Split up confdefs.h into multiple header files?

[Sebastian Huber]

On 05/12/2019 15:07, Joel Sherrill wrote:
> 
> 
> On Thu, Dec 5, 2019 at 7:56 AM Sebastian Huber 
> <sebastian.huber at embedded-brains.de 
> <mailto:sebastian.huber at embedded-brains.de>> wrote:
> 
>     Hello,
> 
>     the next thing I would like to work on is a specification of the
>     application configuration (e.g. confdefs.h defines).
> 
>     The confdefs.h header file is quite big and difficult to review.
>     What do
>     you think about splitting this file into smaller parts, so that
>     confdefs.h consists of something like this:
> 
>     #include <rtems/config/classictask.h>
>     #include <rtems/config/classicsema.h>
>     #include <rtems/config/bdbuf.h>
>     #include <rtems/config/posixthread.h>
>     ...
> 
>     ?
> 
> 
> I think this MIGHT be a good idea. But I think you might want to
> look at the top and bottom of the file first. What files will 
> instantiate the
> data structures? There is also some error checking at the bottom
> which probably could be a sub-file.
> 
> Will there be logic to prevent including them from any other file?

My goal is to make the configuration more modular so that the component 
configuration can be tested individually. This means tests should be 
able to just include a subset of the configuration. This is of course 
not the intended use case for applications.

> 
> What about file system configuration?
> 
> Once you decompose that, will there actually be enough content to
> justify a file per manager/capability? I understand this makes it easier
> to track to a manager.
> 
> Where do user init task/threads go?
> 
> Just random thoughts? I can see "capability" or "area" oriented files
> but going down to a manager feels too fine grain.

Yes, I guess it will be a mix of areas and managers. Some configuration 
options are quite entangled, e.g. the bdbuf configuration influences the 
Classic AP task maximum, device drivers in a table, initial extensions 
in a table, etc.

-- 
Sebastian Huber, embedded brains GmbH

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