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