[zeromq-dev] zproxy (hopefully) improvements

[AJ Lewis]

On Thu, Dec 05, 2013 at 11:23:40AM -0800, Stephen Hemminger wrote:
> On Thu, 5 Dec 2013 13:18:50 -0600
> AJ Lewis <aj.lewis at quantum.com> wrote:
> 
> > Absolutely - so if you build czmq against a newer version of zeromq, and
> > then drop that czmq build into an environment with an older version of
> > zeromq installed, what happens?  I think this fails spectacularly right now,
> > even before any of the changes discussed below.
> 
> Isn't this what shared library ABI versioning is for.
> At least on Linux, if you play by the rules it all works.

Unfortunately it doesn't help because the shared library API versioning is
only concerned with backwards incompatible changes - ie, changing existing
functions so that the original callers can't user them.  It doesn't cover
new functionality that is added - that can keep the same SONAME because old
binaries compiled against the old library continue to work.  There is an
implicit assumption that new binaries use the latest version of a library.

-- 
AJ Lewis
Software Engineer
Quantum Corporation

Work:    651 688-4346
email:   aj.lewis at quantum.com

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