[lttng-dev] Debian specific userspace RCU configure override

[Mathieu Desnoyers]

----- Original Message -----
> From: "Daniel Thibault" <Daniel.Thibault at drdc-rddc.gc.ca>
> To: "Mathieu Desnoyers" <mathieu.desnoyers at efficios.com>
> Cc: lttng-dev at lists.lttng.org, "Jon Bernard" <jbernard at debian.org>, "Ondřej Surý" <ondrej at sury.org>, "Michael
> Jeanson" <mjeanson at efficios.com>
> Sent: Thursday, June 5, 2014 2:15:20 PM
> Subject: RE: [lttng-dev] Debian specific userspace RCU configure override
> 
> -----Message d'origine-----
> De : Mathieu Desnoyers [mailto:mathieu.desnoyers at efficios.com]
> Envoyé : 5 juin 2014 13:55
> 
> >>    I need to revive this thread.  Although the original build failure may
> >>    have been on ARMv7 wanting ARMv4, I've run into the same failure with
> >>    a
> >>    pure ARMv7 architecture.  Specifically, Beagle Bone Black.
> >>
> >>    I built userspace-rcu without trouble (except for that clock business
> >>    reported earlier), but when I then tried to build lttng-ust, I ran
> >>    into
> >>    the same 'Error: selected processor does not support ARM mode `dmb'.
> >>    Taking a look at the userspace-rcu and lttng-ust config.logs, they
> >>    *both* report 'uname -m = armv7l'.  The core tests *both* report a
> >>    build system type of 'armv7l-unknown-linux-gnueabi'.  However,
> >>    userspace-rcu
> >>    tests for dmb and finds it, while lttng-ust omits this test.
> >>
> >>    The make error occurs during the CCLD of libringbuffer.la.
> >>
> >>    Besides the make, config and configure logs, what should I post here?
> >
> > You probably built lttng-ust against a mismatching version of urcu headers.
> >
> > Make sure you issue "make clean" in your lttng-ust tree, double-check that
> > the urcu/config.h header installed in your system (the one used by the
> > lttng-ust build) has the CONFIG_RCU_ARM_HAVE_DMB define in the correct
> > state (the one detected by urcu configure).
> >
> >Mathieu
> 
>    The system was clean and everything was first-run.  I did
>    bootstrap/configure/make/install for userspace-rcu, then the same for
>    lttng-ust (minus the install, of course).
> 
>    Both /usr/local/include/urcu/config.h and
>    /usr/src/userspace-rcu-0.8.0/urcu/config.h have '#define
>    CONFIG_RCU_ARM_HAVE_DMB 1'.  So does
>    /usr/src/userspace-rcu-0.8.0/config.h.  The only config.h *not* to have
>    that #define is /usr/src/lttng-ust-2.3.0/config.h.  Could it be the
>    libringbuffer make used the latter?

This define is specific to urcu config.h. It does not (and should not)
exist in UST config.h.

Thanks,

Mathieu

> 
> Daniel U. Thibault
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com