[Gecode] gcc 3.4 build problems

[Guido Tack]

Hi all!

I've just installed gcc 3.4 on my machine, because Didier reported some 
problems he had using it to compile gecode. And indeed, it's just completely 
screwed :-(
It seems that they made some fundamental changes in the way they treat name 
lookup in inherited template classes. As a quick example, the following code 
doesn't work any more:

template <class T>
class Foo {
protected:
  int e;
};

template <class T>
class Bar : public Foo<T>
{
 public:
  void test() { e = e+1; }
};

>> error: `e' undeclared (first use this function)

You can fix it by prefixing every occurrence of e with Foo<T>. Now you can 
imagine that this is simply not feasible for Gecode, we're using this pattern 
in nearly every propagator that inherits from one of the generic templates.

I'm not sure if this is a bug or a feature, to me it definitely seems like a 
bug. If anyone has any suggestions, please let me know; otherwise I would 
suggest marking gcc 3.4 as not supported and hoping that this won't stay an 
issue in 4.0.

Btw: 3.4 did find some weird bugs that 3.3 overlooked, however ;-)

Guido

-- 
http://www.ps.uni-sb.de/~tack