why rtems_message_queue_create hang up the system?

[Yanjun Luo]

> 20 * 100 is ~20K.  I suspect your confdefs.h is not accounting
> for the memory OR you are linking against the Message Manager
> optional stub.
> 
> If you can step into the create, you will know for sure.

Finally, I found the reason.
I compared Makefile of sp13 and mine, found the difference.
sp13's makefile set "MANAGERS = io message", but my is
"MANAGERS = io".

I modified Makefile.am "MANAGERS = io message", it works.

Maybe freshman (like me) need more detailed document:-)

Regards,
Yanjun Luo.