Generating shellcode at compile time

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I need to generate some sort of strcpy()able shell code.  Probably
something to do

_exit(255);

would be quite enough; though more in-depth demonstrations would benefit
from being able to actually display a live exploit.  Something like
calling exec("/bin/bash") for example.

I'm working on an x86-64, but would like to be able to demonstrate
exploits and what PaX and the IBM stack smash protector do to stop them
on x86-64, x86, SPARC, PPC, SPARC64, and PPC64.

In the worst case, each shellcode could be individually created and
passed as a reaction to having the example daemon reveal the host type
(which may be useful in dual-host demonstrations where I could exploit a
PPC with an x86); however, I have not the time nor the need to invest my
time in generating such shellcode myself.

I'm not so sure what I want to do, but _exit(255) is fine for my
regression tests.

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