[PATCH 1/3] build: Format build items

Amar Takhar amar at rtems.org
Thu Jan 19 19:01:47 UTC 2023

On 2023-01-19 08:21 +0100, Sebastian Huber wrote:
> In rtems-central.git there are Python modules and scripts which generate 
> source, header, and documentation files from specification items. This 
> repository contains the pre-qualification support for RTEMS. By 
> accident, a part of the build system uses also specification items. So, 
> if you want to change the format of the items, you can use the tooling 
> available in rtems-central.git to do this. An example is the recent 
> merge of the "default" and "default-by-variant" attributes.

Why are these in 'rtems-central' and not the RTEMS repository?  Why are we using 
tools with unpinned versioning generating files in RTEMS?

> The changes were made by a 10 liner throw away script. I could have done 
> the changes also manually it would be just more work.

This does not alter my above point.  I understand that in this case it was a 
script but the rest wasn't generated by a throw-away script.

> There is nothing to regenerate. The patch set contains simple format 
> changes and a transformation of attributes.
> However, your concern is still valid for the generated files, for example
> https://github.com/RTEMS/rtems/blob/master/cpukit/include/rtems.h
> which is generated from
> https://github.com/RTEMS/rtems-central/blob/master/spec/rtems/if/header.yml

Yes I do not like this at all both the software and header.yml should be sitting 
in our main repository.

> Most of the Classic API header files are generated from specification 
> items. If nobody takes care that rtems-central.git is used and stays up 
> to date the specification will get out of synchronization with rtems.git.

Okay but why is this sitting in rtems-central.git and not in rtems.git.  You've 
just made the argument that it's very important we don't want anything to be out 
of sync.

> > I'm not against the purpose of the tool or the work has been done but this is
> > not the correct way to handle generated files within a repository if we want to
> > maintain the ability to make changes or debug years down the line.
> I would use a single repository for RTEMS just like the FreeBSD base 
> system, but this is another discussion.

FreeBSD also uses a vendor system which brings all this code under a central 
repository.  They aren't maintaining code outside and then requiring FreeBSD to 
be built with it.  They even bring the compiler in this has an astounding impact 
on the usability of FreeBSD.

Recently I took a FreeBSD 3.1 image and rebuilt it for a customer who needed a 
change it was used in an appliance.  It just worked.

If I want to make a chance to rtems.h it's now generated from a header.yml with 
no version pinning how am I going to find the first header.yml to make a single 
change in 20 years?

rtems.h is a small file where we can get rid of it and move to another tool.  
It's integral and anything that works with it is integral this is arguably 


More information about the devel mailing list