Re: ghc-cvs-snapshot with wxHaskell

[Georg Martius]

Hi,

Patrick and I found some answers to the questions/problems we encountered.
Finally got the thing to work. (patches appended)
Versions: ghc-6.4.20050215
            wxHaskell-0.8.

1. dep-files

the new ghc produces a different dependency file. It includes also dependencies for imported modules. i.e.

module A import B

it generates:

B.o : B.hs
A.o : A.hs
A.o : B.hi

where as the old ghc omitted the first line, which is not necessary IMO.
The problem with the wx-Makefile is now that the .o and .hi files should reside 
in another directory namely out/...
The current approach is to use "sed". However on the new depfiles it generates 
rules, which are not correct and which lead to the problems Patrick experiences.
I have a possible fix:
    add -odir out/... to the call of ghc -M. This produces correct paths for 
the .o files.
    use "grep" to filter module A
        Problem: the .hi files have still the source path.
        Question @Daan: Why do they have to by in out/...? It seams to 
complicate the thing.
        Solution: "sed"
 I fixed that in "makefile.lib".

 Now the dependency stuff seams to work fine. No double compilation anymore.

2. correct import-search path
the make file calls ghc from the wxHaskell-root. Therefore -icurrent/source/path has to 
be included. I fixed that in "makefile".

3. Package stuff
I included package files in the new style to the configure script.
Problem: the environment variable are not substituted any longer by ghc-pkg ?
My hack: let configure sustitude the variable, i.e.
configure:750

wxhlibdir="${libdir}"

.
.

import-dirs: ${wxhlibdir}/imports

instead of

import-dirs: \${wxhlibdir}/imports

This might cause problems with the rpm install stuff.

Additionally, I had problems with the license field. It seams to be a choice 
rather a text-field. I took BSD3 since it worked.
@Simon: How can I add a custom license like "wxWindows"
@Daan: Please complete the package files. There are a couple of new entries. 
Also some exports from wxcore might be better in the hidden-modules field. 
Honestly I have no idea where it is for.
A had to add a

extra-libs : wxc-gtk2.4.2-0.8

to wxcore package info. This seams not quite portable :-).
@Daan: please replace this by a proper variable

4. Module name clash
ghc complained:
wxdirect/src/Set.hs:1:0:
    Module `Set' is a member of package data-1.0.
    To compile this module, please use -ignore-package data-1.0.

I love ghc's error messages! Great job Simon!

@Daan: the configure script uses /usr as a default prefix. I think /usr/local is more 
standard here. Additionally the modules are installed to <prefix>/lib/imports. I 
would rather like <prefix>/lib/wxHaskell/imports.
How do we make sure that nobody else wants to use the path lib/imports?
This is a fairly common, or at least non-specific, directory name in my eyes.

Cheers,
 Georg

On Thu, 17 Feb 2005 00:44:23 +0100, Patrick Scheibe <[EMAIL PROTECTED]> wrote:

On Wednesday 16 February 2005 16:48, you wrote:

Hi Simon and Daan.

I took the stable ghc source from yesterday, 15th of february.
I think Simon fixed the creation of .depfiles problem, am I right?
Touching of these files is unnecessary now.

In earlier versions the ghc seems to make the right thing when you call
ghc -M ./dir1/dir2/src/Moduldir/Modul.hs

Now there are errors when you call it from outside the modulpath:
> Could not find module `ParseEiffel':
>   use -v to see a list of the files searched for
>   (imported from wxdirect/src/CompileDefs.hs)

I fixed this with giving the -i./dir1/dir2/src option to every call.
@Simon: is this a feature? Do I make something strange with this fix?

Now the compilation runs fine (:-) but when I do a make install, the
makefile begins to compile again!?? After a while of compilation it breaks
with a "no rule to make.." error. How can ghc forget the compiled stuff?
The objects are definitely there, so there is no need to recompile WX.o,
...

@Daan: I tried to delete the dependency wx from the install rule of the
makefile but that
doesn't matter. I would like to install it by myself to see if the lib is
working. Do you have a quick bad fix of this?

Cheers
Patrick

--

---- Georg Martius,  Tel: (+49 34297) 89434 ----
------- http://www.flexman.homeip.net ---------

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