Ragel state machine generation

Makefile

MACHINES=$(shell ls *.rl | xargs basename -s .rl)
CFLAGS= -O0 -g
RFLAGS= -V

# pattern rules
# see https://www.gnu.org/software/make/manual/html_node/Pattern-Rules.html#Pattern-Rules

%.o : %.c
	gcc $(CFLAGS) -o $@ $<

%.dot : %.rl
	ragel -V -o $@ $<

%.png : %.dot
	dot -Tpng $< -o $@

%.c : %.rl
	ragel -o $@ $<

# static pattern rule (for tab completion sake)
# see http://www.gnu.org/software/make/manual/html_node/Static-Usage.html#Static-Usage

$(MACHINES): %: %.c %.png
	gcc $(CFLAGS) -o $@ $<