[Bug c++/108559] New: A new crash with using a simple class, inheritance and a function

[Bug c++/108559] New: A new crash with using a simple class, inheritance and a function

[zakkariusr at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

            Bug ID: 108559
           Summary: A new crash with using a simple class, inheritance and
                    a function
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zakkariusr at gmail dot com
  Target Milestone: ---

The following code:

struct A {
    int g = 0;

    A() {}
    A(const A&) {}
};

struct B : A {};

A u() { return A{}; }

int bug() { return B{u()}.g; }

int main() {
    return 0;
}

causes a compiler crash on the current gcc(trunk) 13.0

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
      Known to fail|                            |13.0
           Keywords|                            |ice-on-valid-code
            Summary|A new crash with using a    |[13 Regression] A new crash
                   |simple class, inheritance   |with using a simple class,
                   |and a function              |inheritance and a function
      Known to work|                            |12.2.0
   Target Milestone|---                         |13.0
   Last reconfirmed|                            |2023-01-26
             Status|UNCONFIRMED                 |NEW
                 CC|                            |jason at gcc dot gnu.org

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed, started with r13-3175

 c++: track whether we expect a TARGET_EXPR to be elided

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This might be related to C++ core issue cwg2403: https://wg21.link/cwg2403

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> This might be related to C++ core issue cwg2403: https://wg21.link/cwg2403

Indeed.  We don't expect the copy to be elided because of that issue, but we
are eliding it anyway.  So this is a bug caught by the added checking.

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:b533084d756a2696a3eb6521810e0a0b2182a8e8

commit r13-5611-gb533084d756a2696a3eb6521810e0a0b2182a8e8
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Jan 30 18:18:54 2023 -0500

    c++: aggregate base and TARGET_EXPR_ELIDING_P [PR108559]

    We also need to split up a CONSTRUCTOR in cp_genericize_init if we need to
    add extra copy constructor calls to deal with CWG2403.

            PR c++/108559

    gcc/cp/ChangeLog:

            * cp-gimplify.cc (any_non_eliding_target_exprs): New.
            (cp_genericize_init): Check it.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/aggr-base13.C: New test.

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.

[Bug c++/108559] [13 Regression] A new crash with using a simple class, inheritance and a function

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108559

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** Bug 108627 has been marked as a duplicate of this bug. ***