Re: Curiousity: pragma No_Run_Time for Gnat

["Sergey Koshcheyev" <serko84@hotmail.com>]

"Marin David Condic" <dont.bother.mcondic.auntie.spam@[acm.org> wrote in
message news:9oo006$fdf$1@nh.pace.co.uk...
> The GNAT reference manual says this about pragma No_Run_Time:
>
> <snip>
>
> Would this mean that the Gnat 3.13p I have installed on my PC here would
> generate code that assumes nothing about the environment other than the
> processor it is targeting? (Assuming that the code did not contain
> constructs for which runtime is required.) That is to say - if I write a
> procedure that contains a "pragma No_Run_Time" directive, that if I can
get
> it past the compiler, I'll have raw machine code with no OS calls, no
> runtime calls, nothing except x86 machine code?

My experience (I don't have the GNORT documentation) was that GNAT indeed
produced "self-contained" executables when this pragma was used, except it
once needed to call memcpy from the C library (when copying arrays), but I
linked that in statically.

Serge Robyns has written a small OS kernel using GNAT and pragma No_Run_Time
this way. It can be found at http://web.wanadoo.be/rc.s/AdaOS/index.html

Sergey Koshcheyev