Compiling base with cabal fails.

[Lemmih]

Compiling base with -fext-core fails with ghc-6.10.1 and ghc-6.10.1rc.

Reproduce with: cd libraries/base/ && cabal build -v --ghc-options="-fext-core"

I've attached the output from my machine.

[Lemmih]

Output of 'cabal build -v --ghc-options="-fext-core"'

[Lemmih]

Turns out the same thing happens without the -fext-core flag.

[igloo]

This is also reproducible with

make rebuild.library.base

in libraries/ in a GHC build tree. (note: rebuild, rather than the normal remake. It uses Cabal to build, and thus ultimately ends up using ghc --make).

This did work at one point, but I don't know how long ago it broke.

[simonmar]

Still happens with HEAD today:

[ 66 of 170] Compiling Foreign.Ptr      ( Foreign/Ptr.hs, dist/build/Foreign/Ptr.o )
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 6.13.20100902 for x86_64-unknown-linux):
        tcIfaceGlobal (local): not found:
    base:GHC.Word.W#{d 6w}
    [(32R, Type constructor `base:GHC.Word.Word{tc 32R}'),
     (32U, Type constructor `base:GHC.Word.Word8{tc 32U}'),
     (32X, Type constructor `base:GHC.Word.Word16{tc 32X}'),
     (333, Type constructor `base:GHC.Word.Word32{tc 333}'),
     (339, Type constructor `base:GHC.Word.Word64{tc 339}'),
...

additionally, it's not possible to build base outside a GHC tree, because:

Preprocessing library base-4.3.0.0...
Building base-4.3.0.0...

GHC/Constants.hs:7:0:
     error: ../../../compiler/stage1/ghc_boot_platform.h: No such file or directory

GHC/Constants.hs:9:0:
     error: ../../../includes/HaskellConstants.hs: No such file or directory

It would be nice if it was possible to build base independently of GHC, for people trying to process base with the GHC API for exmple.

[igloo]

Test added in rename/should_compile/T3103.

[marlowsd@…]

commit f85c084c0d6e8f7ac8b282220eb93c69e356b5e1

Author: Simon Marlow <marlowsd@gmail.com>
Date:   Wed Nov 30 11:32:23 2011 +0000

    Include a stack trace in the panic message, when GHC is compiled profiled.
    
    I tried this out on the panic we're currently getting for #3103:
    
    ghc-stage2: panic! (the 'impossible' happened)
      (GHC version 7.3.20111128 for x86_64-unknown-linux):
            tcIfaceGlobal (local): not found:
        base:GHC.Word.W#{d 6w}
        [(32R, Type constructor `base:GHC.Word.Word{tc 32R}'),
         (r6O, Identifier `base:GHC.Word.$fNumWord{v r6O}'),
         (r6P, Identifier `base:GHC.Word.$fEqWord{v r6P}'),
         (r6Q, Identifier `base:GHC.Word.$fNumWord1{v r6Q}'),
         (r6R, Identifier `base:GHC.Word.$fNumWord2{v r6R}'),
         (r6S, Data constructor `base:GHC.Word.W#{d r6S}'),
         (r6U, Identifier `base:GHC.Word.W#{v r6U}'),
         (r75, Identifier `base:GHC.Word.$fNumWord_$csignum{v r75}'),
         (r76, Identifier `base:GHC.Word.$fEqWord_$c/={v r76}'),
         (r77, Identifier `base:GHC.Word.$fEqWord_$c=={v r77}')]
    { Main.main
       GHC.defaultErrorHandler
        GHC.runGhc
         GhcMonad.>>=
          GhcMonad.>>=.\
           Main.main'
            Main.doMake
             GhcMake.load
              GhcMake.load2
               GhcMake.upsweep
                GhcMake.upsweep.upsweep'
                 GhcMake.reTypecheckLoop
                  GhcMake.typecheckLoop
                   GhcMake.typecheckLoop.\
                    TcRnMonad.initIfaceCheck
                     TcRnMonad.initTcRnIf
                      IOEnv.runIOEnv
                       IOEnv.thenM
                        IOEnv.thenM.\
                         TcIface.typecheckIface
                          TcIface.typecheckIface.\
                           LoadIface.loadDecls
                            LoadIface.loadDecl
                             TcIface.tcIfaceDecl
                              TcIface.tc_iface_decl
                               TcIface.tcIdInfo
                                MonadUtils.foldlM
                                 TcIface.tcIdInfo.tcPrag
                                  TcIface.tcUnfolding
                                   TcIface.tcPragExpr
                                    TcIface.tcIfaceExpr
                                     TcIface.tcIfaceAlt
                                      TcIface.tcIfaceDataCon }

 compiler/utils/Panic.lhs |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

[simonpj]

This is a bug, but it's to do with wired-in things in the base package, and the base package is usually built with the GHC build system. So we'll punt this for now.

[monoidal]

Not sure if this matters, but when I do "cabal build" with HEAD only a warning is given instead of a panic:

[ 69 of 196] Compiling Foreign.Ptr      ( Foreign/Ptr.hs, dist/build/Foreign/Ptr.o )
The interface for `base:GHC.Num'
Declaration for $fNumWord_$csignum
Unfolding of GHC.Num.$fNumWord_$csignum:
  Can't find interface-file declaration for data constructor GHC.Types.W#
    Probable cause: bug in .hi-boot file, or inconsistent .hi file
    Use -ddump-if-trace to get an idea of which file caused the error

and the compilation succeeds. The warning is suspect, though.