Re: strict aliasing

* Andres Freund:

> I don't gcc will ever be able to call all possible misusages. E.g. The
> List api is a case where its basically impossible to catch everything
> (as gcc won't be able to figure out what the ListCell.data.ptr_value
> pointed to originally in the general case).

Correct, if code is not strict-aliasing-safe and you compile with
-f-strict-aliasing, GCC may silently produce wrong code.  (Same with
-fwrapv, by the way.)

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