[PATCH v2 libevdev 13/13] Add ld version-script

[Peter Hutterer]

On Mon, Aug 26, 2013 at 09:27:33AM +1000, Peter Hutterer wrote:
> From: David Herrmann <dh.herrmann at gmail.com>
> 
> Explicit symbol versioning allows us to provide multiple versions of
> incompatible API changes. It is a very common practice in GNU world and
> avoids the problems occuring if distributions try to ship multiple version
> of a single DSO.
> 
> We currently don't have any incompatibilities, but we need to start
> versioning right from the beginning to allow for smooth transitions later.
> 
> Background information available at:
>   http://people.redhat.com/drepper/dsohowto.pdf
> 
> To see the symbol-versions, use objdump:
>   objdump -T libevdev/.libs/libevdev.so.1.0.0
> This can also be used to verify that all 67 symbols are correctly
> exported (typos in linker-scripts are silently ignored by ld).
> 
> Note that we cannot mix linker-scripts with -export-* commands so we
> explicitly have to mark all symbols as visibility=public via EXPORT.
> 
> Signed-off-by: David Herrmann <dh.herrmann at gmail.com>
> Reviewed-by: Peter Hutterer <peter.hutterer at who-t.net>
> Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>

I ended up pushing this only partially. The LIBEVDEV_EXPORT bits are in, but
the linker versioning part of it isn't. I'll hold off that, mainly because
the API is a bit in flux (I've got more changes coming).

I'll merge the rest once we're ready to commit to an API, from then on we
can do proper versioning.

Cheers,
   Peter