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Re: [PATCH/RFC] Support for spec predicate expressions

Remember, though, that specs are processed by the driver, not the
compiler.  A lot of code would need to be replicated outside of
mips.c, and linked into xgcc, to do this.  OTOH, that's what *I* want
to do with it too ;-) (but not for mips).

We could handle compile-time defaults easier too:

	%{!arch: %:default(arch)}
	%{!cpu: %:default(cpu)}
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