[Bug target/71216] [4.9/5/6/7 Regression] Incorrect PPC assembly due to inserted .machine pseudo-op

["segher at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71216

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Rin Okuyama from comment #9)
> > > However, I have a question on this fix. How about the case where
> > > "-Wa,-mXXX" option is given without "-mcpu=YYY" option specified?
> > 
> > That might or might not work; the user had better know what he is
> > doing if he uses an assembler option.
> 
> Hmm, I understand. Is this documented explicitly anywhere?

Not in so many words I think, no.

> > GCC does not support -me500, right.  You need to configure your compiler
> > for a powerpc-*-eabispe* target as far as I know (I'm no expert on this).
> 
> We use -Wa,-me500 option to compile kernel on some machines. As they
> share userland with other machines, we cannot configure GCC for a
> powerpc-*-eabispe* target. Instead, I found a workaround to specify
> -mcpu=powerpc option. It passes -mppc option to assembler, but as it
> is preceding to -me500, the latter is prior to the former.

Maybe you could use -mcpu=e500mc or similar?  Or, GCC should probably
have a -mcpu=e500 option, but someone has to write the code for it.