handle own libraries

Makefile

@@ -21,10 +21,13 @@ Q := @
 endif
 
 # the final binary name (without extension)
-BINARY = main
+BINARY = firmware
 
 # source files
-OBJS += $(BINARY).o
+LIBS = lib
+CSRC = $(wildcard *.c)
+CSRC += $(foreach LIB,$(LIBS),$(wildcard $(LIB)/*.c))
+OBJ = $(patsubst %.c,%.o,$(CSRC))
 
 # executables
 PREFIX ?= arm-none-eabi
@@ -55,11 +58,12 @@ DEFS += -DSTM32F1
 
 # C flags
 CFLAGS += -Os -g
-CFLAGS += -Wall -Wundef -Wextra -Wshadow -Wimplicit-function-declaration
+CFLAGS += -Wall -Werror -Wundef -Wextra -Wshadow -Wimplicit-function-declaration
 CFLAGS += -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
 CFLAGS += -fno-common -ffunction-sections -fdata-sections
 CFLAGS += -MD
-CFLAGS += -I$(INCLUDE_DIR) $(DEFS)
+CFLAGS += -I. -I$(INCLUDE_DIR) $(patsubst %,-I%,$(LIBS))
+CFLAGS += $(DEFS)
 
 # linker script
 LDSCRIPT = stm32f103x8-dfu.ld
@@ -67,6 +71,7 @@ LDSCRIPT = stm32f103x8-dfu.ld
 # linker flags
 LDFLAGS += --static -nostartfiles
 LDFLAGS += -L$(LIB_DIR)
+LDFLAGS += -I. $(patsubst %,-I%,$(LIBS))
 LDFLAGS += -T$(LDSCRIPT)
 LDFLAGS += -Wl,-Map=$(*).map
 LDFLAGS += -Wl,--gc-sections
@@ -123,9 +128,9 @@ list: $(BINARY).list
 %.map: %.elf
 	@# it's generated along with the elf
 
-%.elf: $(OBJS) $(LDSCRIPT) $(LIB_DIR)/lib$(LIBNAME).a
+%.elf: $(OBJ) $(LDSCRIPT) $(LIB_DIR)/lib$(LIBNAME).a
 	$(info compiling $(@))
-	$(Q)$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(@)
+	$(Q)$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJ) $(LDLIBS) -o $(@)
 
 %.o: %.c
 	@#printf "  CC      $(*).c\n"
@@ -154,5 +159,5 @@ flash-dfu: $(BINARY).bin
 	$(Q)dfu-util --device 1eaf:0003 --cfg 1 --intf 0 --alt 2 --reset --download $(<)
 
 .PHONY: clean elf bin hex srec list bootloader flash flash-swd flash-dfu
-
--include $(OBJS:.o=.d)
+.SECONDARY:
+-include $(OBJ:.o=.d)