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Re: [trunk][patch] Don't print warnings in mangle_decl

Mark Mitchell wrote: 
I don't know how much of this reaches the ME at present, but the FE
should be able to track reachability and avoid passing on lots of stuff.
We don't need to convert to GENERIC, GIMPLE, etc. just to find out that
a function is never called.

Yep, it should be possible to defer calling cp_genericize for vague linkage functions until we know we care about them.

That may mean that we're not going to have "instantiated from here"
tracebacks.  But, I think that's OK.

For mangling issues, yeah.

Jason

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