[SDL] features -> build problems

[Enrico Weigelt]

Hi folks,


while building dosbox against sdl-1.2.9 I've noticed some 
conceptional problems with switchable features, which directly 
affect the API: things which normally belong into several 
libraries, ie. cdrom handling, are a part of libSDL.so and 
completely missing, if these features are disabled. It seems
there's no clean way for applications to test for these
features, and so linking may break with missing symbols.

For distro/integrator folks like me, this makes work quite
complicated. Feature dependencies are in general bad design, 
and if supplied features cannot be detected, it makes the
problem even worse.

To get out of this debacle, the cleanest way would be splitting
off libSDL.so into several libs - one for each feature / API part.

At least this should happen virtually - by supplying several 
.pc files / -config scripts, each representing an separate library,
but all pointing to the same .so.


cu
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