[Makefile] Easier adding of sources

Author: Gregwar

build-targets.mk

@@ -1,5 +1,8 @@
-# main project target
-$(BUILD_PATH)/main.o: $(SRCROOT)/main.cpp
+# Sources to compile
+SRC_FILES = main.cpp
+OBJ_FILES = $(addprefix $(BUILD_PATH)/,$(SRC_FILES:.cpp=.o))
+
+$(BUILD_PATH)/%.o: %.cpp
 	$(SILENT_CXX) $(CXX) $(CFLAGS) $(CXXFLAGS) $(LIBMAPLE_INCLUDES) $(WIRISH_INCLUDES) -o $@ -c $< 
 
 $(BUILD_PATH)/libmaple.a: $(BUILDDIRS) $(TGT_BIN)
@@ -10,7 +13,7 @@ library: $(BUILD_PATH)/libmaple.a
 
 .PHONY: library
 
-$(BUILD_PATH)/$(BOARD).elf: $(BUILDDIRS) $(TGT_BIN) $(BUILD_PATH)/main.o
+$(BUILD_PATH)/$(BOARD).elf: $(BUILDDIRS) $(TGT_BIN) $(OBJ_FILES)
 	$(SILENT_LD) $(CXX) $(LDFLAGS) -o $@ $(TGT_BIN) $(BUILD_PATH)/main.o -Wl,-Map,$(BUILD_PATH)/$(BOARD).map
 
 $(BUILD_PATH)/$(BOARD).bin: $(BUILD_PATH)/$(BOARD).elf