[GHC] #13495: ghc-stage1: panic! (the 'impossible' happened) creating cross compiler for PPC

[GHC]

#13495: ghc-stage1: panic! (the 'impossible' happened) creating cross compiler for
PPC
--------------------------------+----------------------------------------
           Reporter:  jms       |             Owner:  (none)
               Type:  bug       |            Status:  new
           Priority:  normal    |         Milestone:
          Component:  Compiler  |           Version:  8.0.2
           Keywords:            |  Operating System:  Linux
       Architecture:  powerpc   |   Type of failure:  Building GHC failed
          Test Case:            |        Blocked By:
           Blocking:            |   Related Tickets:
Differential Rev(s):            |         Wiki Page:
--------------------------------+----------------------------------------
 We have a product based on a Freescale MPC8544E.

 I have previously built powerpc-unknown-linux-gnuspe-ghc-7.8.3 and that
 produces viable code though annoyingly rather large binaries but this is
 covered elsewhere.

 I looked at both 7.8.4 and 7.10 a while ago but they proved to be non-
 starters for reasons I no longer remember.

 Now for reasons tooling reasons (Stack and friends) it would be nice to
 use 8.0.2

 My procedure is as follows

 In the (ghc-7.83 or) ghc-8.0.2 source directory

 base=powerpc-unknown-linux-gnuspe; ./configure --prefix=/tmp/prefix
 --target=$base --with-gcc=$base-gcc --with-ld=$base-ld --with-nm=$base-nm
 --with-ar=$base-ar --with-ranlib=$base-ranlib --enable-unregisterised

 I edit mk/build.mk to make flavour "quick-cross"

 I edit ghc.mk and comment out anything with haskeline or terminfo

 The bottom of settings says ("Unregisterised", "YES"), ("LLVM llc
 command", "/usr/bin/llc-3.7"), ("LLVM opt command", "/usr/bin/opt-3.7")

 But the make itself (on Ubuntu 16 amd64) fails.

 "inplace/bin/ghc-stage1" -hisuf hi -osuf  o -hcsuf hc -static  -O0 -H64m
 -Wall      -this-unit-id ghc-prim-0.5.0.0 -hide-all-packages -i
 -ilibraries/ghc-prim/. -ilibraries/ghc-prim/dist-install/build -ilibraries
 /ghc-prim/dist-install/build/autogen -Ilibraries/ghc-prim/dist-
 install/build -Ilibraries/ghc-prim/dist-install/build/autogen -Ilibraries
 /ghc-prim/.    -optP-include -optPlibraries/ghc-prim/dist-
 install/build/autogen/cabal_macros.h -package-id rts -this-unit-id ghc-
 prim -XHaskell2010 -O -fllvm  -no-user-package-db -rtsopts -Wno-
 trustworthy-safe -Wno-deprecated-flags     -Wnoncanonical-monad-instances
 -odir libraries/ghc-prim/dist-install/build -hidir libraries/ghc-prim
 /dist-install/build -stubdir libraries/ghc-prim/dist-install/build    -c
 libraries/ghc-prim/./GHC/Types.hs -o libraries/ghc-prim/dist-
 install/build/GHC/Types.o
 ghc-stage1: panic! (the 'impossible' happened)
   (GHC version 8.0.2 for powerpc-unknown-linux):
         LlvmCodeGen.Ppr: Cross compiling without valid target info.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13495>
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