[GHC] #15891: Excessive system time during execution of GHC-built executables on macOS

[GHC]

#15891: Excessive system time during execution of GHC-built executables on macOS
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        Reporter:  goldfire      |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:  8.6.3
       Component:  Compiler      |              Version:  8.6.2
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by gridaphobe):

 Ah, I just noticed there's a separate `CC_STAGE0` flag that controls the
 bootstrapping C compiler. I rebuilt GHC with gcc as the bootstrapping C
 compiler, but it didn't seem to change anything.

 I did manage to collect a sample of ghc-stage1 this time though.

 https://gist.github.com/gridaphobe/2ce36816c41568b4317173d016dc73c0

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15891#comment:7>
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