FreeBSD sh clears $? on empty lines in trap

[Pavel Roskin]

Hello!

The shell in FreeBSD 4.0 has the following bug - $? is reset to 0 by empty
lines if the code in inside "trap".

-------------------
#! /bin/sh
trap 'false

echo $?' 0
exit
-------------------

The shell script above prints 0 on FreeBSD. This doesn't apply to the
normal code, only to the code inside the "trap" command.

The patch below fixes the testsuite on FreeBSD if GNU sed is present
(otherwise we need one more patch).

ChangeLog:
        * acgeneral.m4 (_AC_INIT_PREPARE): Don't use a newline before
        accessing $? - newlines in "trap" reset $? to 0 on FreeBSD 4.0.

____________________
Index: acgeneral.m4
--- acgeneral.m4        Wed Oct 25 23:40:35 2000
+++ acgeneral.m4        Sat Oct 28 13:59:18 2000
@@ -1931,8 +1931,7 @@
 
 # When interrupted or exit'd, cleanup temporary files, and complete
 # config.log.
-trap '
-  exit_status=$?
+trap 'exit_status=$?
   test "$ac_signal" != 0 &&
     echo "configure: caught signal $ac_signal" >&AC_FD_LOG
   echo "configure: exit $exit_status" >&AC_FD_LOG
____________________

Regards,
Pavel Roskin