Isaac Dupree wrote:
Simon Marlow wrote:
Note however that if you install this compiler, the packages in your home directory won't work any more, because they were compiled by another instance of 6.8.2
true, but doesn't 6.8.2 itself have the same ABI as any other 6.8.2, not counting packages?
Yes, the ABI is the same, but there's no guarantee that the interfaces to all the packages are the same.
against a different set of packages.
hmm. different versions? I think it might work out since I installed everything locally, if I just install the versions of the extra-libs that came with the 6.8.2 bindist...
Or do I have too great hopes in the reproducibility of ghc compilations?
It's too fragile to rely on getting the same results when you compile a package again, if -O is on. In practice, if the conditions are exactly the same you can often get identical interfaces, but we've never put any effort into figuring out how to guarantee this and under what conditions. Better not to rely on it. Cheers, Simon