PATCH: Run V3 tests on installed compiler

[Benjamin Kosnik]

Apology accepted.

> Is it your position that you want 24 hours to review every change to 
> anything within the libstdc++-v3 subdirectory?  That's would be a unique 
> requirement, but if you and the other five V3 maintainers think it's 
> necessary, then I think that should be respected.  If you decide to do 
> that, would you please update http://gcc.gnu.org/cvswrite.html to 
> indicate that V3 has this rule?

No, I don't think an explicit rule is necessary. I'm against creeping
rule-itis. In general, giving people time to comment is a good thing,
however. I would ask you to allow us time to comment on future patches,
even without an explicit rule.

Please don't think that the test infrastructure is just some minor thing
that nobody cares about. 

-benjamin