[GHC] #12627: build sytem feature request: persist warnings

[GHC]

#12627: build sytem feature request: persist warnings
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        Reporter:  nomeata           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         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 ezyang):

 Doesn't directly solve your problem, but https://github.com/ezyang/ghc-
 shake logs warnings to persistent files so that you can view them later.
 They get stored in `*.log` files, so you can print them all out with `find
 dist -name "*.log" -exec cat {} \;` or something like that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12627#comment:1>
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