[Bug libgcc/103004] [12 regression] r12-4416 breaks backtrace on PPC64 Big-endian

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103004

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I see this on powerpc64le-unknown-linux-gnu:

./md-unwind-support.h:398:6: warning: no previous prototype for
‘ppc_backchain_fallback’ [-Wmissing-prototypes]