On Thu, 2012-04-05 at 20:21 +0200, drago01 wrote: > On Thu, Apr 5, 2012 at 8:03 PM, Richard W.M. Jones <rjo...@redhat.com> wrote: > > Today when using F17 Alpha, I ran qemu and got an error which was > > something like: > > > > qemu-kvm: undefined symbol usbredirhost_foo > > > > (I don't recall the precise symbol). This was just because that > > version of qemu was compiled against a later version of > > libusbredirhost.so (but one with the same soname), and updating > > libusbredirhost.so fixed the problem. > > > > The 'qemu' package has a bug, of sorts: the maintainer should have > > added a specific Requires line: > > > > Requires: usbredir >= <some version> > > > > However, instead of pushing this problem on packagers, maybe RPM > > should resolve this by encoding the (admittedly long) list of symbols > > used by a binary? > > Well the bug here is that usbredir changed ABI without bumping the soname.
This isn't a backwards-incompatible change, as I understand it. It looks like they added a feature to the ABI and qemu started relying on it. So it really is just a case of the qemu package not properly identifying its dependency. A library only needs to bump it's soname if it changes or removes a public function. Adding a new one is generally fine.
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