https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101172
Bug ID: 101172
Summary: [12 regression] ICE Segmentation fault
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: anbu1024.me at gmail dot com
Target Milestone: ---
$ cat 36.c
union U
{
int a[3];
struct
{
int a : 3;
struct this_struct var;
} b;
};
const union U hello = {.a = {1, 2, 3}};
void foo()
{
int x = hello.b.a;
}
-------------------------------------------------------------------------------
$ gcc-sp12 --version
gcc (GCC) 12.0.0 20210620 (experimental)
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-------------------------------------------------------------------------------
$ gcc-sp12 36.c
36.c:8:24: error: field ‘var’ has incomplete type
8 | struct this_struct var;
| ^~~
36.c: In function ‘foo’:
36.c:17:18: internal compiler error: Segmentation fault
17 | int x = hello.b.a;
| ~~~~~~~^~
0xe600af crash_signal
../../gcc-12-20210620/gcc/toplev.c:327
0xb85ab1 fold_const_aggregate_ref_1(tree_node*, tree_node* (*)(tree_node*))
../../gcc-12-20210620/gcc/gimple-fold.c:8184
0xb86e49 fold_const_aggregate_ref(tree_node*)
../../gcc-12-20210620/gcc/gimple-fold.c:8250
0xb86e49 maybe_fold_reference
../../gcc-12-20210620/gcc/gimple-fold.c:333
0xb8bc86 fold_gimple_assign
../../gcc-12-20210620/gcc/gimple-fold.c:483
0xb8bc86 fold_stmt_1
../../gcc-12-20210620/gcc/gimple-fold.c:6250
0xbd1071 gimplify_modify_expr
../../gcc-12-20210620/gcc/gimplify.c:5982
0xbb909f gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc-12-20210620/gcc/gimplify.c:14094
0xbbc9f6 gimplify_stmt(tree_node**, gimple**)
../../gcc-12-20210620/gcc/gimplify.c:6865
0xbbe8d6 gimplify_and_add(tree_node*, gimple**)
../../gcc-12-20210620/gcc/gimplify.c:494
0xbbe8d6 internal_get_tmp_var
../../gcc-12-20210620/gcc/gimplify.c:647
0xbb887e get_formal_tmp_var(tree_node*, gimple**)
../../gcc-12-20210620/gcc/gimplify.c:668
0xbb887e gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc-12-20210620/gcc/gimplify.c:15083
0xbb9363 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc-12-20210620/gcc/gimplify.c:14399
0xbd0dff gimplify_modify_expr
../../gcc-12-20210620/gcc/gimplify.c:5806
0xbb909f gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc-12-20210620/gcc/gimplify.c:14094
0xbbc9f6 gimplify_stmt(tree_node**, gimple**)
../../gcc-12-20210620/gcc/gimplify.c:6865
0xbc3c9d gimplify_and_add(tree_node*, gimple**)
../../gcc-12-20210620/gcc/gimplify.c:494
0xbc3c9d gimplify_decl_expr
../../gcc-12-20210620/gcc/gimplify.c:1831
0xbb939a gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../gcc-12-20210620/gcc/gimplify.c:14291
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
-------------------------------------------------------------------------------
$ gcc-sp11 --version
gcc (GCC) 11.1.1 20210619
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-------------------------------------------------------------------------------
$ gcc-sp11 36.c
36.c:8:24: error: field ‘var’ has incomplete type
8 | struct this_struct var;
| ^~~
36.c:17: confused by earlier errors, bailing out
