[GHC] #13259: cross-endian GHC generates invalid .hi files

[GHC]

#13259: cross-endian GHC generates invalid .hi files
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           Reporter:  slyfox         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           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:
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 I've reproduced the bug in the following setup:
 {{{
 ./configure \
     --enable-unregisterised \
     --host=x86_64-pc-linux-gnu \
     --target=m68k-unknown-linux-gnu
 }}}

 m68k is a 32-bit big-endian machine.

 {{{
 $ LD_BIND_NOW=1 inplace/bin/ghc-stage2 --show-iface libraries/base/dist-
 install/build/System/IO.hi
 Magic: Wanted 129742,
        got    3472490752
 magic number mismatch: old/corrupt interface file? (wanted 129742, got
 3472490752)

 $ printf "%08X - %08X\n" 129742 3472490752
 0001FACE - CEFA0100
 }}}

 Reverting changeset:fbcef83a3aa130d976a201f2a21c5afc5a43d000
 restores .hi loading and ghc-stage2.

 I'm still not sure what exactly breaks.

 WORDS_BIGENDIAN looks suspicious.

 I guess it breaks ghc-stage1 endianness understanding.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13259>
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