[lttng-dev] Odd dependency for lttng-ust

[Mathieu Desnoyers]

* Thibault, Daniel (Daniel.Thibault at drdc-rddc.gc.ca) wrote:
> I'm starting from a clean Ubuntu 12.04 installation after adding the various prerequisites of the git.lttng.org LTTng 2 packages:
> 
> LTTng 2 Packages (in the proper dependency order):
> 
> lttng-modules (2.1.0+-c6403de)
> userspace-rcu (0.7.6-da9bed2)
> lttng-ust (2.1.0+-340f776)
> lttng-tools (2.1.1+-281047b)
> 
> Prerequisites installed:
> 
> automake
> binutils-gold
> bison
> flex
> libpopt-dev
> libtool
> libuuid1
> python-dev
> swig2.0
> kernel's headers (i.e. linux-headers-generic)
> texinfo
> g++
> 
> After making and installing lttng-modules and userspace-rcu successfully, lttng-ust's configure fails with:
> 
> checking for _cds_lfht_new in -lurcu-cds... no
> configure: error: Cannot find
> liburcu-cds lib, part of Userspace RCU 0.7 or better.
> 
> This occurs even though userspace-rcu installed
> /usr/local/lib/liburcu-cds.  It seems I must install liburcu-dev from
> the LTTng PPA (because the current Ubuntu liburcu-dev is 0.6.7 while
> lttng-ust requires 0.7 or better) before I can configure lttng-ust
> properly.  This is a weird bootstrapping problem: could the
> userspace-rcu package's install be incomplete?

Quoting the lttng-tools README file:

"    - liburcu
      Userspace RCU library, by Mathieu Desnoyers and Paul E. McKenney

      -> Tested with liburcu >= v0.7.2"

Therefore you need to install Userspace RCU 0.7.2 or later.

A dependency is not only on a package, but also on a range of versions.

Thanks,

Mathieu


> 
> Daniel U. Thibault
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Mathieu Desnoyers
EfficiOS Inc.
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