+= in bourne scripts

[Dan Nicholson]

On Sat, Feb 14, 2009 at 9:41 AM, James Cloos <cloos at jhcloos.com> wrote:
>>>>>> "Jeremy" == Jeremy Huddleston <jeremyhu at freedesktop.org> writes:
>
> Jeremy> I've been seeing some '+=' syntax in some bourne scripts lately,
>
> Jeremy> And now I see that libX11/acinclude.m4 hass it as well:
> Jeremy> http://trac.macports.org/ticket/18485
>
> Damn.  I thought I had fixed that.
>
> I added dolt to libX11 just before the revelation that += needed to be
> replaced.  Commit b4b5893f has been pushed with the same change which
> was made to the dolt script in xserver:
>
> -        *) args+=("$arg")
> +        *) args@<:@${#args[@]}@:>@="$arg" ;;
>
> My understanding is that that should be compatible with Bourne shells in
> general.
>
> Thanks for the heads up!

That doesn't really work. doltlibtool and doltcompile are bash
scripts. So, in the first place, this won't cause a problem for
non-bash because those systems will just use regular libtool (look at
the top where it checks for bash). And the new syntax is still bash.
Bourne shells can't use arrays.

--
Dan