python linking hack
jelmer at samba.org
Wed Oct 7 16:59:39 MDT 2009
On Wed, Oct 07, 2009 at 02:45:30PM +1100, tridge at samba.org wrote:
> > I've converted the build system to Python, have added tests for it and
> > have been doing some crazy refactoring. So far I've gotten the size of
> > bin/ down to 440 Mb and the overhead of the makefile generator is now
> > less than a second (down from 3 or 4 here locally) but there is still
> > more to be fixed.
> That's a little more of a radical than I expected :-)
Sorry :-) I've been pondering this for quite a while and your email
was the final drop that flooded the bucket (apologies if that proverb
doesn't translate well).
> In case it helps, I did a little more hackish work in my linking-wip
> branch, and got bin/ down to about 240M, most of which is
> bin/mergedobj/ and bin/shared/, which don't actually have to be
> included in Samba packages.
Thanks! I'll have a look.
> What basic linking approach are you thinking of adopting? I used a
> "one big shared lib" approach for my experiments, which works quite
> well I think, but it means the binaries need re-linking on install. Is
> that what you are looking at using?
I'm trying to avoid using a different approach for the local build as
for the installation as it makes things harder to debug, and it would
just mean I have the same problem to fix, but as Debian packager rather than
as Samba developer. :-)
I'm basically trying to put everything in multiple smaller libraries
rather than one big one. That's more work though, as it means we have
to eliminate cycles in the dependency graph.
> I think we also need to make sure we fix the other symptom of our poor
> linking, which is data being duplicated. The most obvious example of
> this is things like having DEBUGLEVEL appear more than once in a
> binary, so setting the debug level in one bit of C doesn't necessarily
> set it in another bit of C.
This is covered in my approach - the only instance of DEBUGLEVEL is in
I've also looked at making the build system stricter, basically
making it impossible (or perhaps just hard) to include the same object file
in multiple libraries as that's almost always wrong.
I might just steal your idea for the short term and then gradually
introduce more smaller libs.
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