[Libreoffice] Reporting an error when loading of a component fails

[Lubos Lunak]

 Hello,

 last week .docx support was broken because of a mistake during the gbuild 
changes and I wasted quite some time finding out what was wrong. As something 
similar had happened to me already before I'd like to apply the attached 
patches. However I have some issues with it:

- the error dialog that pops up just says 'General error. General input/output 
error.', which is completely unhelpful, however I don't feel like digging 
more for how to pass the information as far as the place where the dialog is 
shown, so I'd like to add at least debug output

- the debug output in the patch is done just using fprintf(stderr), as I 
cannot find anything that would simply log a debug message and not do more - 
is there anything like that in LO?

- osl_loadModule*() functions are plain C functions from stable API, so no 
overloading to add the extra argument for the error message, the best I've 
come up with was simply a wrapper around dlerror(), which I admit is not very 
nice API either, would there be any better approach?

-- 
 Lubos Lunak
 l.lunak at suse.cz
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