[GHC] #10705: make configure warn when ghc-tarballs is missing on windows and provide guidance to download it.

[GHC]

#10705: make configure warn when ghc-tarballs is missing on windows and provide
guidance to download it.
-------------------------------------+-------------------------------------
        Reporter:  Phyx-             |                   Owner:
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  FreeBSD           |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #9218             |  Differential Revisions:  Phab:D1108
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Comment (by Phyx-):

 Replying to [comment:6 pgj]:
 > However, the `function` keyword was not needed for that.  Removing them
 from `configure.ac` fixes the problem for me.

 Yes it seems that function is a non-POSIX extension in bash:


 > When using the 'function' keyword, Bash function declarations are not
 compatible with Bourne/Korn/POSIX scripts (the Korn shell has the same
 problem when using 'function'), but Bash accepts the same function
 declaration syntax as the Bourne and Korn shells, and is POSIX-conformant


 Was not aware of that. Sorry bout that. Removing the keyword is the right
 fix. I'll be able to send a new diff in about 6 hours. Unless someone else
 wants to fix it before then.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10705#comment:7>
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