[GHC] #11168: Cross build broken in commit 7af29da05d

[GHC]

#11168: Cross build broken in commit 7af29da05d
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Build System      |              Version:  7.11
      Resolution:                    |             Keywords:  cross-compile
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 Herbert Valerio Riedel <hvr@…>):

 In [changeset:"8b422142421c751d2c7fa7840afa61f923afdbe1/ghc" 8b42214/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8b422142421c751d2c7fa7840afa61f923afdbe1"
 Tweak use of AC_USE_SYSTEM_EXTENSIONS

 This makes sure that `AC_USE_SYSTEM_EXTENSIONS` (which
 implies `AC_PROG_CC`) is called after the
 `AC_ARG_WITH([cc],,)` invocation, so that the proper
 CC setting is in scope. Otherwise this can break cross-compilation.

 This also needs to pull in a submodule update for `unix`

 This is a follow-up commit to
 7af29da05d2e5a5e311a5f73f20d0f232035973b
 which hopefully fixes #11168
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11168#comment:6>
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