch64 > Armv8-R. > > Is there a particular use case that you have in mind? A customer was asking for how to detect the ISA Level at compile time and runtime.
