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From: "yronglin777 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110175] New: [GCC][Crash] GCC Crash on valid code
Date: Thu, 08 Jun 2023 14:28:04 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110175

            Bug ID: 110175
           Summary: [GCC][Crash] GCC Crash on valid code
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yronglin777 at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/Wf7M89v8x

```
template<class T> auto f(T t) -> decltype(++t) { return t; }
void f(...) {}
void g() { f(true); }
```

```
internal compiler error: error reporting routines re-entered.
0x23b8691 warning_at(unsigned int, int, char const*, ...)
        ???:0
0xd39208 cp_build_unary_op(tree_code, tree_node*, bool, int)
        ???:0
0xacd484 build_new_op(op_location_t const&, tree_code, int, tree_node*,
tree_node*, tree_node*, tree_node*, tree_node**, int)
        ???:0
0xd370e3 build_x_unary_op(unsigned int, tree_code, cp_expr, tree_node*, int)
        ???:0
0xcb685f tsubst(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x23d8a2c pp_format(pretty_printer*, text_info*)
        ???:0
0x23d9c3d pp_format_verbatim(pretty_printer*, text_info*)
        ???:0
0x23d9d25 pp_verbatim(pretty_printer*, char const*, ...)
        ???:0
0x23b7895 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info=
*)
        ???:0
0x23b8691 warning_at(unsigned int, int, char const*, ...)
        ???:0
0xd45bf1 check_return_expr(tree_node*, bool*)
        ???:0
0xcef6a3 finish_return_stmt(tree_node*)
        ???:0
0xcaf2f8 instantiate_decl(tree_node*, bool, bool)
        ???:0
0xcda84b instantiate_pending_templates(int)
        ???:0
0xb8e905 c_parse_final_cleanups()
        ???:0
0xdbe998 c_common_parse_file()
        ???: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.
Compiler returned: 1
```

If remove the function body of 2 `f` functions, GCC will works well.
```
template<class T> auto f(T t) -> decltype(++t);
void f(...);
void g() { f(true); }
```=