gnat 4.9.2 on arm with rtems

[Sebastian Huber]

On 28/10/15 15:22, Jan Sommer wrote:
> I got it working. The Set function was always overwriting the address of the previous ATCB, so STPO.Self was always returning the ATCB of the task created last.
> It turns out that I was building rtems without the --enable-ada option. The option is not mentioned in configure --help and gnat still builds fine.
>
> Would it be possible to not have the symbol rtems_task_self if the --enable-ada switch is off? Then linking gnat should fail with an undefined reference.
> I don't know too much of the rtems internals, but maybe it is as easy as adding ifdefs around the SCORE_EXTERN void *rtems_ada_self in score/threadimpl.h?

Since you work on this area, this task variable should go way, since its 
broken on SMP systems. I would replace it

     o with functions, e.g. rtems_ada_get_self() and 
rtems_ada_set_self(), or
     o POSIX keys, or
     o thread-local storage.

POSIX keys and thread-local storage would make the --enable-ada option 
superfluous. Thread-local storage is more efficient. It is well 
supported on ARM, PowerPC and SPARC on RTEMS.

>
> @Joel: What shall I do about the changes I made to gcc/ada/s-osinte-rtems.ads and newlib/libc/sys/rtems/sys/cpuset.h ? Just send the patches to you or should I  push them to the respective lists with you CC?

Please send them as patches to the corresponding lists and CC 
devel@rtems.org.

-- 
Sebastian Huber, embedded brains GmbH

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