I'm going through the Crenshaw tutorial http://compilers.iecc.com/crenshaw/ but translating from TurboPascal/68K to Python/x86. I've only just begun: I just finished the second section of the tutorial, but I have found this helpful. Works on Snow Leopard

run.sh

#!/bin/sh
# (c) 2009 Colin Barrett <colin@springsandstruts.com>
# MIT Licensed.

echo '	.cstring
format_string:
	.asciz "Result: %d\\n"
	.text
.globl _main
_main:
	pushl %ebp
	movl %esp, %ebp
	subl $8, %esp
' > temp.s

cat /dev/stdin | python cradle2.py > tempOutput
cat tempOutput >> temp.s

echo '
	movl %eax, 4(%esp)
	call _nextInstructionAddress
myAnchorPoint:
	leal format_string-myAnchorPoint(%ebx), %eax
	movl %eax, (%esp)
	call _printf
	
	leave
	ret

_nextInstructionAddress:
	movl (%esp), %ebx
	ret' >> temp.s

if [[ $1 == "--full" ]]
then
	cat temp.s
else
	cat tempOutput
fi

gcc temp.s

if [[ $1 != "--no-run" ]]
	rm -rf temp.s
	rm -rf tempOutput
then
	./a.out
	rm -rf a.out
	rm -rf temp.s
	rm -rf tempOutput
fi