libstdc++ atomicity.h and ppc405 problem

[Dan Kegel]

Dan Kegel wrote:
> Is there a way I can force libstdc++ to be compiled with the appropriate 
> -mcpu option?

I'm now reading about gcc's "multilibs" build option.
Perhaps if I edit gcc/config/rs6000/t-rs6000 to read

MULTILIB_OPTIONS = mcpu=405 msoft-float

instead of just

MULTILIB_OPTIONS = msoft-float

I would get both generic and ppc405-specific versions?

Does that affect libstdc++ builds as well as libgcc builds?

Sigh.  I'm such a gcc newbie.
- Dan