[Bug libgcc/123976] GCC 15.2.0 (libgcc) does not build on PPC Mac OS X 10.5.8, Leopard, because of missing "md-unwind-def.h"

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123976

--- Comment #121 from Iain Sandoe <iains at gcc dot gnu.org> ---

OK.. so if you have a theory on what specific change or configuration option
breaks the build - that is exactly what you need to test .. and then we have
something concrete to debug and fix.