[lttng-dev] lttng-modules 2.6.1 compilation error on Ubuntu 14.04

[Mathieu Desnoyers]

----- Original Message -----
> ----- Original Message -----
> 
> > Hello there. I was wondering if anybody knew what is causing this
> > compilation
> > error I'm getting on a new Ubuntu 14.04 VM with a 3.13.0 kernel. It does
> > not
> > find the DEBIAN_API_VERSION symbol. The use of that was introduced in 2.6.1
> > apparently:
> 
> > http://fossies.org/diffs/lttng-modules/2.6.0_vs_2.6.1/lttng-kernel-version.h-diff.html
> 
> > I'm following the instructions in the Download page to install from the PPA
> > :
> > http://lttng.org/download/#ubuntu
> 
> > This the error I'm getting. Thanks in advance for any help!
> 
> > In file included from
> > /var/lib/dkms/lttng-modules/2.6.x+stable+bzr727+pack22+201504291801~ubuntu14.04.1/build/wrapper/page_alloc.h:28:0,
> > 	from
> > /var/lib/dkms/lttng-modules/2.6.x+stable+bzr727+pack22+201504291801~ubuntu14.04.1/build/lttng-events.c:27:
> > 	/var/lib/dkms/lttng-modules/2.6.x+stable+bzr727+pack22+201504291801~ubuntu14.04.1/build/wrapper/../lttng-kernel-version.h:60:57:
> > error: operator '+' has no right operand 	((LINUX_VERSION_CODE *
> > 1000000ULL)
> > + DEBIAN_API_VERSION)
> 
> I pushed the following fix into master and stable-2.6 branches
> of lttng-modules. Can you give it a try ?
> 
> commit a748963b76f353d459a3faf85eecc96f52811eee
> Author: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
> Date:   Thu May 14 09:13:49 2015 -0400
> 
>     Fix: build against Ubuntu kernels
>     
>     Recent Ubuntu kernels appear to define DEBIAN_API_VERSION, but they are
>     not really a Debian kernel per-se: the abi-debian-version.sh cannot find
>     the expected Debian kernel version string layout.
>     
>     Therefore, change the conditional check to use directly the
>     LTTNG_DEBIAN_VERSION_CODE define, which is defined only when the
>     abi-debian-version.sh script figures out it builds against a Debian
>     kernel.
>     
>     Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>

I reverted this commit. DEBIAN_API_VERSION is actually
the define I use to communicate between the makefile
and the C code. It should work even if not defined
(see the check in LTTNG_DEBIAN_KERNEL_RANGE()).

Hrm. But it appears that the operators generated by
those macros end up being invalid if DEBIAN_API_VERSION
is undefined. Will fix and push upstream.

Thanks,

Mathieu

> 
> Thanks,
> 
> Mathieu
> 
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev at lists.lttng.org
> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> 
> --
> 
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
> 
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> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com