New Build System Status

[Joel Sherrill]

On Mon, Nov 25, 2019 at 2:12 AM Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 25/11/2019 08:55, Chris Johns wrote:
> >
> > On 25/11/19 5:28 pm, Sebastian Huber wrote:
> >>
> >> On 24/11/2019 23:25, Chris Johns wrote:
> >>>>> Should there be a note or something about waf needing python and we
> recommend
> >>>>> python3? Plus waf needs a `python` installed and not just `python2`
> or
> >>>>> `python3`?
> >>>> I think this belongs to the Host Computer section. The quick start
> uses the
> >>>> RSB, so if you managed to build the tools, you must have a working
> Python.
> >>>> The RSB uses Python and the RTEMS Tools use waf.
> >>> The RSB can use python2 or python3 without a python. What about a note
> to say
> >>> ... "Waf uses python and you need to make this command available on
> your system".
> >> Now I am a bit confused. I thought every UNIX-like system provides a
> >>
> >> #!/usr/bin/env python
> >>
> >> which maps to Python 2 or 3?
> >>
> > Apparently on some distros the python executable is not automatically
> installed
> > with a suitable python2 or python3. I am not aware of the specifics of
> this but
> > it was raised as an issue that I fixed in the RSB:
> >
> > https://devel.rtems.org/ticket/3537
>
> I have never seen a system in which
>
> #!/usr/bin/env python2
>
> or
>
> #!/usr/bin/env python3
>
> works, but not
>
> #!/usr/bin/env python
>
> How many Python scripts would stop to work in this case? However, the
> availability of a python command is not mandatory according to:
>
> https://www.python.org/dev/peps/pep-0394/
>
> I think we should note in the "Host Computer" section that a "python"
> command is mandatory for RTEMS and remove the RSB extra stuff.
>

Chris can answer to that.

But on Centos 7, we have:

$ type python
python is /usr/bin/python
$ python --version
Python 2.7.5
$ type python2
python2 is /usr/bin/python2
$ type python3
bash: type: python3: not found
$ env python
Python 2.7.5 (default, Aug  7 2019, 00:51:29)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

and if I activate the SCL for Python 3:

$ scl enable rh-python36 bash


[joel at localhost rtems-work]$ type python


python is /opt/rh/rh-python36/root/usr/bin/python


[joel at localhost rtems-work]$ python --version


Python 3.6.3


>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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