ifeq (, $(__RIOTBUILD_FLAG))
    $(error You cannot build a module on its own. Use "make" in your application's directory instead.)
endif

unexport DIRS
DIRS := $(abspath ${DIRS})

MODULE ?= $(shell basename $(CURDIR))

.PHONY: all ${DIRS:%=ALL--%} ${DIRS:%=CLEAN--%}

all: $(BINDIR)$(MODULE).a ..nothing

..nothing:
	@:

clean:: ${DIRS:%=CLEAN--%}

${DIRS:%=ALL--%}:
	"$(MAKE)" -C ${@:ALL--%=%}

${DIRS:%=CLEAN--%}:
	"$(MAKE)" -C ${@:CLEAN--%=%} clean

ASMSRC = $(wildcard *.s)
ASSMSRC = $(wildcard *.S)
ASMOBJ = $(ASMSRC:%.s=$(BINDIR)$(MODULE)/%.o)
ASMOBJ += $(ASSMSRC:%.S=$(BINDIR)$(MODULE)/%.o)

ifeq ($(strip $(SRC)),)
	SRC = $(wildcard *.c)
endif

ifeq ($(strip $(SRCXX)),)
	SRCXX = $(wildcard *.cpp)
endif

OBJC = $(SRC:%.c=$(BINDIR)$(MODULE)/%.o)
OBJCXX = $(SRCXX:%.cpp=$(BINDIR)$(MODULE)/%.o)

OBJ = $(OBJC)
OBJ += $(OBJCXX)

DEP = $(SRC:%.c=$(BINDIR)$(MODULE)/%.d)
DEP += $(SRCXX:%.cpp=$(BINDIR)$(MODULE)/%.d)

$(BINDIR)$(MODULE)/:
	$(AD)mkdir -p $@

$(BINDIR)$(MODULE).a: $(OBJ) ${DIRS:%=ALL--%} $(BINDIR)$(MODULE)/
	$(AD)$(AR) -rcs $@ $(OBJ)

CXXFLAGS = $(filter-out $(CXXUWFLAGS), $(CFLAGS)) $(CXXEXFLAGS)

# compile and generate dependency info

$(BINDIR)$(MODULE)/%.o: %.c $(BINDIR)$(MODULE)/
	$(AD)$(CC) $(CFLAGS) $(INCLUDES) -MD -MP -c -o $@ $(abspath $<)

$(BINDIR)$(MODULE)/%.o: %.cpp $(BINDIR)$(MODULE)/
	$(AD)$(CXX) $(CXXFLAGS) $(INCLUDES) -MD -MP -c -o $@ $(abspath $<)

$(BINDIR)$(MODULE)/%.o: %.s $(BINDIR)$(MODULE)/
	$(AD)$(AS) $(ASFLAGS) -o $@ $(abspath $<)

$(BINDIR)$(MODULE)/%.o: %.S $(BINDIR)$(MODULE)/
	$(AD)$(CC) $(CFLAGS) $(INCLUDES) -MD -MP -c -o $@ $(abspath $<)

# pull in dependency info for *existing* .o files
# deleted header files will be silently ignored
-include $(OBJ:.o=.d)