New build system update

[Sebastian Huber]

On 21/04/2020 19:15, Gedare Bloom wrote:

>> A Doorstop installation is no longer required. The build specification
>> can be maintained with a text editor. It could be useful to add a "./waf
>> verify-spec" command to verify that the build specification items are sane.
>>
> I suggest opening a ticket for verify-spec at 6.1 or open-ended. It is
> a good idea.
>
https://devel.rtems.org/ticket/3963