Re: Working os/2 configuratie

[Gary V. Vaughan]

Hi Eric,

On 21 Apr 2008, at 22:29, Eric Blake wrote:
> According to Gary V. Vaughan on 4/21/2008 5:36 PM:
> |> +if test "${M4MODPATH+set}" = set ; then
> |> +  M4MODPATH="@abs_top_builddir@/modules:$M4MODPATH"
> |> +else
> |> +  M4MODPATH="@abs_top_builddir@/modules"
> |> +fi
> |
> | M4MODPATH="@abs_top_builddir@/modules${M4MODPATH+:$M4MODPATH}"
>
> I thought about that, but is it portable to all shells?

The : is part of the expansion, so using M4MODPATH="stuff${M4MODPATH 
+stuff}"
is no different to 'if test "${M4MODPATH+stuff}" = stuff'

> Then again, maybe I was just misreading
> http://www.gnu.org/software/autoconf/manual/autoconf.html#Shell-Substitutions
> about restrictions against non-portable ${a:+b}.


Yeah, shell variable expansions are far too numerous to hold in your  
head
all at the same time! :-)

Cheers,
        Gary
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