SRCS = $(sort $(wildcard $(srcdir)/*.c))
OBJS = $(patsubst $(srcdir)/%.c,obj/%.o,$(SRCS))
DEPS = $(patsubst $(srcdir)/%.c,obj/%.d,$(SRCS))

gc_impl = sms

CFLAGS =
CPPFLAGS =
LDFLAGS =

# CFLAGS_AUTO = -fdata-sections -ffunction-sections -flto -g -O3 -std=c11 -Wall -Werror=implicit-function-declaration
# CFLAGS_AUTO = -g -Og -std=c11 -Wall -Werror=implicit-function-declaration
CFLAGS_AUTO = -flto -g -Og -std=c11 -Wall -Werror=implicit-function-declaration
LDFLAGS_AUTO =
LDLIBS_AUTO = -lm

CFLAGS_ALL = $(CPPFLAGS) $(CFLAGS_AUTO) $(CFLAGS)
LDFLAGS_ALL = $(LDFLAGS_AUTO) $(LDFLAGS)
LDLIBS_ALL = $(LDLIBS_AUTO) $(LDLIBS)

-include config.mak

ifeq ($(CONFIGURED),)

all:
	@printf >&2 'Please run mk.sh, not make.\n'
	@exit 1

else

include $(srcdir)/platform/$(platform).mk

imb3.elf: $(OBJS) obj/gc/$(gc_impl).o obj/platform/$(platform).o
	$(CC) $(CFLAGS_ALL) $(LDFLAGS_ALL) -o $@ $^ $(LDLIBS_ALL)

obj/%.o: $(srcdir)/%.c
	@mkdir -p $(dir $@)
	$(CC) $(CFLAGS_ALL) -c -o $@ $<

# https://www.gnu.org/software/make/manual/html_node/Automatic-Prerequisites.html
obj/%.d: $(srcdir)/%.c
	@mkdir -p obj
	@set -e; rm -f $@; \
	 $(CC) -M $(CPPFLAGS) $< > $@.$$$$; \
	 sed 's,\($*\)\.o[ :]*,obj/\1.o $@ : ,g' < $@.$$$$ > $@; \
	 rm -f $@.$$$$
include $(DEPS)

endif

.PHONY: all