[Bug c++/103497] New: ICE when decltype(auto)... as parameters

[Bug c++/103497] New: ICE when decltype(auto)... as parameters

[hewillk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

            Bug ID: 103497
           Summary: ICE when decltype(auto)... as parameters
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

Feels like 12 regression.

void foo(decltype(auto)... args);

int main() {
  foo();
}

https://godbolt.org/z/PqWTWKc6b

[Bug c++/103497] [9/10/11/12 Regression] ICE when decltype(auto)... as parameters

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-11-30
             Status|UNCONFIRMED                 |NEW
                 CC|                            |mpolacek at gcc dot gnu.org
            Summary|ICE when decltype(auto)...  |[9/10/11/12 Regression] ICE
                   |as parameters               |when decltype(auto)... as
                   |                            |parameters
   Target Milestone|---                         |9.5
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r229722.

GCC 6 regression.  GCC 5:

$ xg++-5 -c -std=c++14 103497.C
103497.C:2:28: error: expansion pattern ‘decltype(auto)’ contains no argument
packs
 void foo(decltype(auto)... args);
                            ^

[Bug c++/103497] [9/10/11/12 Regression] ICE when decltype(auto)... as parameters

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

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

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

[Bug c++/103497] [10/11/12/13 Regression] ICE when decltype(auto)... as parameters

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |10.4

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9 branch is being closed

[Bug c++/103497] [10/11/12/13 Regression] ICE when decltype(auto)... as parameters

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.4                        |10.5

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.

[Bug c++/103497] [11/12/13/14 Regression] ICE when decltype(auto)... as parameters

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.5                        |11.5

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.

[Bug c++/103497] [11/12/13/14 Regression] ICE when decltype(auto)... as parameters

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

--- Comment #5 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:ca912a39cccdd990ef705768faa7311ac210b3f3

commit r14-2814-gca912a39cccdd990ef705768faa7311ac210b3f3
Author: Nathaniel Shead <nathanieloshead@gmail.com>
Date:   Fri Jun 30 17:05:24 2023 +1000

    c++: Fix ICE with parameter pack of decltype(auto) [PR103497]

    This patch ensures 'type_uses_auto' also checks for usages of 'auto' in
    parameter packs.

            PR c++/103497

    gcc/cp/ChangeLog:

            * pt.cc (type_uses_auto): Check inside parameter packs.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1y/decltype-auto-103497.C: New test.

    Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>

[Bug c++/103497] [11/12/13/14 Regression] ICE when decltype(auto)... as parameters

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103497

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

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

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed in GCC 14.