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From: "lh_mouse at 126 dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109464] gcc does not instantiate constructor for explicitly
 instantiated template
Date: Tue, 11 Apr 2023 04:44:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109464

LIU Hao <lh_mouse at 126 dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |10.4.0, 9.5.0

--- Comment #4 from LIU Hao <lh_mouse at 126 dot com> ---
Manually reduced testcase:
(godbolt: https://gcc.godbolt.org/z/YsaoM78vM)

```
template<typename T>
struct shallow
 {
   int len;
   constexpr shallow() : len(0) { }
  };

template<typename T>
struct use_shallow
  {
   static constexpr shallow<T> s_zstr =3D { };
   static_assert(s_zstr.len =3D=3D 0);
  };

extern template struct shallow<char>;
extern template struct use_shallow<char>;

template struct shallow<char>;
template struct use_shallow<char>;
```

Constructor of `shallow` is lost. All GCC versions are affected.=