[GHC] #10090: Building ghc with "make -j12" gives different ABI hashes for base to "make -j8"

[GHC]

#10090: Building ghc with "make -j12" gives different ABI hashes for base to "make
-j8"
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        Reporter:  juhpetersen       |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Build System      |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #9370             |                Blocking:
                                     |  Differential Revisions:
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Changes (by int-e):

 * related:   => #9370


Comment:

 I could reproduce this with ghc-7.8.4 (for example, I obtained 3 different
 ABI hashes for the haskell98 package from building ghc 6 times, with -j1,
 -j4, -j8, -j12, -j16 and -j24).

 On the other hand, ghc-7.10 RC2 produced identical ABI hashes in the same
 scenario. So this appears to have been fixed, at least for the libraries
 in ghc.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10090#comment:2>
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