[lttng-dev] Odd dependency for lttng-ust

[Thibault, Daniel]

-----Message d'origine-----
De : Mathieu Desnoyers [mailto:mathieu.desnoyers at efficios.com] 
Envoyé : 21 janvier 2013 10:30

No. Distribution packages usually lag behind the project upstream.
Ubuntu 12.04 has been released last year, and their policy don't allow them to update the packages within this specific distribution version.

This is why you run into trouble when you try to mix distribution packages (from last year) with the current development head.

Don't mix packages from distributions with packages built from sources when version dependencies don't match. All the required dependency information is found in the README files of each project.

Mathieu
-----Fin du message d'origine-----

But I'm not mixing old packages with new: I tried fetching everything from git.lttng.org.  The README for lttng-ust reads in part:

PREREQUISITES:
  - liburcu
    Userspace RCU library, by Mathieu Desnoyers and Paul E. McKenney
    -> This release depends on liburcu v0.7.2
      * Debian/Ubuntu package: liburcu-dev
      * Website:  http://lttng.org/urcu
      * Releases: http://lttng.org/files/urcu
      * GitWeb:   http://lttng.org/cgi-bin/gitweb.cgi?p=userspace-rcu.git;a=summary
      * Git:      git://lttng.org/userspace-rcu.git

Doesn't this say that I can get the required liburcu from git.lttng.org's userspace-rcu?  Could it be version 0.7.6 is not retro-compatible with 0.7.2 (that is to say, lttng-ust requires 0.7.2, and 0.7.2 only, not "0.7.2 or later")?

Daniel U. Thibault
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