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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++/107906] linkage of template not taken into account
Date: Tue, 29 Nov 2022 08:57:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107906

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |4.1.2
            Summary|Function template           |linkage of template not
                   |specialization given weak   |taken into account
                   |rather than local symbol    |

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>specializations=20
That is not a specialization, that is an instantiation.

>So it's somehow a mistake of function templates.

It is not function templates which is causing the issue.  Rather than it is
template taking another template type which is causing issues.

E.g.
```
namespace {
  template<class>
  struct Y{};
}

template<template<class> class Q>=20
struct f{
  f(){__builtin_printf("Hello.\n");}
};
f<Y> z;
```
f<Y>'s ctor is emitted as a weak symbol.=