Where is the right spot to apply an elaboration pragma to a library level subprogram? GNAT (20210519-103) complains that in the below code C cannot with subprogram A.B because it's not Pure, but it certainly appears to be, and no amount of shuffling around the pragma in B seems to placate it. Playing with the declaration of T seems to change the behavior; is GNAT is just misreporting a different error?

Thanks

-sb

package A is
pragma Pure;
type T is limited null record;
end A;

procedure A.B (x : T) is
pragma Pure; -- is this the right spot?
begin
null;
end A.B;

with A.B; -- error: cannot depend on "B" (wrong categorization)
package C is
pragma Pure;
end C;

On 21/01/2023 23:43, Simon Belmont wrote:
> Where is the right spot to apply an elaboration pragma to a library level subprogram? GNAT (20210519-103) complains that in the below code C cannot with subprogram A.B because it's not Pure, but it certainly appears to be,

To be pure it can contain only things that can be pre-elaborated, iirc,
so only types, no functions.

> and no amount of shuffling around the pragma in B seems to placate it. Playing with the declaration of T seems to change the behavior; is GNAT is just misreporting a different error?
>
> Thanks
>
> -sb
>
>
> package A is
> pragma Pure;
> type T is limited null record;
> end A;
>
> procedure A.B (x : T) is
> pragma Pure; -- is this the right spot?
> begin
> null;
> end A.B;
>
> with A.B; -- error: cannot depend on "B" (wrong categorization)
> package C is
> pragma Pure;
> end C;

A subprogram is a program unit and may be declared pure. I do not see that A.B performs any of 10.2.1(15ff).

I tried
procedure A.B (x : T) with Pure;
which is accepted together with its body and still got the compiler complaint.

Looks like a compiler problem.

On 22/1/23 20:55, AdaMagica wrote:
> A subprogram is a program unit and may be declared pure. I do not see that A.B performs any of 10.2.1(15ff).
>
> I tried
> procedure A.B (x : T) with Pure;
> which is accepted together with its body and still got the compiler complaint.
>
> Looks like a compiler problem.

If you are on linux, then you could set the stack size with

$ ulimit -s unlimited
$ launch_my_app

Regards.

On 23/1/23 10:14, Rod Kay wrote:
> On 22/1/23 20:55, AdaMagica wrote:
>> A subprogram is a program unit and may be declared pure. I do not see
>> that A.B performs any of 10.2.1(15ff).
>>
>> I tried
>> procedure A.B (x : T) with Pure;
>> which is accepted together with its body and still got the compiler
>> complaint.
>>
>> Looks like a compiler problem.
>
>    If you are on linux, then you could set the stack size with
>
>    $ ulimit -s unlimited
>    $ launch_my_app
>
>
>
> Regards.

Sorry, wrong thread :/ .