https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81764
Bug ID: 81764
Summary: Visibility for explicitly instantiated template class
get warned if it was implicitly instantiated
Product: gcc
Version: 7.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lanxingcan at gmail dot com
Target Milestone: ---
```cpp
template<typename ...> class g;
template<typename ...T>
class __attribute((visibility("default"))) g
{
g() = default;
static int f(int x)
{
return g<>::yyy::u(x); // g<> instantiated here
}
struct yyy
{
static int u(int x){
return x+ sizeof...(T);
}
};
};
extern template class __attribute((visibility("default"))) g<>;
template class g<>;
```
g++ says: extern-template.cc:23:60: warning: type attributes ignored after type
is already defined [-Wattributes]
extern template class __attribute((visibility("default"))) g<>;
Is this behaviour intended?
