[GHC] #13356: gmp/ghc.mk's use of TARGETPLATFORM and BUILDPLATFORM is wrong

[GHC]

#13356: gmp/ghc.mk's use of TARGETPLATFORM and BUILDPLATFORM is wrong
-------------------------------------+-------------------------------------
           Reporter:  rwbarton       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 `libraries/integer-gmp/gmp/ghc.mk` invokes `libgmp`'s configure script
 with the options
 {{{
 --host=$(TARGETPLATFORM) --build=$(BUILDPLATFORM)
 }}}
 Using `TARGETPLATFORM` is wrong, as it is the GHC-munged target triple.
 For example if the triple passed to the top-level configure script was
 `--target=aarch64-apple-darwin14` (for iPhone), `TARGETPLATFORM` will be
 `aarch64-apple-ios`, which `configure` does not understand.

 Instead of `TARGETPLATFORM` we should use `TargetPlatformFull`. I don't
 think we have a corresponding variable for `BUILDPLATFORM`, so we should
 add one if it's important.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13356>
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