[Bug c++/108833] New: internal compiler error: Segmentation fault (GCC 12.1.1)

[Bug c++/108833] New: internal compiler error: Segmentation fault (GCC 12.1.1)

[liavonlida at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

            Bug ID: 108833
           Summary: internal compiler error: Segmentation fault (GCC
                    12.1.1)
           Product: gcc
           Version: 12.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: liavonlida at gmail dot com
  Target Milestone: ---

Created attachment 54480
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54480&action=edit
I tried to make the sample minimal.

Compilation fails with Segmentation fault.


<source>:250:8: internal compiler error: Segmentation fault
  250 |   s >> range;
      |        ^~~~~
0x1bb069e internal_error(char const*, ...)
        ???:0
0x87ce73 instantiate_decl(tree_node*, bool, bool)
        ???:0
0x898f3b instantiate_pending_templates(int)
        ???:0
0x7a4928 c_parse_final_cleanups()
        ???:0


I checked other versions at godbolt.org:

gcc 12.1.0          -> ok
gcc 12.1.1          -> fail      <<- my case with gcc-toolset-12 on Rocky Linux
8.7
gcc 12.2.0          -> fail
gcc trunk(13.0.1)   -> ok

Minimal code is attached

[Bug c++/108833] [12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|internal compiler error:    |[12 Regression] internal
                   |Segmentation fault (GCC     |compiler error:
                   |12.1.1)                     |Segmentation fault (GCC
                   |                            |12.1.1)
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |12.3
   Last reconfirmed|                            |2023-02-17
           Keywords|                            |ice-on-valid-code,
                   |                            |needs-bisection,
                   |                            |needs-reduction
     Ever confirmed|0                           |1
      Known to work|                            |12.1.0, 13.0
      Known to fail|                            |12.2.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

[Bug c++/108833] [12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection             |
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems to have been fixed by

commit e8ed26c2ac38ab1f6ed5a627d9089a9243e06a0c
Author: Jason Merrill <jason@redhat.com>
Date:   Tue Jun 7 15:52:30 2022 -0400

    c++: non-templated friends [PR105852]

[Bug c++/108833] [12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase:
struct input_t {
  template <class T> struct range_t {
    friend int &operator>>(int &, range_t &);
    range_t(char);
  };
  int read_s;
  void read() {
    range_t<double> range(':');
    read_s >> range;
  }
};
int &operator>>(int &, input_t::range_t<double> &);

[Bug c++/108833] [12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-reduction             |

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note, even latest 12 branch ICEs on this.  Tried various trunk snapshots from
13-1 up to latest in steps of ~ 500 and nothing ICEs though, so we'd need
bisection on the branch.

[Bug c++/108833] [12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
20220507 works (Fedora 12.1.1-1), 20230210 ICEs, on godbolt 12.2 ICEs
(supposedly 20220819), 20220628 ICEs (Fedora 12.1.1-2).

[Bug c++/108833] [12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, to be exact, this ICE has been introduced by
r12-8467-ge057d454db4dcf48c22f75e57599f797d8e55baf
on the 12 branch.

[Bug c++/108833] [11/12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[12 Regression] internal    |[11/12 Regression] internal
                   |compiler error:             |compiler error:
                   |Segmentation fault (GCC     |Segmentation fault (GCC
                   |12.1.1)                     |12.1.1)
   Target Milestone|12.3                        |11.4

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, on the trunk r13-1017 also started to ICE on this testcase (r13-1016 was
fine),
but already r13-1018 fixed that.  While r13-1017 was backported to 12 and 11
branches (current 11.x ICEs too), r13-1018 was not.

[Bug c++/108833] [11/12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Therefore, likely dup of PR106740, but I think we want reduced testcases from
both PRs on the trunk and on branches eventually when it is fixed there too.

[Bug c++/108833] [11/12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Better reduced testcase that doesn't emit a warning:
struct input_t {
  template <class T> struct range_t {
    friend int &operator>>(int &, range_t<double> &);
    range_t(char);
  };
  int read_s;
  void read() {
    range_t<double> range(':');
    read_s >> range;
  }
};
int &operator>>(int &, input_t::range_t<double> &);

[Bug c++/108833] [11/12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug c++/108833] [11/12 Regression] internal compiler error: Segmentation fault (GCC 12.1.1)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108833

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|11.4                        |11.5

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 11.4 is being released, retargeting bugs to GCC 11.5.