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c/727: Warning bug if -O0?

To: gcc-gnats at gcc dot gnu dot org
Subject: c/727: Warning bug if -O0?
From: dedu at ese-metz dot fr
Date: 3 Nov 2000 09:53:20 -0000
Reply-To: dedu at ese-metz dot fr
Resent-Cc: gcc-prs at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org
Resent-Reply-To: gcc-gnats@gcc.gnu.org, dedu@ese-metz.fr

>Number:         727
>Category:       c
>Synopsis:       Warning bug if -O0?
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 03 01:56:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Eugen Dedu
>Release:        Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs  gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
>Organization:
>Environment:
Linux 2.2.14-5
i686
>Description:
gcc simply does not print some warnings when not optimizing.

The code below was compiled with:
gcc -Wall test.c

Here is the output of the compiler:
eminescu:~/work$ gcc -Wall test.c -O0
eminescu:~/work$ gcc -Wall test.c -O1
test.c: In function `main':
test.c:6: warning: `type2' might be used uninitialized in this function
eminescu:~/work$ gcc -Wall test.c -O2
test.c: In function `main':
test.c:6: warning: `type2' might be used uninitialized in this function
eminescu:~/work$ gcc -Wall test.c -O3
test.c: In function `main':
test.c:6: warning: `type2' might be used uninitialized in this function

Ok, so the problem is why did not gcc print the warning when compiling
without optimization?

Thanks,
Eugen
>How-To-Repeat:
#include <stdio.h>

int main (void)
{
  int type;
  int type2;
  for (type=0 ; type<10 ; type++)
    type2++;
  printf ("%d\n", type2);
  return 0;
}
>Fix:
Use optimization.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="test.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="test.i"

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