[GHC] #9924: libffi configure script does not detect MSYS2 Windows 10 x86_64

[GHC]

#9924: libffi configure script does not detect MSYS2 Windows 10 x86_64
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              Reporter:  luite       |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.10.1-rc1
            Resolution:              |         Keywords:
      Operating System:  Windows     |     Architecture:  Unknown/Multiple
       Type of failure:              |       Difficulty:  Unknown
  None/Unknown                       |       Blocked By:
             Test Case:              |  Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Comment (by luite):

 Yep, I just completed a build succesfully with the following patch:

 {{{
 diff --git a/libffi/ghc.mk b/libffi/ghc.mk
 index ec37f0c..62ffe32 100644
 --- a/libffi/ghc.mk
 +++ b/libffi/ghc.mk
 @@ -89,6 +89,8 @@ $(libffi_STAMP_CONFIGURE): $(TOUCH_DEP)
         cd libffi && \
             $(LIBFFI_PATH_MANGLE) \
             cd build && \
 +            cp $(TOP)/config.guess config.guess && \
 +            cp $(TOP)/config.sub config.sub && \
             CC=$(CC_STAGE1) \
             CXX=$(CC_STAGE1) \
             LD=$(LD) \
 }}}

 (This probably fails if `$(TOP)` contains spaces, due to missing quotes)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9924#comment:3>
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