| From: | Kurt Roeckx <Q(at)ping(dot)be> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Neil Conway <neilc(at)samurai(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: compile warnings in CVS HEAD? |
| Date: | 2003-09-04 17:14:08 |
| Message-ID: | 20030904171408.GA14879@ping.be |
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| Lists: | pgsql-hackers |
On Wed, Sep 03, 2003 at 10:30:05PM -0400, Tom Lane wrote:
>
> > tablecmds.c: In function `validateForeignKeyConstraint':
> > tablecmds.c:3546: warning: dereferencing type-punned pointer will break
> > strict-aliasing rules
>
> Hm. Got any idea what these are really complaining about? I see no
> such gripes with the gcc versions I use, but I wouldn't be surprised
> if gcc 3.3 is trying to tighten up.
It's about optimisation.
The compiler is free to assume that 2 pointers of a different
type never point to the same variable.
It basicly happens when you cast a pointer of 1 type to an other.
See the gcc info page for a little more information.
The recommended way to deal with is to put them into a union.
Kurt
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