Re: GNAT for Cross Compilation

[nettleton@ccfn.demon.co.uk (Chris Nettleton)]

Kendall Lemley <klemley@afit.af.mil> wrote:

>Hi-
>
>   I am fairly new to GNAT and am interrested in trying to set it up to
>cross compile Ada code for a student research project.  Our host machine
>is a Sun Sparc (running SunOS4.1.3) and the target is a 68030 board.  I
>have gotten GNAT 3.05 up and running on the native SUN (I assume this is
>the first step).  However, I have been unable to find any documentation
>on how to proceed to set up the cross compiler.  Has anyone out there
>done this before, or know where I might look to learn how to do this?

We are in the process if building a cross compilation system for a
68020 board. The compiler itself is not much of a problem once you've
sorted out what to call the various programs (e.g. m68k-coff-gcc), and
updated programs like gnatmake to call the cross compiler. The bulk of
the implementation effort is in the run-time system and debugger
support. 

Assuming you have a bare board target computer, then you will need to
provide the basic C libraries such as libc, libm, libpthreads if you
plan to support the full Ada 95 language. On the other hand if you
don't plan to use input-output, memory management or tasking then you
can get away with a mimimal run-time system that initialises the stack
and calls the main program.