pack.deps in 6-2-branch

[Serge D. Mechveliani]

Dear GHC team,

To my report on  cvs ghc-6-2-branch

>>   Loading package foo ... linking ...
>>   /home/mechvel/t/u/lib/HSfoo.o: unknown symbol `__stginit_Prelude_'
>>   ghc-6.2.1: panic! (the `impossible' happened, GHC version 6.2.1):
>>         can't load package `foo'
>>   Please report it as a compiler bug to
>>   glasgow-haskell-bugs at haskell.org, or
>> http://sourceforge.net/projects/ghc/.
>>
>> [..]


Simon Marlow writes 

> I guess that was because the package might be 'base', in which case it
> really is a GHC bug.  Anyway I've changed that message so it doesn't
> claim to be a GHC bug any more.

All right.


>> 2. Indeed, the package  foo  should depend on the package  docon.
>>
>> So,  Makefile  has to set "foo" with the dependency on "docon".
>> And then the user invokes
>>                           ghci $pcpfoo
>> ,
>> and  docon  will be loaded automatically. Right?
>> But such Makefile does not work.
>>
>> If I set          package_deps = ["\"docon\""]
>>
>> to the  Makefile  part which creates the package description
>>
>>  pack = Package {name = "\"foo\"",
>>                  ...
>>                 }
>> ,
>> then     make foo
>> reports
>> ...
>>   Reading package info from stdin... done.
>>   Expanding embedded variables... done.
>>   dependency `docon' doesn't exist

> I don't know why that is; perhaps because you didn't include the
> package.conf containing the docon package (i.e. ghc-pkg -f
> my-package.conf).  
> Anyway, you can override that test using the --force 
> flag to ghc-pkg.
>


Thank you.
I changed now the corresponding lines in Makefile to
 
     pack = ..{
                package_deps = ["\"docon\""], \
              }

     echo $(pack) | $(ghcpkg)  -f $(doconc)  -f $(s)/foo.conf -u -g
 
where   doconc = /home/mechvel/docon/2.08/docon/source/docon.conf

Now `make' finds the dependencies. 
But 
(1) it is written in  User Guide Section 4.8.4  that the later `-f'
    override the previous ones in the  ghc-pkg  command line.

(2) After the above `make'	

    cd .../foo
    ghci -package-conf /home/mechvel/t/u/foo.conf -package foo

yields     ghc-6.2.1: unknown package name: docon .
And 
                ghci -package-conf $doconc -package docon
works correct.

Packages always was a pain.
Please, can you correct the above example with Makefile, with 
package  foo ?   

You have  docon-2.08-pre.  
Install it according to  install.txt  choosing "Non-optimized"
`make'.

And the project  foo  is attached to this letter as   foo.zip.

It has the two small Haskell modules and Makefile.
And it refers to the  docon  package.
Command
           mv foo.zip .../t
           cd t
           unzip foo.zip
           cd u
           make foo
           cd ..
           ghci -package-conf u/foo.conf -package foo

     "  ghc-6.2.1: unknown package name: docon  
     "

           ghci -package-conf $doconc -package docon
           ... 
           it works.

Is this a GHC bug?      
Please, can you correct this? 
GHC packages feature changes from version to version.
The general question is how work with DoCon by creating user packages.
So far, I do not know this and hence cannot explain this in DoCon 
manual. Need help with this.

With kind regards,

-----------------    
Serge Mechveliani
mechvel at botik.ru

             













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