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From: "141242068 at smail dot nju.edu.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/115644] New: [gcc][trunk] ICE if redeclare a variable with
 different type
Date: Tue, 25 Jun 2024 12:54:41 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 15.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115644

            Bug ID: 115644
           Summary: [gcc][trunk] ICE if redeclare a variable with
                    different type
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: 141242068 at smail dot nju.edu.cn
  Target Milestone: ---

Quick verification link: https://gcc.godbolt.org/z/fdY8KqhK6

The testing program:
```
void foo ()
{
  int p[5];
  int v =3D *p;
  int *p =3D 0;
}
```

Compiling this program using gcc-trunk will trigger crash, and dump stacks =
as
follows:
```
0x23be10c internal_error(char const*, ...)
        ???:0
0x8948df tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        ???:0
0xd120d0 gimple_fold_indirect_ref(tree_node*)
        ???:0
0xd5b8f7 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*=
),
int)
        ???:0
0xd5f06a gimplify_stmt(tree_node**, gimple**)
        ???:0
0xd5c472 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*=
),
int)
        ???:0
0xd5f06a gimplify_stmt(tree_node**, gimple**)
        ???:0
0xd5c75b gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*=
),
int)
        ???:0
0xd5f06a gimplify_stmt(tree_node**, gimple**)
        ???:0
0xd5bf2a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*=
),
int)
        ???:0
0xd651b3 gimplify_body(tree_node*, bool)
        ???:0
0xd655f9 gimplify_function_tree(tree_node*)
        ???:0
0xb87377 cgraph_node::analyze()
        ???:0
0xb8a6d1 symbol_table::finalize_compilation_unit()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
```=