[BUG] RTTI bug in GCC (<12.0)

[blueloveTH]

Description

The new py_cast<> in pkpy's main branch now uses RTTI features. However, some GCC versions won't compile due to a known bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103600

Step to reproduce

#include <typeinfo>

int main(){
    constexpr bool b = &typeid(int) == &typeid(long);
    return 0;
}

Error

error: '(((const std::type_info*)(& _ZTIi)) == ((const std::type_info*)(& _ZTIl)))' is not a constant expressionx86-64 gcc 10.3 #1

Solution

Fixed.