On Fri, 16 Sep 2016, Richard Biener wrote:

> Humm ... do we anywhere compare to those global trees by pointer equivalence?
> If so then it breaks LTO support for those types.

The C front end compares main variants to those types for handling usual 
arithmetic conversions (and more generally for type compatibility), but 
that's not relevant to LTO.  I don't think there should be such 
comparisons outside the front ends.

Joseph S. Myers

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