[PATCH] user: Add hints for macOS Catalina

[Chris Johns]

> On 8 Nov 2019, at 5:20 pm, Sebastian Huber <Sebastian.Huber at embedded-brains.de> wrote:
> 
> On 07/11/2019 22:04, Chris Johns wrote:
>>> On 7/11/19 7:51 pm, Sebastian Huber wrote:
>>> Use macOS throughout.  Order release hints so that the latest macOS
>>> release comes first.
>> Thanks for this.
>>> +Catalina
>>> +~~~~~~~~
>>> +
>>> +In the
>>> +`macOS Catalina 10.15 Release Notes <https://developer.apple.com/documentation/macos_release_notes/macos_catalina_10_15_release_notes>`_
>>> +Apple deprecated several scripting language runtimes such as Python 2.7.
>> This is almost right, it is present in Catalina but will be removed in future
>> versions. This is inline with the removal of tools like emacs and so expected.
> 
> I used more or less the Apple wording. Deprecated means to me that you should start to investigate alternatives.

 Sure. 

> So, I added the recommendation to install Python from python.org. Apple says:
> 
> "Use of Python 2.7 isn’t recommended as this version is included in macOS for compatibility with legacy software. Future versions of macOS won’t include Python 2.7. Instead, it’s recommended that you run python3 from within Terminal. (51097165)"
> 
> What would you recommend to RTEMS users?

I think we should say they use python 3 and python.org. I will have to update my build box.

We will support python 2 for a while to come as there will be a number of older hosts in production. 

Chris