Patch for bug 25524 (-imultilib)

[Mark Mitchell]

Joseph S. Myers wrote:
> This patch fixes bug 25524, target-specific libstdc++ headers should
> also be multilib-specific, by adding a -imultilib option as proposed
> in that bug.
> 
> Bootstrapped with no regressions on x86_64-unknown-linux-gnu.  OK to
> commit?

OK, but please allow 24 hours for the libstdc++ maintainers to object to
those bits.

> +  const char multilib;		/* FNAME should have the multilib path
> +				   specified with -imultilib
> +				   appended.  */

At some point, maybe these should become "const bool", instead of "const
char", but it's fine to keep them consistent until then.

Thanks,

-- 
Mark Mitchell
CodeSourcery
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