<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/87235>87235</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang rejects valid out of class definition of a static const data member as constexpr
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          ranaanoop
      </td>
    </tr>
</table>

<pre>
    Consider the following program and the comments given in there:

```
template<class T>  
class C
{ 
    public:
 static const double mem;   
         static const int    k; 
};

template<class T> 
constexpr double C<T>::mem{}; 

template<class T> 
constexpr int C<T>::k{}; 
int main()
{
    constexpr double i  = C<double>::mem; //#1: gcc accepts but both clang and msvc rejcects
    constexpr int    j  = C<double>::k; //#2: gcc and clang accepts but msvc rejects
} 
```
As you can see clang accepts `2`([demo](https://godbolt.org/z/68xdvGrex)) but rejects `#1`([demo](https://godbolt.org/z/KvTfKzrMe))
</pre>
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