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Re: Rebuilding ghc changes interface hashes?

On 06/04/2011 12:40, Ian Lynagh wrote:
On Tue, Apr 05, 2011 at 08:51:52PM +0100, Simon Marlow wrote:
On 05/04/11 17:51, Matthias Kilian wrote:
On Tue, Apr 05, 2011 at 09:59:23PM +0530, Joachim Breitner wrote:
Also, the initial upload was built using ghc-6.12.1, while the upload
now is build with ghc-7.0.2. Given that it is a two-stage compiler, I
assume that the output should be identical, but it seems not to be the

Changing the bootstrapping compiler changes the ABIs. The same can
happen if you interrupt and restart the build.

In general changes can creep in randomly, there's no direct link
between changing the bootstrap compiler and getting different
compilation results (as far as I know)

compiler/stage2/build/Config.hs includes cBooterVersion, so if you boot
with a different version then you get different code =>  different ABI.

Oh, for the GHC package, yes. The complaint was that the hash for base changed though.

We could just remove this. In theory, stage2 won't be affected by the
bootstrapping compiler at all anyway.


Alternatively, if we make a config file (as we were discussing for
putting the paths to gcc and ar in) then it could go in there, and then
wouldn't be part of the ABI.

Ok, I suppose we could do that. I lean towards avoiding it if we can though (global state is bad, one more thing to go wrong, etc. etc.).


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