New source layout.

[Gedare Bloom]

On Thu, Mar 12, 2015 at 9:51 AM, Amar Takhar <amar at rtems.org> wrote:
> On 2015-03-12 09:45 -0400, Gedare Bloom wrote:
>> This doesn't work in supposedly CPU-independent source code files.
>>
>> Let's take percpu.h as an example. We need to include it in
>> <rtems/score/thread.h> -- the main header for thread scheduling that
>> is included by virtually every source file in the supercore. We can't
>> include the CPU-dependent headers here, unless we use the CPP #if-elif
>> cascase as mentioned by Sebastian.
>
> The eventual goal is everything would be distilled to a single header per arch
> that would have to be included in your application source.  Right now that is
> not possible and we do use the if-elif solution right now in the waf build as a
> stopgap.
>
Relying on the application to provide the header means coupling the
RTEMS build to the application build. This is an as-yet-undiscussed
direction that should be elaborated in a separate thread.

I might be happy with some CPP magic to hide the if-elif cascade if
that is plausible.
RTEMS_INCLUDE_CPU_SPECIFIC(cpu.h)
or some such.

> I've asked Chris to better explain this he understands the issues from an RTEMS
> perspective better than I do.  He also knows what the eventual goal of the
> header move is.
>
OK.

> To be clear: the intermediary period is already solved in the waf build nothing
> will have to change.  As we change / 'unwind' the headers we'll modify the
> source.  This is going to be a drawn out process.  The nice thing is any changes
> we make in this regard is verifiable by using hashes of the resulting objects.
>
>
> Amar.
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