Merge pull request MarlinFirmware#138 from triffid/fix-makefile

make should rebuild if configuration or Makefile is changed

Marlin/Makefile

@@ -112,8 +112,8 @@ CDEFS = -DF_CPU=$(F_CPU)
 CXXDEFS = -DF_CPU=$(F_CPU)
 
 # Add all the source directories as include directories too
-CINCS = ${patsubst %,-I%,${subst :, ,${VPATH}}}
-CXXINCS = ${patsubst %,-I%,${subst :, ,${VPATH}}}
+CINCS = ${addprefix -I ,${VPATH}}
+CXXINCS = ${addprefix -I ,${VPATH}}
 
 # Compiler flag to set the C Standard level.
 # c89   - "ANSI" C
@@ -185,7 +185,7 @@ applet:
 # ..and the .o depends from the .cpp
 #applet/%.o: applet/%.cpp
 
-applet/%.cpp: %.pde
+applet/%.cpp: %.pde $(MAKEFILE)
 # Here is the "preprocessing".
 # It creates a .cpp file based with the same name as the .pde file.
 # On top of the new .cpp file comes the WProgram.h header.
@@ -264,16 +264,11 @@ applet/$(TARGET).elf: applet/$(TARGET).cpp applet/core.a Configuration.h
 applet/core.a: $(OBJ)
 	@for i in $(OBJ); do echo "  AR    $$i"; $(AR) rcs applet/core.a $$i; done
 
-applet/%.o: %.c
+applet/%.o: %.c Configuration.h Configuration_adv.h $(MAKEFILE)
 	@echo "  CC    $@"
 	@$(CC) -MMD -c $(ALL_CFLAGS) $< -o $@
 
-applet/%.o: %.cpp
-	@echo "  CXX   $@"
-	@$(CXX) -MMD -c $(ALL_CXXFLAGS) $< -o $@
-
-# special rule for autogenerated files...
-applet/%.o: applet/%.cpp
+applet/%.o: %.cpp Configuration.h Configuration_adv.h $(MAKEFILE)
 	@echo "  CXX   $@"
 	@$(CXX) -MMD -c $(ALL_CXXFLAGS) $< -o $@