I'm not quite sure if I'm going to have time to do this real soon,  so
this might be a slightly academic question.

Tell me if this is a sensible plan of attack.

0.  Install a more modern GCC on the NetBSD/68k machine so that I'll
have a decent RTL back-end.  (Currently it's gcc 2.4.5 running under
NetBSD1.1 on a macintosh).

     +----------+       +---------+
     |NetBSD/68k|       |x86 Linux|
     +----------+       +---------+
     |68k gcc   |       |x86 gcc  |
     +----------+       +---------+

1.  Build a 68k GCC cross-compiler under x86 Linux (My only non-68k
machine).

     +----------+       +---------+
     |NetBSD/68k|       |x86 Linux|
     +----------+       +---------+
     |68k gcc   |       |x86 gcc  |
     +----------+       |68k gcc  |
                        +---------+

2.  Install GNAT over the 68k-gcc.  (Is this as simple as it sounds?.

     +----------+       +---------+
     |NetBSD/68k|       |x86 Linux|
     +----------+       +---------+
     |68k gcc   |       |x86 gcc  |
     +----------+       |68k gcc  |
                        |68k GNAT |
                        +---------+

3.  Take the source to the x86-NetBSD GNAT run-time libraries
and compile it with the Linux-hosted 68k-GNAT compiler.

     +----------+       +---------+
     |NetBSD/68k|       |x86 Linux|
     +----------+       +---------+
     |68k gcc   |       |x86 gcc  |
     |BSD rts   |       |68k gcc  |
     +----------+       |68k GNAT |
                        +---------+

4.  Use the Linux-hosted GNAT to compile GNAT for NetBSD.

     +----------+       +---------+
     |NetBSD/68k|       |x86 Linux|
     +----------+       +---------+
     |68k gcc   |       |x86 gcc  |
     |BSD rts   |       |68k gcc  |
     |GNAT      |       |68k GNAT |
     +----------+       +---------+

5.  Install this GNAT over gcc.

6  (Optionally).  Compile the compiler itself to make sure it's
capable of it and hasn't suffered bit rot.

As far as I can tell,  the only tricky part is building the cross
compiler.  Would it be easier if I hosted it on an x86-NetBSD machine?
Is building a GNAT cross compiler difficult?

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