[openbeos] Re: ScreenSaver incompatability
- From: François Revol <revol@xxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Mon, 5 Apr 2004 14:32:58 +0200
Why not just have Screensavers and the lib export both symbols,
some being virtual, the others non-virtual (so we don't change
the vtable), and have the header list the correct ones ?
I think this has been told already.
François.
Selon Michael Phipps <mphipps1@xxxxxxxxxxxxxxxx>:
> Y'all remember how back in August/Sept of 2001 I said that we should shoot
> for binary compatibility and see what happens? Well, I have a minor issue.
> :-)
>
> This is sort of a continuation/explanation of what Francois was talking about
>
> a few weeks ago. It seems that when Be built the ScreenSaver preferences app,
>
> they linked against a header that had "ReservedScreenSaverX" members, where X
>
> varied from 1 to 8. libscreensaver.so was built against the header that ships
>
> with R5 that has "_ReservedScreenSaverX" members. Note the underscore.
>
> After a little testing, it seems that Be built their screensavers by linking
>
> to libscreensaver.so. All of theirs work with my code. Some developers did
> the same thing. Axel's very cool (according to my 8 year old) Nebula
> screensaver, for example, works just fine. But some (Matrix, for one)
> screensavers that did what the BeBook recommends and link against the
> ScreenSaver preferences app instead of libscreensaver.so will not work. They
>
> fail to load because there are missing symbols.
>
> So. I can go about this a couple of ways.
> 1) I can have one header. That would break certain screensavers, but would
> make a lot of build and use sense. It would correct the weirdness on a going
>
> forward basis. The downside is that some screensavers would break.
>
> 2) I can make a duplicate header that has no underscores and build my
> ScreenSaver prefs with it. That complicates our source tree but keeps
> everything working.
>
> So I have a request for all of you.
> Will you please look to see what screensaver you are running? If it is not a
>
> stock Be one (BuyNow, Flip, Icons, Lens, Lissart, Message, Spiral, Spots,
> StringTheme, SuperString, Blackness), will you find out where you got it from
>
> and see if source is available? If not (and you absolutely love it), let me
> know.
>
> If I don't get a flood of "save my Matrix" type emails, I will go with option
>
> 1. :-)
>
> Michael
>
>
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