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From: "geoffreydgr at icloud dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/109190] New: GCC Static Analyzer cannot handle the
 initialization of an array with a for loop
Date: Sun, 19 Mar 2023 08:57:40 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: analyzer
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: geoffreydgr at icloud dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109190

            Bug ID: 109190
           Summary: GCC Static Analyzer cannot handle the initialization
                    of an array with a for loop
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: geoffreydgr at icloud dot com
  Target Milestone: ---

I got a false negative error when compiling the following program with
gcc(trunk) -fanalyzer -O0 in https://godbolt.org/z/KvoxvPq5c. When I replace
the array `m` with the variable `a` (https://godbolt.org/z/jTzo9bEo9), the =
NPD
appears.

```c
#include "stdio.h"
int main() {
    int i =3D 0;
    int *g =3D &i;
    int m[1];

    for (int j =3D 0; j < 1; j++) {
         m[j] =3D 0;
    }

    if (m[0])
        ;
    else
        g =3D m[i];

    printf("NPD_FLAG\n");
    *g =3D 1;
}
```=