Symbol versioning

[David Collier-Brown]

simo wrote:
> On Mon, 2008-05-26 at 17:10 +0200, Stefan (metze) Metzmacher wrote:
>>The things I would like to have are these:
>>
>>- Make it possible to use an old smbd with a newer winbindd
>>- Make it possible to use a new smbd against an older winbindd

A concrete suggestion: belt and suspenders.

Change the production makefiles to link to winbindd_whatever.so.1 (belt)

Create a winbindd_whatever.so.2, and build it with the new interfaces,
using symbol versioning in such a way that linkers that don't
understand get the new and and not the old versions. (suspenders) 

Change the Makefile for development version and optionally the 
winbindd_whatever.so symlink to point 
to winbindd_whatever.so.2 so that new builds get the new library.

Now experiment with new interfaces and versioning, knowing that
old builds won't trip over the new code.

--dave
-- 
David Collier-Brown            | Always do right. This will gratify
Sun Microsystems, Toronto      | some people and astonish the rest
davecb at sun.com                 |                      -- Mark Twain
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