Re: AS_DIRNAME and expr

[Paul Eggert]

> From: Akim Demaille <address@hidden>
> Date: 10 Nov 2000 10:23:25 +0100
>
> But our troubles could be worse than this, since `expr' is not used
> only in AS_DIRNAME.  For instance any CVS configure contains
> 
>         ac_optarg=`expr "x$ac_option" : 'x[^=]*=\(.*\)'`

Ouch.  Can you rewrite that as follows to work around the bug?

# Work around the problem that "expr 'a' : 'a\(\)'" outputs "0" in QNX.
case "$ac_option" in
*=*=) ac_optarg=`expr "x$ac_option" : 'x[^=]*=\(.*\)'`;;
*=)   ac_optarg= ;;
*=*)  ac_optarg=`expr "x$ac_option" : 'x[^=]*=\(.*\)'`;;
*)    ac_optarg= ;;
esac