[PATCH 2/5] build: Use CSafeLoader if available

[Sebastian Huber]

On 15.05.23 01:44, Chris Johns wrote:
> On 5/5/2023 8:16 pm, Sebastian Huber wrote:
>> On 05.05.23 01:38, Chris Johns wrote:
>>>> When I install it
>>>> through pip, I get the CSafeLoader on my machine. I don't have a libyaml
>>>> development package installed.
>>> This is what I was not understanding. If it can be loaded in a python.org
>>> install on a N2 MacOS with a virtual env then I think we are close to a
>>> resolution.
>> I tried to understand how the PyYAML package is built. It seems that libyaml and
>> its header files need to be installed to use the C bindings.
> This is what I thought happened with this package. It depends on the base OS
> packaging system. The documentation at
> https://pyyaml.org/wiki/PyYAMLDocumentation  says:
> 
>   $ python setup.py install
> 
>   If you want to use LibYAML bindings, which are much faster than the pure
>   Python version, you need to download and install LibYAML. Then you may
>   build and install the bindings by executing
> 
>   $ python setup.py --with-libyaml install
> 
> I cannot see if pip has any further detail on the nature of the build it
> contains so this is not looking good. This leaves building and installing when
> the tools are built by the RSB.

The current approach with the pickle cache works reasonably fine and 
requires not extra packages. I don't think this implementation should be 
removed in any case. The support for the CSafeLoader is just about 60 
lines of additional code. It would be a nice improvement for systems 
supporting this feature. I don't have time to work on adding PyYAML with 
libyaml to the RTEMS Tools right now and I think this would open another 
maintenance issues. If someone would be unable to get a yaml module with 
a CSafeLoader, then he would be no longer able to build RTEMS.

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