[vdr] Re: make plugins

[Marcel Wiesweg <marcel.wiesweg@gmx.de>]

Am Freitag, 11. Juli 2003 17:25 schrieb Gunnar Roth:
> >>is there a way to get an error about unresolved symbols when linking a
> >>plugin?
> >
> >Yes, there is. When the plugin is loaded, all functions in the dynamic
> > table of the plugin need to be resolved. If a function cannot be
> > resolved, VDR will terminate.
>
> But the question was, if there is a possibility to determine the
> unresolved symbol at linking time, NOT at run time.

ah... (but you can understand the other way, if "linking" means linking at run 
time ;-)  )

To the question: gcc does not (and must not) know into which executable the 
library will be loaded. However, there are two things you can do:
- link VDR's object files with the object files of the plugin (or the plugin 
library) and create a dummy executable. The linker will give the errors 
wanted.
- read the plugin's dynamic relocation table with
objdump -CT libvdr-myplugin.so | grep "UND" | less
and find symbols which should be defined in the plugin.

Marcel


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