[GHC] #11537: GHC fails to compile if source is in /ghc

[GHC]

#11537: GHC fails to compile if source is in /ghc
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           Reporter:  wereHamster    |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I was building GHC in a docker image and was ignorant what the $PWD is (it
 is / in case you were wondering). So I cloned GHC into /ghc, and attempted
 to build it from there.

 Eventually the build fails because there is a sed expression
 `'s|$(TOP)/|...'` which rewrites some include paths to nonesense:
 /usr/lib/ghc/include/... -> /usr/libinclude/...

 Anchoring the expression (`'s|^$(TOP)/|...'`) helped the build process to
 continue past that point, but I haven't completed it due to other issue,
 so there may be other places where $(TOP) == /ghc breaks the build.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11537>
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