Bug#473156: [checks/scripts] dash now supports $((cnt+1))
On Fri, 2008-03-28 at 19:23 +0000, Adam D. Barratt wrote:
> On Fri, 2008-03-28 at 11:59 -0700, Russ Allbery wrote:
> > "Adam D. Barratt" <adam@adam-barratt.org.uk> writes:
> >
> > > As far as I can see, it *is* in POSIX, which is what persuaded Herbert
> > > to (albeit slowly) add it to dash.
> >
> > Oh! Then the comment now makes sense to me, and by all means we should
> > remove this check. Thank you very much for this; I hadn't realized that
> > was a standard feature.
>
> It wasn't. Having just checked, SUS2 only requires $(($var+1)); $((var
> +1)) is an SUS3 addition.
In fact, having found a copy of the older SUSv3 editions, it's even more
recent.
SUSv3 2003 (i.e. IEEE 1003.1-2003) does not contain the requirement for
$(($var)) and $((var)) to be equivalent; that was added in the 2004
revision. As policy refers to the latter, however, that shouldn't be a
problem.
Regards,
Adam
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