[GHC] #16001: hadrian doesn't support setting intree gmp configuration explicitly

[GHC]

#16001: hadrian doesn't support setting intree gmp configuration explicitly
-------------------------------------+-------------------------------------
        Reporter:  carter            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Build System      |              Version:  8.6.2
  (Hadrian)                          |
      Resolution:                    |             Keywords:
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 alpmestan):

 We could perhaps add a flag? We already have

 {{{
   --integer-simple            Build GHC with integer-simple library.
 }}}

 after all, where we're using integer-gmp (currently assuming system wide
 libgmp if I'm not mistaken?) as a default, when this flag is not given. We
 could instead perhaps have:

 {{{
   --integer-simple
   --system-gmp
   --in-tree-gmp
 }}}

 with `--system-gmp` being the default? The last two would imply the use of
 integer-gmp, of course.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16001#comment:4>
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