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From: "kdudka at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/104308] New: no location info provided for
 [-Wanalyzer-use-of-uninitialized-value] warnings
Date: Mon, 31 Jan 2022 15:09:57 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: analyzer
X-Bugzilla-Version: 12.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104308

            Bug ID: 104308
           Summary: no location info provided for
                    [-Wanalyzer-use-of-uninitialized-value] warnings
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: kdudka at redhat dot com
  Target Milestone: ---

I can see new (technically valid) analyzer warnings with gcc-12 on Fedora
rawhide without any location information being provided.  This makes the ou=
tput
difficult to use for csdiff utilities as well as human reviewers:

$ printf '#include <string.h>\nint main() { char s[5]; memmove(s, s + 1, 2);
}\n' | gcc -fanalyzer -fdiagnostics-path-format=3Dseparate-events -c -xc -
In function =E2=80=98main=E2=80=99:
cc1: warning: use of uninitialized value =E2=80=98*(short unsigned int *)&s=
 + 1=E2=80=99
[CWE-457] [-Wanalyzer-use-of-uninitialized-value]
cc1: note: (1) use of uninitialized value =E2=80=98*(short unsigned int *)&=
s + 1=E2=80=99 here

The same command produces no output with gcc-11.2.1 though.=