[lttng-dev] cross-compiling lttng-ust and python version

[Jérémie Galarneau]

On Mon, May 12, 2014 at 10:24 AM, Gerlando Falauto
<gerlando.falauto at keymile.com> wrote:
> Hi,
>
> I am trying to cross-compile lttng-ust for a powerpc platform.
>
> I get the following error during make:
>
> ../../../tools/lttng-gen-tp -o sample_tracepoint.h sample_tracepoint.tp
> 'import site' failed; use -v for traceback
> Traceback (most recent call last):
>   File "../../../tools/lttng-gen-tp", line 19, in <module>
>     from __future__ import print_function
> ImportError: No module named __future__
>

This module should be present in Python 2.7. Which versions are
installed on your host system and on which distribution is this?

Can you confirm the __future__.py file is present under
/lib/python2.7/ on your system?

Thanks,
Jérémie

> I believe the wrong python version is called ("python" instead of
> "python2.7"), as the first line of tools/gen-tp reads:
>
> #!/usr/bin/env python
>
> Notice how I explicitly set the python version in my configure script:
>
> ac_cv_header_linux_perf_event_h=no PYTHON=python2.7 ./configure
> --target=powerpc-linux --host=powerpc-linux --build=i686-linux
> --with-libtool-sysroot=/opt/eldk/powerpc/sysroots/powerpc-linux
> --prefix=/usr
>
> MAKEFLAGS= && DESTDIR=/opt/eldk/powerpc/sysroots/powerpc-linux make all
> install install-strip pkgconfigdir=/tmp pkgconfig_DATA=
>
> Which doesn't seem to help in this case though.
> Any idea how to fix this?
>
> I temporarily tried patching
> -#!/usr/bin/env python
> +#!/usr/bin/env python2.7
>
> which partially solves my problem; as a matter of fact, I get this new
> error:
>
>   File "../../../tools/lttng-gen-tp", line 24, in <module>
>     import subprocess
> ImportError: No module named subprocess
>
> which is a somwhat different issue, as I'm now running python2.7 from the
> sysroot of my cross-compiler environment (which doesn't apparently have
> subprocess.py).
>
> $ which python2.7
> /opt/eldk/powerpc/sysroots/i686-eldk-linux/usr/bin/python2.7
>
> Any suggestions here?
> Even though it might look like the easiest solution, I'd rather not install
> a native 2.7 (or higher) python version on my build machine.
>
> Thank you!
> Gerlando
>
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-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com