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From: Wannabe h4x0r <chris@dont.spam.me>
Subject: Re: Ada Operating System
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On Sat, 23 Feb 2002 09:31:18 -0500, Florian Weimer wrote:

> Wannabe h4x0r <chris@dont.spam.me> writes:
> 
>> The correct statement would be that GNAT is written in Ada95 and the
>> GCC RTL. i.e. GCCs internal representation tokens.
> 
> I wouldn't phrase it this way.  GNAT trees are converted to GCC trees,
> and this portion of the compiler is written in K&R C.  AFAIK, most of
> the time, it doesn't deal with RTL generation directly, either.  RTL
> generation from trees is the job of the GCC backend.
> 
> You can't implement GCC functionality in RTL (only by transforming RTL,
> but that's a different matter ;-).
> 
>> As far as I know, there is not a single line of C code anywhere in the
>> GNAT source code "proper".  I could be mistaken, but I dont think I am.
> 
> GNAT performs file I/O using the standard C library, for example. Some
> low-level parts of the runtime library are written in C, too.

Alright. I stand corrected. I did take a look at the source and I did
find some "glue" code written in C.

Nonetheless, it wouldn't be too difficult to build a stand alone compiler
 distinct from GCC using the GNAT sources and some creative use of Annex
C in the LRM I suspect. No?

Chris