I spent like 3 days trying to install / compile it on my mac for stm32f4, I couldn't get it to work. I can't imagine doing open source with a compiler nobody can install. I'm pretty bummed, and no other implementation than gnat seems to free. So, the whole language is out of reach.

It's too bad, because i have some real time embedded stuff to write on a very light platform, and I'm stuck with C (I might try to strip some C++ executables again in the future, but I don't think C++ is a suited as Ada would be)