[Bug c/21438] Warning about division by zero depends on lexical form

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21438

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
           Assignee|pinskia at gcc dot gnu.org         |unassigned at gcc dot 
gnu.org

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I am not going to fix this in the end. The reason is because the C++ front-end
warns twice for templates when I think it should only warn once.
```
template <int C>
int f2(int t)
{
        return t/0;
}

int tt1 = f2<0>(1);
```

Or none at all:
```
template <typename C>
int f(C t)
{
        return t/0;
}
template <int C>
int f1(int t)
{
        return t/C;
}

int tt = f<int>(1);
int tt1 = f1<0>(1);
```

Note clang warns twice for f2 but only once for f/f1.