[GHC] #10320: -ddump-to-file should create empty dump files when there was nothing to dump

[GHC]

#10320: -ddump-to-file should create empty dump files when there was nothing to
dump
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        Reporter:  rwbarton          |                Owner:  tvv
            Type:  bug               |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.10.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1514
       Wiki Page:                    |
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Comment (by osa1):

 I tried to add a test for this, unfortunately as far as I can see this
 only happens when GHC panics(CoreLint errors may also trigger this, but I
 couldn't try this yet). Does anyone know a good way to add a test for
 this?

 In the meantime, can we revert this patch until someone comes up with a
 proper solution that works even when GHC panics?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10320#comment:9>
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