Re: strict aliasing - Mailing list pgsql-hackers

From Florian Weimer
Subject Re: strict aliasing
Date
Msg-id 82r519wtod.fsf@mid.bfk.de
Whole thread Raw
In response to Re: strict aliasing (was: const correctness)  (Andres Freund <andres@anarazel.de>)
Responses Re: strict aliasing
List pgsql-hackers
* 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.)

--
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99


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