use -O1 when debugging, otherwise gcc ignores -Wuninitialized

ChangeLog

@@ -1,3 +1,11 @@
+2011-08-07  Robert Larice
+ * configure.ac :
+   use -O1 when debugging, otherwise gcc ignores -Wuninitialized
+   this is temporary, and certainly will confuse users of gdb
+   obviously somewhere around gcc version 4.4 the necessity to have
+     enable optimization for detecting uninitialized variables was dropped.
+     stable Debian's gcc is a 4.4 and still needs -O1 ...
+
 2011-08-06  Dietmar Warning
  * bsim4v4/b4v4set.c: fix missing model parameter defaults
  * b4check.c, b4v4check.c, b4v5check.c: add "4.x" as a short form for version

configure.ac

@@ -211,7 +211,7 @@ if test "$enable_debug" = "no"; then
 else
     AC_DEFINE(NGDEBUG,1,[Compile with debug info])
 	if test "x$GCC" = "xyes"; then
-		CFLAGS="$ext_CFLAGS -g -O0 -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wnested-externs -Wold-style-definition -Wredundant-decls -Wconversion"
+		CFLAGS="$ext_CFLAGS -g -O1 -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wnested-externs -Wold-style-definition -Wredundant-decls -Wconversion"
 	else
 		CFLAGS="$ext_CFLAGS -g"
 	fi