Rebuilding ghc changes interface hashes?
marlowsd at gmail.com
Tue Apr 5 21:51:52 CEST 2011
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), but there are some small elements of
randomness. I did manage to squash most causes of this, but a couple
there may be others that I don't know about.
I would really like to fix this, I'll think about whether we can make a
deterministic sort-order for bindings in Core, that would fix the CSE issue.
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