[GHC] #13559: Remove LLVM/-fPIC check in DynFlags

[GHC]

#13559: Remove LLVM/-fPIC check in DynFlags
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
  (LLVM)                             |
           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:
-------------------------------------+-------------------------------------
 When the LLVM backend was first implemented the implementation did not
 support `-fPIC` or `-dynamic`. Support for this was added in
 60873542e8edf0ee593fde2b6544770d8036728f, which merely added the
 appropriate `-relocation-model` flag to the `opt` command line when
 compiling with `-fPIC`. However, the error message in
 `DynFlags.makeDynFlagsConsistent` remains for all but a select few
 platforms,
 {{{#!hs
  | hscTarget dflags == HscLlvm &&
    not ((arch == ArchX86_64) && (os == OSLinux || os == OSDarwin || os ==
 OSFreeBSD)) &&
    not ((isARM arch) && (os == OSLinux)) &&
    (gopt Opt_PIC dflags || WayDyn `elem` ways dflags)
     = if cGhcWithNativeCodeGen == "YES"
       then let dflags' = dflags { hscTarget = HscAsm }
                warn = "Using native code generator rather than LLVM, as
 LLVM is incompatible with -fPIC and -dynamic on this platform"
            in loop dflags' warn
       else throwGhcException $ CmdLineError "Can't use -fPIC or -dynamic
 on this platform"
 }}}

 Is this still necessary? If so, why? If not, we should remove it.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13559>
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