[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
-------------------------------------+-------------------------------------
        Reporter:  kili              |                   Owner:  Fuuzetsu
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.12.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by simonpj):

 * priority:  normal => high


Comment:

 George Colpitts asks: the milestone is 7.12.1, should it be 7.10.2?

 It would be unusual to delay a patch-level release for a ticket that has
 been open for five years.

 Doing so would mean indefinitely delaying 7.10.2.  By “indefinite” I don't
 mean "forever", I just mean “we don’t know how long”:
  * We don’t have anyone owning the ticket,
  * we don’t know how difficult it is to fix; and
  * a full bulletproof fix is probably quite challenging  (e.g. forcing the
 unique-supply generator to give reproducible results even though some
 (ultimately irrelevant) bits of the environment have changes, would be
 difficult)

 At the same time we have some folk urging us to get 7.10.2 out sooner
 rather than later.

 So everyone:
  * If you think we should delay 7.10.2 pending at least some progress on
 this, please say so on the ticket.
  * Better still, roll up your sleeves and take a crack at understanding
 more precisely what is going on, and proposing a fix.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:83>
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