[haiku-development] GCC 2 x GCC 4.

Now that we are able to have a dual system for running applications compiled with both GCC versions, I wonder if it would not be a good idea to compile Haiku with GCC 4 by default and provide the GCC 2 libraries. The reason being that this would be a clear signal to people that they should use GCC 4 from now on and considering we will have to do this at some point, now is probably a good time to do it.
We can even provide both tool chains and a way for developers to switch between the two if they wanted. WHat do you guys think? 

-Bruno
Ps: I have no idea if there are still problems related to the GCC 4 build so what I suggest may not be possible unless someone tracks whatever problem still exists down.

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