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?
Thanks,
Ralf
Fix exit status of expr version of as_func_arith.
* lib/m4sugar/m4sh.m4 (_AS_VAR_ARITH_PREPARE): Count an exit
status of 1 of expr also as success, to avoid failure of the
computation result is zero. Fixes test failures with IRIX sh,
where the expr variant of as_func_arith is used.
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index f106e2d..56697ad 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -1743,6 +1743,7 @@
AS_IF([_AS_RUN(["AS_ESCAPE(m4_quote(_AS_VAR_ARITH_WORKS))"])],
[as_func_arith ()
{
as_val=`expr "$[]@"`
+ case $? in 0|1) :;; *) false;; esac
}]) # as_func_arith
])
