SHELL = /bin/sh
.SUFFIXES:

CC     = avr-gcc
STRIP  = avr-strip

CPPFLAGS = -DNDEBUG
CFLAGS   = -Os

LDFLAGS  += -nostdlib -nostartfiles -flto
CPPFLAGS += -Iinclude
CFLAGS   += -std=gnu99 -MMD -MP
CFLAGS   += -Wall -Wextra -Wpedantic -Wno-pointer-arith

SRC := $(wildcard src/*.c src/*/*.c src/*/*/*.c src/*/*/*/*.c src/*/*/*/*/*.c src/*/*/*/*/*/*.c src/*/*/*/*/*/*/*.c src/*/*/*/*/*/*/*/*.c)
SRC += $(wildcard src/*.S src/*/*.S src/*/*/*.S src/*/*/*/*.S src/*/*/*/*/*.S src/*/*/*/*/*/*.S src/*/*/*/*/*/*/*.S src/*/*/*/*/*/*/*/*.S)
OBJ := $(SRC:%=obj/%.o)


.PHONY: all clean install-strip info
all: info bin/a.out
clean:; @-$(RM) -rv bin/ obj/
info:
	$(info CC:       $(CC))
	$(info CFLAGS:   $(CFLAGS))
	$(info CPPFLAGS: $(CPPFLAGS))
	$(info LDFLAGS:  $(LDFLAGS))
	$(info LDLIBS:   $(LDLIBS))

bin/a.out: $(OBJ)
	$(info [LD]	$(CC)	$@)
	@mkdir -p $(@D)
	@$(CC) -o $@ $^ $(LDFLAGS) $(LDLIBS)

bin/a.hex: bin/a.out
	$(info [STRIP]	$(STRIP)	$@)
	@$(STRIP) -o $@ $<

obj/%.o: %
	$(info [CC]	$(CC)	$@)
	@mkdir -p $(@D)
	@$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<

-include $(OBJ:%.o=%.d)