[Libevent-users] [PATCH] Add autoconf/make functionality for --disable-dns, --disable-http, and --disable-bevents

[Nick Mathewson]

On Sat, Oct 20, 2007 at 10:22:27AM -0700, Niels Provos wrote:
> After talking with Nick, I think the solution that makes the most
> sense is to build three different libraries:
> 
>   - libevent-core which contains only the event loop
>   - libevent-extras which contains DNS, HTTP, etc.
>   - libevent which contains everything for backwards compatibility
> 
> That should make everyone happy.

Okay!  I'll do this in trunk in the next couple of days, assuming that
nobody objects.

Another issue: We're apparently using the --revision and --version
arguments to libtool wrong.  Our use of --revision means that binaries
built against one version of libevent need to be rebuilt to use the
next.  Our current non-use f --version-info means that once we fix the
--revision problem, we'll give linkers the wrong idea about which
versions of libevent are which.

What we need to do in order to use --version-info correctly is
described here:
http://sourceware.org/autobook/autobook/autobook_91.html 

Is this something that we're willing to do?  If I understand the
documentation correctly, then practice, we'd have to keep 3 numbers:
"Current", "Revision", and "Age".  We'd need to note, whenever we do a
new release: whether it adds new interfaces, and whether it breaks
binary compatibility, and then, by cases:
   if (the interface changed) {
        if (binary compatibility isn't broken)
           increment "age";
        Increment "current", set "revision" to 0.
   } else {
        increment "revision";
   }

It's a little more bookkeeping, but I believe it would make us play
better with linkers and applications.  For more background, see the
thread "Question: Library Naming."

yrs,
-- 
Nick Mathewson
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