[GHC] #12554: Testsuite exhibits large amount of framework failures

[GHC]

#12554: Testsuite exhibits large amount of framework failures
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        Reporter:  Phyx-             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Test Suite        |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"9cb4459893c1c56553b413786cea3171b4e665ca/ghc"
 9cb44598/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9cb4459893c1c56553b413786cea3171b4e665ca"
 testsuite: Work around #12554

 It seems that Python 2.7.11 and "recent" msys2 releases are broken,
 holding open file locks unexpected. This causes rmtree to intermittently
 fail. Even worse, it would fail silently (since we pass
 ignore_errors=True), causing makedirs to fail later.

 We now explicitly check for the existence of the test directory before
 attempting to delete it and disable ignore_errors. Moreover, on Windows
 we now try multiple times to rmtree the testdir, working around the
 apparently msys bug.

 This is all just terrible, but Phyx and I spent several hours trying to
 track down the issue to no available. The workaround is better than
 nothing.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12554#comment:26>
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