Re: [PATCH 2/2] config.status: minimize use of $tmp

[Paul Eggert]

On 08/30/10 09:41, Eric Blake wrote:
> -  { test ! -d "${ac_tmp:=$tmp}" || rm -fr "$ac_tmp"; } && exit $exit_status
> 
> +  : "${ac_tmp:=$tmp}"
> +  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status

I agree with Ralf on this point.  That is,
I don't know of any shells where this change is needed, and
in POSIX-conforming shells this change is not needed.  I wouldn't
bother with changes like this unless there is a known and
significant shell with the bug in question.