Support switching compiler and flags easily

scm/inc/Makefile

CC=gcc
CFLAGS=-Wall -g -O3
run-scheme: scheme
	./scheme
scheme: scheme.s driver.c
	gcc -g scheme.s driver.c -o $@
	$(CC) $(CFLAGS) scheme.s driver.c -o $@
scheme-static: scheme.s driver.c
	gcc -O3 -static scheme.s driver.c -o $@
	$(CC) $(CFLAGS) -static scheme.s driver.c -o $@
test: scheme.s driver.c
	petite --script tests.scm