Re: GNAT and no runtime

[JCS <SANS.SPAM@MERCI.FR>]

On Wed, 26 May 2004 00:46:26 -0700, Rolf Ebert wrote:
> Start slowly putting more and more things to your runtime.  You almost
> certainly already have system.ads and some dummy (i.e. empty)
> libgnat.a.
Well, not exactly, I still use the predefined specs, and do not link with
any form of library (I don't use gnatlink, but directly ld instead)

> That is needed even in the case of No_Runtime.   You can easily add
> things like a-uncconv, s-stoele, interface, s-maccod.  They all just
> need to be present at compile time, but aren't needed at link time (OK,
> the .ali's are, not the .o).
I see, you suggest that I implement a minimal subset of libgnat. I was not
planning to do that so soon. I though it wouldn't be necessary for the
kernel itself. But it seems that I was wrong. Hope it won't be too hard...
I've already looked a bit in the GNAT sources, but to be honnest I was a
bit lost, the link you gave will probably be very helpful. Thanks.

> 
> Replace the pragma restriction (No_Runtime) in gnat.adc by all the
> detailed restrictions that you can find.  Then remove the restriction
> that you don't want to enforce anymore and see what runtime support is
> needed and add it to your project.
Yes, this is exactly what I've done, except that I still use pragma
No_Runtime, just to be sure of what I'm enabling when I delete a
restriction.

Many thanks Rolf,
JC