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From: Simon Wright <simon@pushface.org>
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Subject: Re: How to get Ada to =?utf-8?Q?=E2=80=9Ccross?= the =?utf-8?Q?ch?=
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Date: Sun, 06 May 2018 18:40:26 +0100
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Date: 2018-05-06T18:40:26+01:00
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Niklas Holsti <niklas.holsti@tidorum.invalid> writes:

> On 18-05-06 13:16 , Simon Wright wrote:
>> Niklas Holsti <niklas.holsti@tidorum.invalid> writes:
>>
>>> On 18-05-06 11:02 , Simon Wright wrote:
>>>> Dennis Lee Bieber <wlfraed@ix.netcom.com> writes:
>>>>
>>>>> 	And for the avionics I have been exposed to -- you do not use
>>>>> constructs that require the secondary stack... Same reason -- size
>>>>> not known until run-time.
>>>>
>>>> Just for interest, I just rebuilt AdaCore's Certyflie with the
>>>> restriction No_Secondary_Stack; no problems.
>>>
>>> Just from curiosity: did you check that the linked program did not
>>> include any secondary-stack functions? I've found that some versions
>>> of GNAT Pro for the SPARC/LEON do not fully obey the
>>> No_Secondary_Stack restriction in the gnat.adc file.
>>
>> The map file only shows that s-secsta was linked because of
>> s-tarest. Maybe the map only shows the first reason for linking. I see
>> that although the main crazyflie application doesn't use the secondary
>> stack, the support library does; and sure enough, it's string
>> catenation, in one place, in the logging subsystem. Could have been
>> avoided by careful assignment to slices of a fixed string.
>
> So GNAT did not complain about the support library violating
> No_Secondary_Stack?
>
> Perhaps someone should report this to AdaCore... I'll put it on my
> to-do-list, for the SPARC/LEON compiler case.

Hold fire on that! the restriction was only applied in the application
project, not the support library.

When I applied the retriction to the support library, it found 12 units
that couldn't be compiled: only one of these was in Ada_Drivers_Library
(stm32-board.adb; but there were 3 spec files that failed the check).