ghc 8.2 does not build for me on ppc64le
[ 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