haddock-library-1.7.0 fails to build on ppc64 BE

I was trying to build ghc-8.6.2 for Fedora 28 and it failed on ppc64 (Bigendian) with:

utils/haddock/haddock-library/src/Documentation/Haddock/Types.hs:99:25: error:
    • GHC internal error: ‘TableRow’ is not in scope during type checking, but it passed the renamer
      tcl_env of environment: [aIy :-> Type variable ‘id’ = id :: k,
                               rHO :-> ATcTyCon Table :: k -> *,
                               rHP :-> APromotionErr RecDataConPE]
    • In the type ‘[TableRow id]’
      In the definition of data constructor ‘Table’
      In the data declaration for ‘Table’
   |
99 |   { tableHeaderRows :: [TableRow id]
   |                         ^^^^^^^^
utils/haddock/dist/build/haddock/autogen/Paths_haddock.hs:41:22: error:
    • Couldn't match type ‘a’ with ‘String’
      Expected type: IO a
        Actual type: IO String
    • In the first argument of ‘catchIO’, namely
        ‘(getEnv "haddock_libdir")’
      In the expression:
        catchIO (getEnv "haddock_libdir") (\ _ -> return libdir)
      In an equation for ‘getLibDir’:
          getLibDir
            = catchIO (getEnv "haddock_libdir") (\ _ -> return libdir)
   |
41 | getLibDir = catchIO (getEnv "haddock_libdir") (\_ -> return libdir)
   |                      ^^^^^^^^^^^^^^^^^^^^^^^
make[1]: *** [utils/haddock/ghc.mk:20: utils/haddock/dist/build/Documentation/Haddock/Types.dyn_o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: *** [utils/haddock/ghc.mk:20: utils/haddock/dist/build/Paths_haddock.dyn_o] Error 1
utils/haddock/haddock-api/src/Haddock/Syb.hs:22:1: warning: [-Wunused-top-binds]
    Defined but not used: ‘isType’
   |
22 | isType _ = isJust $ eqT @a @b
   | ^^^^^^
utils/haddock/haddock-api/src/Haddock/Syb.hs:38:1: warning: [-Wunused-top-binds]
    Defined but not used: ‘everythingBut’
   |
38 | everythingBut k f x = let (v, stop) = f x
   | ^^^^^^^^^^^^^
utils/haddock/haddock-api/src/Haddock/Syb.hs:60:21: warning: [-Wunused-matches]
    Defined but not used: ‘s’
   |
60 | everythingWithState s k f x =
   |                     ^
utils/haddock/haddock-api/src/Haddock/Syb.hs:75:1: warning: [-Wunused-top-binds]
    Defined but not used: ‘everywhereBut’
   |
75 | everywhereBut q f x
   | ^^^^^^^^^^^^^
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 8.6.2 for powerpc64-unknown-linux):
	urk! lookup local fingerprint
  $fShowTokenType
  []
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable
        pprPanic, called at compiler/iface/MkIface.hs:524:37 in ghc:MkIface
Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
make[1]: *** [utils/haddock/ghc.mk:20: utils/haddock/dist/build/Haddock/Backends/Hyperlinker/Types.dyn_o] Error 1
make: *** [Makefile:127: all] Error 2

https://koji.fedoraproject.org/koji/taskinfo?taskID=30919315 (the log files are only preserved for 2 weeks)

Trac metadata

Trac field	Value
Version	8.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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