Bug#249691: gcc-3.4: false compiler error (templated base, templated child, private member)

[Philip Martin <philip@codematters.co.uk>]

> template <class T>
> class A
> {
>   protected:
>     int f;
> };
> 
> template <class T>
> class B: public A<T>
> {
>   public:
>     B()
>     {
> 	f = 1;   // line 14
>     }
> };
> 
> gcc-3.3 has no problem with this, but gcc-3.4 complains as follows:
> 
> a.cc: In constructor `B<T>::B()':
> a.cc:14: error: `f' undeclared (first use this function)
> a.cc:14: error: (Each undeclared identifier is reported only once for each function it appears in.)

This is an intended consequence of the new 3.4 C++ parser. From
http://gcc.gnu.org/gcc-3.4/changes.html

   "In a template definition, unqualified names will no longer find
    members of a dependent base"

You need to refer to "this->f" rather than the unqualified "f".

-- 
Philip Martin