[GHC] #8834: 64-bit windows cabal.exe segfaults in GC

[GHC]

#8834: 64-bit windows cabal.exe segfaults in GC
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        Reporter:  awson         |            Owner:
            Type:  bug           |           Status:  patch
        Priority:  highest       |        Milestone:  7.8.1
       Component:  None          |          Version:  7.8.1-rc2
      Resolution:                |         Keywords:
Operating System:  Windows       |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Changes (by awson):

 * status:  new => patch


Comment:

 I've tested this reversal patch and all works fine.

 Moreover, it is not platform-specific, so it probably fix other weird
 segfaults on other platforms.

 That
 [https://github.com/ghc/ghc/commit/ad15c2b4bd37082ce989268b3d2f86a2cd34386a
 problematic commit] is particularly suspicious because if gets rid of
 `callerSaves` - the only explicitly platform-specific function used in
 `CmmSink.hs`. That looks very strange.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8834#comment:4>
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