Re: expr ... and `expr ...` return different results on QNX 4.2.5

[Pavel Roskin]

Hello!

> Yes.  I wouldn't bother doing that.  Just tell them to get a working
> shell.  You have to draw the line somewhere.

That's correct. We cannot support command.com anyway :-)

> If you want to quote chapter and verse, you can tell them that
> POSIX.2-1992 section 3.9.1 page 136 lines 755-759 says that x=`FOO`
> must yield FOO's exit status.  Any shell that doesn't do this is
> seriously broken.

That's not the autoconf's way. The autoconf's way is to find a better
shell on that system, e.g. /bin/sh5 or /bin/ksh. If it fails then it's Ok
for autoconf to fail.

But I still hope to work around those issues with QNX 4.25 somehow.
How about this:

ac_output=`command || echo "===ERROR==="`
case $ac_output in
  *===ERROR===)
    AC_MSG_ERROR([command failed]) ;;
  *) ;;
esac

Regards,
Pavel Roskin