[GHC] #16268: Potential race condition in Hadrian?

[GHC]

#16268: Potential race condition in Hadrian?
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 It seems that sometimes CI jobs fail because of a race condition in
 Hadrian.

 https://gitlab.haskell.org/ghc/ghc/-/jobs/20254

 Here, array finishes before `deepseq` starts to be built but the configure
 step for `deepseq` fails to find the library.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16268>
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