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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110031] [10/11/12/13/14 Regression] ICE with deprecated
 attribute and NTTP and diagnostic for deprecated printed out so much
Date: Tue, 30 May 2023 03:49:47 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.1.0
X-Bugzilla-Keywords: diagnostic, ice-checking
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.5
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: everconfirmed target_milestone cf_reconfirmed_on
 cf_known_to_work short_desc keywords bug_status cf_known_to_fail
Message-ID: <bug-110031-4-cHJKg6eeiK@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110031-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110031-4@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110031

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Target Milestone|---                         |10.5
   Last reconfirmed|                            |2023-05-30
      Known to work|                            |7.1.0
            Summary|ICE: error reporting        |[10/11/12/13/14 Regression]
                   |routines re-entered on      |ICE with deprecated
                   |non-type template argument  |attribute and NTTP and
                   |and C++20+                  |diagnostic for deprecated
                   |                            |printed out so much
           Keywords|                            |diagnostic, ice-checking
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |8.1.0

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Better testcase which fails with -std=3Dc++17 even earlier than GCC 8.
```
template <typename T>
[[deprecated]]=20
inline constexpr bool t =3D true ;

template <bool a>
struct enableif;

template<>
struct enableif<true>
{
        using y =3D int;
};
template <bool a>
using enableif_t =3D typename enableif<a>::y;

template <typename T, enableif_t<t<T>> =3D 0>
struct A {  A(T &&)  {  }};

template <typename T>
struct A<T> {
  A(T &&) =3D delete;
  A() =3D delete;
};

int main(void)
{
  A<double> a(5.3);
  return 0;
}
```=