seperate avr gcc and g++ compilers

Makefile

@@ -1,5 +1,5 @@
-ARDUINO_DIR?="external/ArduinoCore-avr"
-NANOPB_DIR?="external/nanopb"
+ARDUINO_DIR?=external/ArduinoCore-avr
+NANOPB_DIR?=external/nanopb
 
 CC=avr-gcc
 CXX=avr-g++
@@ -10,6 +10,22 @@ OUT=./bin/
 NAME=collar
 
 CFLAGS?=-Datmega328p\
+				-Dmega328p\
+				-mmcu=atmega328p\
+				-Wl,--gc-sections\
+				-DF_CPU=16000000L\
+				-DARDUINO=200\
+				-DARDUINO_AVR_NANO\
+				-DARDUINO_ARCH_AVR\
+				-Os\
+				-ffunction-sections\
+				-fdata-sections\
+				-MMD\
+				-flto\
+				-fno-fat-lto-objects\
+		  	-fuse-linker-plugin
+
+CXXFLAGS?=-Datmega328p\
 				-Dmega328p\
 				-mmcu=atmega328p\
 				-Wl,--gc-sections\
@@ -43,6 +59,10 @@ SRC_FILES?=./$(ARDUINO_DIR)/cores/arduino/main.cpp\
 					 ./$(ARDUINO_DIR)/cores/arduino/WInterrupts.c\
 					 ./$(ARDUINO_DIR)/cores/arduino/hooks.c\
 					 ./$(ARDUINO_DIR)/cores/arduino/wiring.c\
+					 ./$(NANOPB_DIR)/pb_encode.c\
+					 ./$(NANOPB_DIR)/pb_decode.c\
+					 ./$(NANOPB_DIR)/pb_common.c\
+					 ./protobuf/gateway/message.pb.c\
            ./$(ARDUINO_DIR)/cores/arduino/HardwareSerial.cpp\
            ./$(ARDUINO_DIR)/cores/arduino/HardwareSerial0.cpp\
            ./$(ARDUINO_DIR)/cores/arduino/HardwareSerial1.cpp\
@@ -58,11 +78,7 @@ SRC_FILES?=./$(ARDUINO_DIR)/cores/arduino/main.cpp\
 					 ./libraries/arduino-LoRa/src/LoRa.cpp\
 					 ./libraries/TinyGPSPlus/src/TinyGPS++.cpp\
            ./libraries/TinyLoRa/TinyLoRa.cpp\
-           ./libraries/arduino-base64/Base64.cpp\
-					 ./$(NANOPB_DIR)/pb_encode.c\
-					 ./$(NANOPB_DIR)/pb_decode.c\
-					 ./$(NANOPB_DIR)/pb_common.c\
-					 ./protobuf/gateway/message.pb.c
+           ./libraries/arduino-base64/Base64.cpp
 
 SRC_FILES_COMMON?=\
 					 ./$(NANOPB_DIR)/pb_encode.c\
@@ -70,14 +86,25 @@ SRC_FILES_COMMON?=\
 					 ./$(NANOPB_DIR)/pb_common.c\
 					 ./protobuf/gateway/message.pb.c
 
+# Make targets for each source file
+OBJS := $(SRC_FILES:%=./bin/%.o)
+OBJDIRS := $(SRC_FILES:%=./bin/%)
+
 build: $(OUT)$(NAME)
 
+$(OBJDIRS):
+	mkdir -p $(shell dirname $@)
+$(OUT)%.cpp.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $(INC_DIRS) -o $@ $< 
+$(OUT)%.c.o: %.c
+	$(CC) $(CFLAGS) -c $(INC_DIRS) -o $@ $< 
+
 $(OUT)$(NAME): $(OUT)$(NAME).elf
 	$(OBJCOPY) -R .eeprom -O ihex $(OUT)$(NAME).elf $(OUT)$(NAME).hex
 $(OUT)eep.hex: $(OUT)$(NAME).elf
 	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $(OUT)$(NAME).elf $(OUT)eep.hex
-$(OUT)$(NAME).elf: protobufg bin
-	$(CC) $(CFLAGS) -o $(OUT)$(NAME).elf collar.cpp $(INC_DIRS) $(SRC_FILES) 
+$(OUT)$(NAME).elf: protobufg bin $(OBJDIRS) $(OBJS)
+	$(CC) $(CFLAGS) -o $(OUT)$(NAME).elf collar.cpp $(INC_DIRS) $(OBJS) 
 
 test:
 	g++ -o $(OUT)test prototest.cpp $(INC_DIRS) $(SRC_FILES_COMMON)