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List:       linux-newbie
Subject:    Re: Exporting symbols between modules
From:       Sergio Paracuellos <sparacuellos () lock-linux ! com>
Date:       2005-08-24 15:15:13
Message-ID: 1124896513.3260.1.camel () localhost ! localdomain
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El mié, 24-08-2005 a las 16:59 +0200, simon guinot escribió:
> hello
> 
> On Wed, 24 Aug 2005 09:28:08 +0200
> Sergio Paracuellos <sparacuellos@lock-linux.com> wrote:
> 
> > Hi all,
> > 
> > I'm new in this list and I have some problems exporting symbols in a
> > module to see them in other module.
> > 
> > In the module I want to export the symbol I do:
> > 
> > tList list;
> > EXPORT_SYMBOL(list);
> 
> ok... you've better to use the EXPORT_SYMBOL_NOVERS macro to export the symbol \
> whiteout the versioning information... don't forget to define EXPORT_SYMTAB before \
> include module.h... you can add a -DEXPORT_SYMTAB in your Makefile or a #define \
> EXPORT_SYMTAB before  #include <linux/module.h> in your source file...

Thanks, I solve it because it was a Makefile problem.

I was trying to compile two modules with different Makefiles. When I do
only one Makefile with

obj-m += module1
obj-m += module2

the problem dissapears.

Thanks to all.

Regards,

	Sergio
> 
> > 
> > I compile it and install without any problem.
> > 
> > And in the module I want to use them I declare list with "extern"
> > prototype:
> > 
> > extern tList list;
> > 
> > When I compile the module It says me that list is undefined, and I don't
> > know what I am doing wrong.
> 
> a compilation error or a loading error ?
> are you sure to have well defined the type tList in your "client" module ?
> may be a shareed header between your modules is missing :) 
> 
> regards
> 
> simon
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