[GHC] #8717: Segfault in 64-bit Windows GHCi

[GHC]

#8717: Segfault in 64-bit Windows GHCi
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        Reporter:  awson       |            Owner:
            Type:  bug         |           Status:  new
        Priority:  normal      |        Milestone:  7.8.1
       Component:  GHCi        |          Version:  7.8.1-rc1
      Resolution:              |         Keywords:
Operating System:  Windows     |     Architecture:  x86_64 (amd64)
 Type of failure:  GHCi crash  |       Difficulty:  Difficult (2-5 days)
       Test Case:              |       Blocked By:
        Blocking:              |  Related Tickets:
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Comment (by awson):

 Phew. That was a nightmarish debugging experience.

 At last, I've found that some code in {{{base}}} wants to access
 {{{GetCommandLineW}}} not at an exact trampolined address but with
 {{{+1}}} offset.

 I am extremely tired, so I've decided to not dig further in {{{GHCi}}}
 with {{{base}}} interaction and simply exposed {{{GetCommandLineW}}} to
 {{{GHCi}}} statically. Thus, {{{GetCommandLineW}}} is loaded by a system
 linker and is not trampolined anymore.

 This is ugly hack, but it works and makes {{{GHC}}} build, for example,
 {{{llvm-general}}} package - impossible thing before.

 This patch applies to 7.8 and HEAD.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8717#comment:1>
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