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
case.
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
remain, see
http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance#Interfacestability
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.
Cheers,
Simon
http://hackage.haskell.org/trac/ghc/ticket/4012
Ciao,
Kili
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