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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/97175] New: ice in maybe_warn_for_bound, at builtins.c:3483
Date: Wed, 23 Sep 2020 09:13:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97175

            Bug ID: 97175
           Summary: ice in maybe_warn_for_bound, at builtins.c:3483
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

For this C source code:

int a, b;
int *c;
void d() {
  while (a > 0)
    ;
  c =3D malloc(1);
  strncpy(c, b, a);
}

compiled by recent gcc trunk and compiler flag -O2, does this:

during RTL pass: expand
bug642.c:7:3: internal compiler error: tree check: expected tree that conta=
ins
=E2=80=98
decl minimal=E2=80=99 structure, have =E2=80=98ssa_name=E2=80=99 in maybe_w=
arn_for_bound, at
builtins.c:
3483
0xfb13c0 tree_contains_struct_check_failed(tree_node const*,
tree_node_structure
_enum, char const*, int, char const*)
        ../../trunk.git/gcc/tree.c:9902
0x74e77b contains_struct_check(tree_node*, tree_node_structure_enum, char
const*
, int, char const*)
        ../../trunk.git/gcc/tree.h:3413
0x74e77b maybe_warn_for_bound(int, unsigned int, tree_node*, tree_node*,
tree_no
de**, tree_node*, access_data const*)
        ../../trunk.git/gcc/builtins.c:3483
0x74d796 check_access(tree_node*, tree_node*, tree_node*, tree_node*,
tree_node*
, access_mode, access_data const*)

The bug first seems to occur sometime between 20200827 and 20200829.=