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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110896] New: [12/13/14 Regression]
 gcc.dg/ubsan/pr81981.c is xfailed
Date: Thu, 03 Aug 2023 22:46:49 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: diagnostic, xfail
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110896

            Bug ID: 110896
           Summary: [12/13/14 Regression] gcc.dg/ubsan/pr81981.c is
                    xfailed
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: diagnostic, xfail
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 24639
  Target Milestone: ---

The original issue in PR 81981 is fixed. The problem here is we don't even =
warn
without -fsanitize=3Dundefined too.
Testcase from that PR:
```
int foo (int i)
{
  int t[1], u[1];
  int n =3D 0;

  if (i)
    {
      t[n] =3D i;
      u[0] =3D i;
    }

  return t[0] + u[0];
}

```
we don't warn about `u[0]` being unintinialized with just `-O2 -Wall -Wextr=
a`
starting in GCC 12 via r12-4625 (the fix for pr102681). That is the issue is
unrelated to -fsanitize=3Dundefined now.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D24639
[Bug 24639] [meta-bug] bug to track all Wuninitialized issues=