<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Nov 25, 2019 at 3:19 PM Chris Johns <<a href="mailto:chrisj@rtems.org">chrisj@rtems.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 26/11/19 8:05 am, Joel Sherrill wrote:<br>
> On Mon, Nov 25, 2019 at 2:12 AM Sebastian Huber<br>
> <<a href="mailto:sebastian.huber@embedded-brains.de" target="_blank">sebastian.huber@embedded-brains.de</a> <mailto:<a href="mailto:sebastian.huber@embedded-brains.de" target="_blank">sebastian.huber@embedded-brains.de</a>>><br>
> wrote:<br>
> <br>
> On 25/11/2019 08:55, Chris Johns wrote:<br>
> ><br>
> > On 25/11/19 5:28 pm, Sebastian Huber wrote:<br>
> >><br>
> >> On 24/11/2019 23:25, Chris Johns wrote:<br>
> >>>>> Should there be a note or something about waf needing python and we<br>
> recommend<br>
> >>>>> python3? Plus waf needs a `python` installed and not just `python2` or<br>
> >>>>> `python3`?<br>
> >>>> I think this belongs to the Host Computer section. The quick start uses the<br>
> >>>> RSB, so if you managed to build the tools, you must have a working Python.<br>
> >>>> The RSB uses Python and the RTEMS Tools use waf.<br>
> >>> The RSB can use python2 or python3 without a python. What about a note<br>
> to say<br>
> >>> ... "Waf uses python and you need to make this command available on your<br>
> system".<br>
> >> Now I am a bit confused. I thought every UNIX-like system provides a<br>
> >><br>
> >> #!/usr/bin/env python<br>
> >><br>
> >> which maps to Python 2 or 3?<br>
> >><br>
> > Apparently on some distros the python executable is not automatically<br>
> installed<br>
> > with a suitable python2 or python3. I am not aware of the specifics of<br>
> this but<br>
> > it was raised as an issue that I fixed in the RSB:<br>
> ><br>
> > <a href="https://devel.rtems.org/ticket/3537" rel="noreferrer" target="_blank">https://devel.rtems.org/ticket/3537</a><br>
> <br>
> I have never seen a system in which<br>
> <br>
> #!/usr/bin/env python2<br>
> <br>
> or<br>
> <br>
> #!/usr/bin/env python3<br>
> <br>
> works, but not<br>
> <br>
> #!/usr/bin/env python<br>
<br>
I agree however this is the post from Joel about a class he held ...<br>
<br>
<a href="https://lists.rtems.org/pipermail/devel/2018-October/023150.html" rel="noreferrer" target="_blank">https://lists.rtems.org/pipermail/devel/2018-October/023150.html</a><br>
<br>
and I posted the change here ...<br>
<br>
<a href="https://lists.rtems.org/pipermail/devel/2018-October/023296.html" rel="noreferrer" target="_blank">https://lists.rtems.org/pipermail/devel/2018-October/023296.html</a><br>
<br>
> How many Python scripts would stop to work in this case? However, the<br>
> availability of a python command is not mandatory according to:<br>
> <br>
> <a href="https://www.python.org/dev/peps/pep-0394/" rel="noreferrer" target="_blank">https://www.python.org/dev/peps/pep-0394/</a><br>
<br>
I am aware of this and I support it however Linux distros seems to feel there<br>
are cases for exceptions, we have this one and there is also pax.<br>
<br>
The pax and this python case are similar, do we say "We are correct, fix your<br>
host or raise a bug on your distro" or do we attempt to smooth over the cracks<br>
and attempt to just work?<br>
<br>
In the case of ubuntu, maybe someone with some experience with it can see what<br>
is needed and update the documentation?<br>
<br>
> I think we should note in the "Host Computer" section that a "python"<br>
> command is mandatory for RTEMS and remove the RSB extra stuff.<br>
<br>
The argument was presented to me that the RSB should just work even in this case<br>
and so that is what I did. I am fine to remove that support, it is an average hack.<br>
<br>
> Chris can answer to that.<br>
<br>
Done.<br>
<br>
> But on Centos 7, we have:<br>
> <br>
> $ type python<br>
> python is /usr/bin/python<br>
> $ python --version<br>
> Python 2.7.5<br>
> $ type python2<br>
> python2 is /usr/bin/python2<br>
> $ type python3<br>
> bash: type: python3: not found<br>
> $ env python<br>
> Python 2.7.5 (default, Aug 7 2019, 00:51:29)<br>
> [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux2<br>
> Type "help", "copyright", "credits" or "license" for more information.<br>
>>>> <br>
> <br>
> and if I activate the SCL for Python 3:<br>
> <br>
> $ scl enable rh-python36 bash <br>
> <br>
> [joel@localhost rtems-work]$ type python <br>
> <br>
> python is /opt/rh/rh-python36/root/usr/bin/python <br>
> <br>
> [joel@localhost rtems-work]$ python --version <br>
> <br>
> Python 3.6.3 <br>
<br>
And on ubuntu? The original post was about that distro.<br></blockquote><div><br></div><div> Welcome to Ubuntu 18.04.3 LTS (GNU/Linux 4.15.0-66-generic x86_64) </div><div>....</div><div>$ type python<br>python is /usr/bin/python<br>$ python --version<br>Python 2.7.15+<br>$ env python<br>Python 2.7.15+ (default, Oct 7 2019, 17:39:04) <br>[GCC 7.4.0] on linux2<br>Type "help", "copyright", "credits" or "license" for more information.<br>>>> <br></div>$ python2<br>Python 2.7.15+ (default, Oct 7 2019, 17:39:04) <br>[GCC 7.4.0] on linux2<br>Type "help", "copyright", "credits" or "license" for more information.<br>>>> <br>$ python3<br>Python 3.6.8 (default, Oct 7 2019, 12:59:55) <br>[GCC 8.3.0] on linux<br>Type "help", "copyright", "credits" or "license" for more information.<br>>>> <br><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Chris<br>
</blockquote></div></div>