* [lttng-dev] Question/Issue compilation ARMv7 of LTTng
@ 2021-03-30 22:29 MONTET Julien via lttng-dev
2021-03-31 15:18 ` Jonathan Rajotte-Julien via lttng-dev
0 siblings, 1 reply; 2+ messages in thread
From: MONTET Julien via lttng-dev @ 2021-03-30 22:29 UTC (permalink / raw)
To: lttng-dev
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Hello the developpers !
On my side, userspace and kernel event are working for both x86_64 and 32bits on Ubuntu 20.04.
One of my main goals is to use LTTng on an armv7 target (Raspbian 32 bits).
I am using Docker to create the environment and to compile the image (Debian 9.3).
During the compilation of RCU, I get :
#10 5.868 checking whether the C compiler works... no
#10 5.982 configure: error: in `/tmp/tmp.T2I20x25bo/userspace-rcu-0.12.2':
#10 5.983 configure: error: C compiler cannot create executables
My question is the following : Can LTTng be used directly on arm ?
https://lttng.org/docs/v2.10/#doc-instrumenting-32-bit-app-on-64-bit-system
I read again the tutorial and it seems we always need a 64-bits platform.
Find below a part of my Dockerfile (that looks like the tuto):
# LTTng RCU - 32 bits
RUN bin/sh -c 'cd $(mktemp -d)' && \
wget https://lttng.org/files/urcu/userspace-rcu-0.12.2.tar.bz2 && \
tar -xvf userspace-rcu-0.12.2.tar.bz2 && \
cd userspace-rcu-0.12.2 && \
./configure --libdir=/usr/local/lib32 CFLAGS=-m32 && \
make && \
make install && \
ldconfig
I tried to run the installation on the docker file of gcc-multilib, build-essential, wget... but it doesn't work.
Cheers,
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* Re: [lttng-dev] Question/Issue compilation ARMv7 of LTTng
2021-03-30 22:29 [lttng-dev] Question/Issue compilation ARMv7 of LTTng MONTET Julien via lttng-dev
@ 2021-03-31 15:18 ` Jonathan Rajotte-Julien via lttng-dev
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Rajotte-Julien via lttng-dev @ 2021-03-31 15:18 UTC (permalink / raw)
To: MONTET Julien; +Cc: lttng-dev
Hi,
On Tue, Mar 30, 2021 at 10:29:22PM +0000, MONTET Julien via lttng-dev wrote:
> Hello the developpers !
>
> On my side, userspace and kernel event are working for both x86_64 and 32bits on Ubuntu 20.04.
> One of my main goals is to use LTTng on an armv7 target (Raspbian 32 bits).
Ok.
>
> I am using Docker to create the environment and to compile the image (Debian 9.3).
> During the compilation of RCU, I get :
> #10 5.868 checking whether the C compiler works... no
> #10 5.982 configure: error: in `/tmp/tmp.T2I20x25bo/userspace-rcu-0.12.2':
> #10 5.983 configure: error: C compiler cannot create executables
I would suggest that you have a look in the config.log file and share with us
the complete file, as always use a paste service if possible.
>
> My question is the following : Can LTTng be used directly on arm ?
It can absolutely be used on arm.
For example see our portbuild testing matrix here:
URCU:
https://ci.lttng.org/job/liburcu_master_portbuild/
LTTng-tools:
https://ci.lttng.org/job/lttng-tools_master_portbuild/
> https://lttng.org/docs/v2.10/#doc-instrumenting-32-bit-app-on-64-bit-system
> I read again the tutorial and it seems we always need a 64-bits platform.
On 32bit only platform you are limited to 32bit tracing and all the limitation
related to 32bit, if any is applicable to your use case.
>
> Find below a part of my Dockerfile (that looks like the tuto):
> # LTTng RCU - 32 bits
> RUN bin/sh -c 'cd $(mktemp -d)' && \
> wget https://lttng.org/files/urcu/userspace-rcu-0.12.2.tar.bz2 && \
> tar -xvf userspace-rcu-0.12.2.tar.bz2 && \
> cd userspace-rcu-0.12.2 && \
> ./configure --libdir=/usr/local/lib32 CFLAGS=-m32 && \
> make && \
> make install && \
> ldconfig
>
> I tried to run the installation on the docker file of gcc-multilib, build-essential, wget... but it doesn't work.
Our project use standard autotools/make mechanism for cross compilation scenarios: https://www.gnu.org/software/automake/manual/html_node/Cross_002dCompilation.html
I am not aware of any problem at this level but after looking around our CI I
think we do not do a lot of cross compilation. Still I know that yocto and
buildroot use cross-compilation for lttng and its dependencies without any major
modification.
Still, we will wait for the config.log file before putting this in the: not a lttng problem.
Cheers
--
Jonathan Rajotte-Julien
EfficiOS
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2021-03-30 22:29 [lttng-dev] Question/Issue compilation ARMv7 of LTTng MONTET Julien via lttng-dev
2021-03-31 15:18 ` Jonathan Rajotte-Julien via lttng-dev
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