[Bug c++/109433] New: [12/13 Regression] ICE with -std=c++11 and static constexpr array inside a template constexpr

[Bug c++/109433] New: [12/13 Regression] ICE with -std=c++11 and static constexpr array inside a template constexpr

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109433

            Bug ID: 109433
           Summary: [12/13 Regression] ICE with -std=c++11 and static
                    constexpr array inside a template constexpr
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Note this is not exactly a dup of bug 109431 as it works in GCC 11.3.0.
Note also it ICEs with -std=c++14 in GCC 11.3.0 (which looks to be the same as
PR109431 ) but works with -std=c++11.

testcase:
```
struct RangeLimits
{
    int low = 1;
};

template <int>
int parameterLimits(void)
{
    static RangeLimits constexpr param_limits[ 2 ] = {};
    auto const &limits = param_limits[ 1 ];
    return 0;
}

auto s = parameterLimits<1>();
```

Maybe they are the same issue but I am not 100% sure as they regressed at
different times and produce different ICEs.

The ICE on the trunk:

<source>:10:55: internal compiler error: unexpected expression 'const
RangeLimits()' of kind cast_expr
   10 |     static RangeLimits constexpr param_limits[ 2 ] = {};
      |                                                       ^

[Bug c++/109433] [12/13 Regression] ICE with -std=c++11 and static constexpr array inside a template constexpr

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109433

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |12.3
           Keywords|                            |needs-bisection

[Bug c++/109433] [12/13 Regression] ICE with -std=c++11 and static constexpr array inside a template constexpr

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109433

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org
           Keywords|needs-bisection             |
             Status|UNCONFIRMED                 |NEW
           Priority|P3                          |P2
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-04-06

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With -std=c++11, started to ICE with r12-6326-ge948436eab818c527dd6.
With -std=c++14, started to ICE with r9-1483-g307193b82cecb8ab79cf.

[Bug c++/109433] [12/13 Regression] ICE with -std=c++11 and static constexpr array inside a template constexpr

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109433

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> With -std=c++11, started to ICE with r12-6326-ge948436eab818c527dd6.


> With -std=c++14, started to ICE with r9-1483-g307193b82cecb8ab79cf.

Yes that is exactly the same where PR 109431 started to ICE too.

[Bug c++/109433] [12/13/14 Regression] ICE with -std=c++11 and static constexpr array inside a template constexpr

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109433

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|12.3                        |12.4

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 12.3 is being released, retargeting bugs to GCC 12.4.