[lttng-dev] Debian specific userspace RCU configure override

[Thibault, Daniel]

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Date: Wed, 28 May 2014 14:10:50 -0400

> As I currently understand, the debian build problem is that although the
> package is compiled on armv7 hardware, it is expected to target armv4t.
> And this is not correctly detected at configure-time.  The folks on
> #debian-arm suggested that this could be solved in configure.ac.  I can
> explicitly pass '--build <target>' to ./configure to get around this,
> but arm users that build from source will need to remember this.
>
> Jon
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   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?

Daniel U. Thibault
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