Re: cvs commit: src/lib/libc/gen disklabel.c src/lib/libcr/gen d
On Fri, Mar 18, 2005 at 12:44:42AM +0900, YONETANI Tomokazu wrote:
> On Thu, Mar 17, 2005 at 03:26:42PM +0100, Joerg Sonnenberger wrote:
> > > Constify all users of dktypenames to unbreak buildworld.
> > > Reported-by: walt
> >
> > I'm not sure why world broke through. That's strange.
>
> I should've been more explicit about what I claimed to fix. gcc fails
> miserably if one tries to get a difference of two addresses whose target
> types are different and there's no implicit conversions available, so:
>
> const char **ccpp;
> char **cpp;
> int idx;
>
> idx = cpp - ccpp; /* NG */
> idx = *cpp - *ccpp; /* OK, *cpp converted to (const char *) */
> idx = *ccpp - *cpp; /* NG, (const char *) to (char *) */
This is what I meant. I have to read the specs again, this feels strange.
But the conversions rules _are_ strange, so it might very well be OK.
Joerg
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