[Bug c++/100899] New: internal compiler error: in retrieve_specialization, at cp/pt.c:1240

[Bug c++/100899] New: internal compiler error: in retrieve_specialization, at cp/pt.c:1240

[hans.p.erickson at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100899

            Bug ID: 100899
           Summary: internal compiler error: in retrieve_specialization,
                    at cp/pt.c:1240
           Product: gcc
           Version: 10.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hans.p.erickson at gmail dot com
  Target Milestone: ---

Created attachment 50923
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50923&action=edit
Preprocessed output

Some template code that I am working on causes an internal compiler error with
the gcc 10 series of compilers. Based on some experimentation with the Compiler
Explorer site at godbolt.org it appears that this affects 10.1, 10.2, and 10.3,
but doesn't affect version 9 compilers or version 11 compilers. The link to the
code at godbolt.org is https://godbolt.org/z/svWW5Tq4r . The pre-processor
output that I've attached is from 10.2.

The attached output is from a compiler with the following properties:
  gcc version 10.2.0 (GCC)
  Target: x86_64-pc-linux-gnu
  Configured with: ./configure --prefix=/home/hans/.local --enable-multilib

[Bug c++/100899] internal compiler error: in retrieve_specialization, at cp/pt.c:1240

[hans.p.erickson at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100899

Hans Erickson <hans.p.erickson at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hans.p.erickson at gmail dot com

--- Comment #1 from Hans Erickson <hans.p.erickson at gmail dot com> ---
Created attachment 50924
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50924&action=edit
Source code for regression testing (if useful)

[Bug c++/100899] [10 Regression] internal compiler error: in retrieve_specialization, at cp/pt.c:1240

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100899

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-06-07
      Known to fail|                            |10.1.0, 10.2.0, 10.3.0
   Target Milestone|---                         |10.4
            Summary|internal compiler error: in |[10 Regression] internal
                   |retrieve_specialization, at |compiler error: in
                   |cp/pt.c:1240                |retrieve_specialization, at
                   |                            |cp/pt.c:1240
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=99009
                 CC|                            |ppalka at gcc dot gnu.org
      Known to work|                            |11.1.0, 9.4.0

--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Confirmed.  GCC 9 accepts the testcase.  We began ICEing on it after r10-4719. 
We began accepting it again after r11-7483.

Reduced:

template <typename> class Grammar {
public:
  template <typename...> class Sequence {};
};
enum ValueType {};
class JsonGrammar : Grammar<ValueType> {
  void integer() { Sequence(); }
};

[Bug c++/100899] [10 Regression] internal compiler error: in retrieve_specialization, at cp/pt.c:1240

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100899

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++/100899] [10 Regression] internal compiler error: in retrieve_specialization, at cp/pt.c:1240

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100899

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|10.5                        |11.0
      Known to fail|                            |10.5.0
             Status|NEW                         |RESOLVED

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed in GCC 11.