signed.m4 again

[Ralf Wildenhues]

Hello Bruno,

Sorry to have overlooked this the last time, but signed.m4 still
produces a wrong result with
  CC='gcc -Wall -Werror -fno-builtin'

| conftest.c: In function 'main':
| conftest.c:193: warning: 'x' is used uninitialized in this function
| configure:17021: $? = 1

How about this patch?

Cheers,
Ralf

2006-10-12  Ralf Wildenhues  <address@hidden>

        * m4/signed.m4 (bh_C_SIGNED): Avoid uninitialized variable
        warning.

Index: m4/signed.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/signed.m4,v
retrieving revision 1.5
diff -u -r1.5 signed.m4
--- m4/signed.m4        22 Sep 2006 20:10:26 -0000      1.5
+++ m4/signed.m4        12 Oct 2006 18:30:52 -0000
@@ -1,4 +1,4 @@
-# signed.m4 serial 2
+# signed.m4 serial 3
 dnl Copyright (C) 2001-2002, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,7 +9,7 @@
 AC_DEFUN([bh_C_SIGNED],
 [
   AC_CACHE_CHECK([for signed], bh_cv_c_signed,
-   [AC_TRY_COMPILE(, [signed char x; return !x;],
+   [AC_TRY_COMPILE(, [signed char x; return !sizeof x;],
       bh_cv_c_signed=yes, bh_cv_c_signed=no)])
   if test $bh_cv_c_signed = no; then
     AC_DEFINE(signed, ,