d_MODE ?= gdc

D ?= $(d_MODE)

ifeq ($(D),gdc)
CFLAGS += -g -O2 -Wall
LDFLAGS += -lreadline
OF = -o $@
else ifeq ($(D),ldc2)
CFLAGS += -g -O2
LDFLAGS += -L-lreadline
OF = -of $@
else ifeq ($(D),dmd)
CFLAGS += -g -O
LDFLAGS += -L-lreadline
OF = -of=$@
else
	@echo "Unsupported D implementation $(D)"
	@exit 1
endif

#####################

EARLY_SRCS = step0_repl.d step1_read_print.d step2_eval.d
LATE_SRCS = step3_env.d step4_if_fn_do.d step5_tco.d step6_file.d \
	    step7_quote.d step8_macros.d step9_try.d stepA_mal.d
SRCS = $(EARLY_SRCS) $(LATE_SRCS)
OBJS = $(SRCS:%.d=%.o)
BINS = $(OBJS:%.o=%)
EARLY_OBJS = types.o readline.o reader.o printer.o env.o
OTHER_OBJS = $(EARLY_OBJS) mal_core.o
EARLY_STEPS_BINS = $(EARLY_SRCS:%.d=%)
LATE_STEPS_BINS = $(LATE_SRCS:%.d=%)

#####################

all: $(BINS)

dist: mal

mal: $(word $(words $(BINS)),$(BINS))
	cp $< $@

$(OBJS) $(OTHER_OBJS): %.o: %.d
	$(D) $(CFLAGS) -c $(@:%.o=%.d) $(OF)

$(EARLY_STEPS_BINS): $(EARLY_OBJS)
$(LATE_STEPS_BINS): $(OTHER_OBJS)

$(BINS): %: %.o
	$(D) $+ $(OF) $(LDFLAGS)

clean:
	rm -f $(OBJS) $(BINS) $(OTHER_OBJS) mal