On Thu, 29 May 2008, Robert Watson wrote:
On Thu, 29 May 2008, Andre Oppermann wrote:
These symbol versioning discussion come up from time to time and actually
as a developer who is not often confronted with it I have a hard time
figuring out what exactly I'm supposed to do here.
Hence my pretty-please request to the guru(s) in residence to write up a
section for the FreeBSD developers handbook explaining the concept of
symbol versioning, its concrete implementation in FreeBSD and the rules we
apply to versioning (including example cases like this and some earlier
ones that came up).
Daniel has a nice summary here:
http://people.freebsd.org/~deischen/symver/freebsd_versioning.txt
However, I agree that this is something I'd like to see moved into the
developers handbook, and as we get more experience, fleshed out. For
example, fts is one of the worked examples there, but I think the text could
talk a bit more about how a change in the layout of a structure, even though
function signatures remain the same, leads to an ABI change, and what other
implications there are.
I tried to do that with FILE, although it turns out it's not a good
example. I think we're basically screwed with structures unless we
add versioning inside them. An application can create a structure
using the new format from a recent libc, then pass it to a 3rd
party library that hasn't been rebuilt, and the 3rd party library
passes it back to libc using a compat function.
--
DE
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