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From: Simon Wright <simon@pushface.org>
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Jere <jhb.chat@gmail.com> writes:

>  The secondary stack is another example.  It can be implemented as
> static only (I do this for my bare metal runtimes), heap, or a
> combination of both based on size (I think GNAT does this normally?).

In Cortex GNAT RTS, I leave it as a fixed proportion of each task's
stack. (10% - in s-parame.adb). I believe that full GNAT has a mixed
strategy.

Info at [1] on pragma (and aspect, almost certainly)
Secondary_Stack_Size - which I don't support yet[2]. Nor do I have a
System.Parameter.Sec_Stack_Percentage :-( - more to do.

[1]
https://gcc.gnu.org/onlinedocs/gnat_rm/Pragma-Secondary_005fStack_005fSize.html
[2] as in, you can of course specify it, but I ignore it. Sorry.