[GHC] #8974: 64 bit windows executable built with ghc-7.9.20140405+LLVM segfaults

[GHC]

#8974: 64 bit windows executable built with ghc-7.9.20140405+LLVM segfaults
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        Reporter:  awson            |                Owner:
            Type:  bug              |               Status:  new
        Priority:  high             |            Milestone:  8.0.1
       Component:  Compiler (LLVM)  |              Version:  7.9
      Resolution:                   |             Keywords:
Operating System:  Windows          |         Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash    |            Test Case:
      Blocked By:                   |             Blocking:
 Related Tickets:                   |  Differential Rev(s):
       Wiki Page:                   |
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Comment (by awson):

 Since I have now quite a bit of spare time, I've decided to look into
 this.

 Indeed, binutils `ld` is wrong here. I've created
 [https://sourceware.org/bugzilla/show_bug.cgi?id=17955#c1 the patch to
 binutils] which fixes things for me.

 OTOH, mention should be made that R_X86_64_PC64 reloc is '''not
 supported''' by MS in PE-COFF and neither MS `link` nor LLVM `lld` can
 handle it (the former simply ignores it and the latter complains about
 unsupported relocation type). Thus the proper way to fix it is to use a
 workaround similar to that used in NCG (see my comment above) to make LLVM
 generate R_X86_64_PC32 relocs instead.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8974#comment:40>
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