Makefile.default

## Common Makefile rules

### defaults and output ########################################################

CHECK		?= sparse

ifneq ($(V),1)
Q		:= @
NULL		:= 2>/dev/null
endif

### build dir ##################################################################

BUILD_DIR	?= build
VERSION		:= $(shell git describe --tags --dirty=+ 2>/dev/null)

# function for removing duplicates in a list
remduplicates = $(strip $(if $1,$(firstword $1) $(call remduplicates,$(filter-out $(firstword $1),$1))))

OBJS		= $(addprefix $(BUILD_DIR)/, $(SRC:.c=.o))
OBJ_DIRS	:= $(call remduplicates, $(dir $(OBJS)))

### common flags ###############################################################

DEFS		+= -DVERSION=\"$(VERSION)\"

CPPFLAGS	+= -MD

CFLAGS		+= $(INCLUDES)
CPPFLAGS	+= $(DEFS)

ifeq ($(DEBUG),1)
CFLAGS		+= -DDEBUG=1
endif

### targets ####################################################################

.PHONY: force

# common targets
bin: $(BUILD_DIR)/$(NAME)
lib-static: $(BUILD_DIR)/$(NAME).a
lib-dynamic: $(BUILD_DIR)/$(NAME).so

dir: $(OBJ_DIRS)
	@printf "  DIR     $(BUILD_DIR)\n"

$(OBJ_DIRS):
	$(Q)mkdir -p $@

# binary
$(BUILD_DIR)/$(NAME): $(OBJS)
	@printf "  LD      $@\n"
	$(Q)$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)

# static library
$(BUILD_DIR)/$(NAME).a: $(OBJS)
	@printf "  AR      $@\n"
	$(Q)$(AR) rcs $@ $(OBJS)

# dynamic library
$(BUILD_DIR)/$(NAME).so: $(OBJS)
	@printf "  LD      $@\n"
	$(Q)$(CC) $(LDFLAGS) -shared -Wl,-soname,$@.1 -o $@ $(OBJS) $(LIBS)
	$(Q)-ln -sfn $(NAME).so $@.1

$(BUILD_DIR)/%.o: %.c
	@printf "  CC      $(*).c\n"
	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $(BUILD_DIR)/$(*).o -c $(*).c

$(BUILD_DIR)/%.o: %.cpp
	@printf "  CXX     $(*).cpp\n"
	$(Q)$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $(BUILD_DIR)/$(*).o -c $(*).cpp

# build flags
$(BUILD_DIR)/buildflags: force
	@#@printf "  FLAGS\n"
	$(Q)mkdir -p $(BUILD_DIR)
	$(Q)echo '$(CFLAGS) $(CPPFLAGS)' | cmp -s - $@ || echo '$(CFLAGS) $(CPPFLAGS)' > $@

$(OBJS): dir $(BUILD_DIR)/buildflags

check: $(filter-out libs%,$(SRC))
	@printf "  CHECK $^\n"
	$(Q)$(CHECK) $(CFLAGS) $(CPPFLAGS) $(CHECK_FLAGS) $^

clean: $(EXTRA_CLEAN)
	@printf "  CLEAN\n"
	$(Q)-rm -f $(OBJS) $(OBJS:.o=.d) *~
	$(Q)-rm -f $(NAME) $(NAME).a $(NAME).so*
	$(Q)-rm -f .objdeps.mk
    ifneq (.,$(BUILD_DIR))
    ifneq (..,$(BUILD_DIR))
	$(Q)$(RM) -r $(BUILD_DIR)
    endif
    endif

-include $(OBJS:.o=.d)