[GHC] #13824: ghc 8.2 does not build for me on ppc64le

[GHC]

#13824: ghc 8.2 does not build for me on ppc64le
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        Reporter:  msuchanek            |                Owner:  (none)
            Type:  bug                  |               Status:  new
        Priority:  normal               |            Milestone:
       Component:  Compiler             |              Version:  8.2.1-rc2
      Resolution:                       |             Keywords:
Operating System:  Linux                |         Architecture:  powerpc64
 Type of failure:  Building GHC failed  |            Test Case:
      Blocked By:                       |             Blocking:
 Related Tickets:                       |  Differential Rev(s):
       Wiki Page:                       |
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@@ -0,0 +1,1 @@
+ {{{
@@ -10,0 +11,1 @@
+ }}}

New description:

 {{{
 [ 5732s] ghc-stage1: panic! (the 'impossible' happened)
 [ 5732s]   (GHC version 8.2.0.20170613 for powerpc64le-unknown-linux):
 [ 5732s]        dwarfReturnRegNo: Unsupported platform!
 [ 5732s] CallStack (from HasCallStack):
 [ 5732s]   error, called at compiler/nativeGen/Dwarf/Constants.hs:225:19
 in ghc:Dwarf.Constants
 [ 5732s]
 [ 5732s] Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 }}}

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Comment (by bgamari):

 Thanks for your report.

 It looks like you are building with `-g3`, which isn't supported on
 PowerPC. Is this present in `mk/build.mk`?


 There are a few ways we could deal with this:

  1. Fail on unsupported platforms as we do now, perhaps with a nicer error
 message
  2. Silently ignore the flag
  3. Warn and ignore the flag

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13824#comment:1>
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