[Bug c/111809] New: GCC-14: internal error, internal compiler error: in release_function_body, at cgraph.cc:1805

[Bug c/111809] New: GCC-14: internal error, internal compiler error: in release_function_body, at cgraph.cc:1805

[141242068 at smail dot nju.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111809

            Bug ID: 111809
           Summary: GCC-14: internal error, internal compiler error: in
                    release_function_body, at cgraph.cc:1805
           Product: gcc
           Version: 14.0
            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: ---

Reproducer: https://godbolt.org/z/MP7qnTKz6

when compile this with `gcc-14 -O0 -fgimple`, gcc crashes:
```
inline __GIMPLE (ssa) void
bar (void)
{
  int _3;

__BB(2):
  return;
}
```

[Bug c/111809] GCC-14: internal error, internal compiler error: in release_function_body, at cgraph.cc:1805

[141242068 at smail dot nju.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111809

--- Comment #1 from wierton <141242068 at smail dot nju.edu.cn> ---
Full stack backtrace:

<source>: In function 'bar':
<source>:8:1: error: SSA name '<unknown>' with version 3 has no definition
    8 | }
      | ^
At top level:
cc1: internal compiler error: in release_function_body, at cgraph.cc:1805
0x22ff3ee internal_error(char const*, ...)
        ???:0
0x9fc0a8 fancy_abort(char const*, int, char const*)
        ???:0
0xbd8857 cgraph_node::release_body(bool)
        ???:0
0xbde851 cgraph_node::remove()
        ???:0
0xbe92d1 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.

[Bug c/111809] gimpleFE: unreferenced inline function with _GIMPLE(ssa) definition causes ICE

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111809

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-11-04
           Keywords|error-recovery,             |
                   |ice-on-invalid-code         |
             Status|UNCONFIRMED                 |NEW
            Summary|GIMPLEFE: ICE after `SSA    |gimpleFE: unreferenced
                   |name '<unknown>' with       |inline function with
                   |version 3 has no            |_GIMPLE(ssa) definition
                   |definition`                 |causes ICE
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
inline
__GIMPLE (ssa) void
bar (void)
{
__BB(2):
  return;
}
```

So basically it is due to the function be declared as inline (or static and
unused with -O1).

Confirmed.