Re: Fix exit status of expr version of as_func_arith.

[Eric Blake]

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According to Ralf Wildenhues on 11/16/2008 12:53 PM:
> OK?  Posix rules are: zero exit status for nonzero result, 1 for zero
> result, other for other errors (such as invalid input).  The Autoconf
> manual lists that QNX expr may exit 1 instead of 0.  Other pitfalls
> we may have overlooked?

Looks okay to me.  Note, however, that bash doesn't change status to
non-zero on $(()) failure:

$ echo $((+))
bash: +: syntax error: operand expected (error token is "+")
$ echo $?
0

so we can't really make as_func_arith a reliable way to detect ill-formed
input.

>     * lib/m4sugar/m4sh.m4 (_AS_VAR_ARITH_PREPARE): Count an exit
>     status of 1 of expr also as success, to avoid failure of the

s/of the/if the/

>     computation result is zero.  Fixes test failures with IRIX sh,
>     where the expr variant of as_func_arith is used.
> 

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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