panic! ... forkM Declaration for tables{v}

[nobody]

Got this while trying to build the examples code in 
HSsql. I am obviously having problems with locations of 
interface files. 

The complete verbage is:

Mark@mark-
xsd45hrekw /dosC/Software/haskell/hsql14_src/HSQL/e
xamples
$ ghc -package hsql Queries.hs
c:/Software/haskell/ghc-
6.4.0/imports/Database/HSQL.hi :
  Can't find interface-file declaration for 
Database.HSQL.Types.Connection
    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
ghc.exe: panic! (the `impossible' happened, GHC 
version 6.4):
        forkM Declaration for tables{v}

Please report it as a compiler bug to glasgow-haskell-
bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.

mwassell@bigpond.net.au

[wferi]

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I've got similar output when trying to compile WashNGo 2.3.1:

$ ghc -package WASH --make Main -F -pgmF
/home/wferi/wash/bin/wash2hs
Chasing modules from: Main
Compiling Main             ( Main.hs, Main.o )
/home/wferi/wash/lib/WASH-CGI-1.4.37/ghc-6-4/import/CGIInternals.hi
:
  Could not find module `HTMLMonadBase':
    it is not a module in the current program, or in any
known package.
ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
        forkM Declaration for ask{v}

Please report it as a compiler bug to
glasgow-haskell-bugs@haskell.org,
or http://sourceforge.net/projects/ghc/.

I experience this under FreeBSD with GHC compiled from ports.

[simonpj]

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Can someone give complete instructions for how to reproduce 
this bug?  E.g. I'm busy compiling WASH, but it looks as if 
you have to install it and compile something else too...

Step by step repro instructions would be v helpful.

Simon

[wferi]

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OK, let me try.  First of all I applied the attached patch, then
./configure --prefix=/home/wferi/wash
make depend
make all
make install
which bailed out when tried to update the system
package.conf since I wasn't root.  Nevermind, Wash isn't
compatible with GHC 6.4 anyways, so I hacked together a user
package.conf via ghc_pkg (attached).
Then I typed in the first example from the Wash manual
(attached) and tried to compile it.  I couldn't find a trace
of extra_ghc_opts or similar, so had to provide those
options on the command line.  Hope I didn't forget anything.
 FreeBSD 5.3-STABLE, btw.

[wferi]

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Bummer, how do you attach files to this page? Find my
references at
http://tac.ki.iif.hu/attach.tgz instead.

[simonpj]

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Feric, I tried following your recipe, but the package.conf you 
sent didn't have any modules at all in the hidden/exposed 
modules list.  

So I still can't reproduce this.  Indeed, I'm not sure how either 
you or mwassell are getting as far as you are, given that 
neither HSQL nor Wash have package.conf stuff that is 
compatible with GHC 6.4  

Can you fix Wash so that it does use GHC 6.4 package.conf 
files?  Or give me some other way to reproduce it?

Simon

[wferi]

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Hi Simon,

I agree that the attached package.conf doesn't make much
sense.  Still, I can cook from my own recipe, just tried
like this:

$ mkdir retry
$ cd retry
$ wget http://tac.ki.iif.hu/attach.tgz
$ tar -xzf attach.tgz
$ tar -xzf ../WashNGo-2.3.1.tgz
$ patch <attach/wash64.patch
$ cd WashNGo-2.3.1
$ ./configure --prefix=/home/wferi/retry/wash
$ gmake depend
$ gmake all && gmake install
[...]
ghc-pkg: /usr/local/lib/ghc-6.4/package.conf: you don't have
permission to modify this file
gmake[2]: *** [install-dumb-package] Error 1
gmake[2]: Leaving directory
`/home/wferi/retry/WashNGo-2.3.1/cgi'
gmake[1]: *** [subdirs] Error 2
gmake[1]: Leaving directory `/home/wferi/retry/WashNGo-2.3.1'
gmake: *** [install] Error 2
$ cd ../attach
$ ghc -package-conf package.conf -package WASH --make Main
-F -pgmF /home/wferi/retry/wash/bin/wash2hs

and the `impossible' happens.  Fixing Wash is slightly
beyond my understanding, eg. ghc-options is documented on
the Cabal page but isn't present in package.conf, how comes?

Regards,
Feri.

[simonpj]

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I still can't reproduce this. When I get to the 'make install' 
step I get

.././GenPKG/GenPKG Utility --
import_dirs /home/simonpj/tmp/wash/lib/Utility-0.3.11/ghc-6-
4/import --library_dirs /home/simonpj/tmp/wash/lib/Utility-
0.3.11/ghc-6-4 --hs_libraries Utility --package_deps text 
| /home/simonmar/fp/bin/i386-unknown-linux/ghc-pkg  --
update-package --auto-ghci-libs
Reading package info from stdin... ghc-pkg: Line 1: Invalid 
syntax (no colon after field name)
make[2]: *** [install] Error 1


====

Then if I try your next step, to run WASH, I get the 'cant find 
module' complaint, for the same reason as before: your 
package.conf file has no exposed modules.

I can't see how this can possibly work. Until I can reproduce 
it, I'm stuck.


cam-02-unx:~/tmp/attach$ ghc -package-conf package.conf -
package WASH --make Main -pgmF 
~/tmp/wash/bin/wash2hs 
Chasing modules from: Main
Could not find module `CGI':
  use -v to see a list of the files searched for
  (imported from Main.hs)
cam-02-unx:~/tmp/attach$ 

[wferi]

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Well, my package.conf does have exposed modules:

attach$ ghc-pkg --package-conf package.conf describe
WASH-CGI | grep exposed
exposed: True
exposed-modules: CGI CGIInternals Fields

But your ghc-pkg gives a very different error message to
that of mine.  Wild guess: isn't it possible that it
registers some empty packages which override the ones from
my package.conf?

attach$ ghc-pkg --package-conf package.conf list
$ ghc-pkg --package-conf package.conf list
/usr/local/lib/ghc-6.4/package.conf:
    rts-1.0, base-1.0, haskell98-1.0, template-haskell-1.0,
unix-1.0,
    Cabal-1.0, parsec-1.0, haskell-src-1.0, network-1.0,
    QuickCheck-1.0, HUnit-1.1, mtl-1.0, fgl-5.2, OpenGL-2.0,
stm-1.0,
    readline-1.0, (lang-1.0), (concurrent-1.0), (posix-1.0),
    (util-1.0), (data-1.0), (text-1.0), (net-1.0),
(hssource-1.0)
/home/wferi/.ghc/i386-freebsd-6.4/package.conf:
package.conf:
    (Utility), (WASHHTML), (WASHMail), (WASH), WASH-CGI

here.  I'm absolutely new to this package business, so if
you can think of any (possibly trivial) reason for this
discrepancy, don't hesitate to ask for the info needed.

[simonmar]

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At least in the WASH case, this turns out to be because you
missed out some modules from the package description.  The
package description should contain all the modules of the
package, either in the exposed-modules or hidden-modules field.

The error message is rather unhelpful - we'll try to improve it.

I'm hoping this expalanation applies to the HSQL example too
- if not, please shout and we can re-open the bug.

[wferi]

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Just to make sure: the "Could not find module
`HTMLMonadBase'..." is entirely reasonable (and my
package.conf is crap), it's the "ghc: panic!" I found worrying.

Anyway.  Let me drift off topic: why no ghcOptions field in
package.conf?  I'd perhaps try porting Wash if it were
present...

[mwassell@…]

Sorry for the late reply. wferi's comment applies to me as well - the message about not finding the interface file is reasonable and clear - it is the panic that I was reporting (as requested at the end of the message).