Make make rebuild on header changes

.gitignore

@@ -1,5 +1,6 @@
 *.o
 *.a
+*.d
 *.elf
 *.img
 *.lst

Makefile

@@ -19,7 +19,7 @@ all: $(TARGET)
 
 $(TARGET): $(OBJS) $(LIBS)
 	@echo "  LINK $@"
-	$(Q)$(CC) $(CFLAGS) -o $(TARGET).elf -Xlinker -Map=$(TARGET).map -T linker.ld -nostartfiles $(OBJS) $(LIBS)
+	$(Q)$(CXX) $(CFLAGS) -o $(TARGET).elf -Xlinker -Map=$(TARGET).map -T linker.ld -nostartfiles $(OBJS) $(LIBS)
 	$(Q)$(PREFIX)objdump -d $(TARGET).elf | $(PREFIX)c++filt > $(TARGET).lst
 	$(Q)$(PREFIX)objcopy $(TARGET).elf -O binary $(TARGET).img
 

Makefile.rules

@@ -12,6 +12,7 @@ PREFIX	?= arm-none-eabi-
 
 CC	= $(PREFIX)gcc
 CPP	= $(PREFIX)g++
+CXX	= $(PREFIX)g++
 AS	= $(CC)
 LD	= $(PREFIX)ld
 AR	= $(PREFIX)ar
@@ -39,10 +40,13 @@ else
 endif
 
 AFLAGS	 += $(ARCH)
-CFLAGS	 += $(ARCH) -Wall -Wno-unused-variable -Wno-unused-but-set-variable -Wno-psabi -fsigned-char -fno-builtin -Ofast -DNDEBUG
+CFLAGS	 += $(ARCH) -MMD -MP -Wall -Wno-unused-variable -Wno-unused-but-set-variable -Wno-psabi -fsigned-char -fno-builtin -Ofast -DNDEBUG
 CPPFLAGS := $(CFLAGS) $(CPPFLAGS) -fno-exceptions -fno-rtti -std=c++0x -Wno-write-strings
 CFLAGS	 += -fno-delete-null-pointer-checks -fdata-sections -ffunction-sections -u _printf_float -std=gnu99
 
+DEPENDS := $(patsubst %.o,%.d,$(OBJS))
+-include $(DEPENDS)
+
 .PHONY: clean
 
 %.o: %.S