Makefile update for aarch64

src/Makefile

@@ -1,30 +1,34 @@
 CC = gcc
-STD_CFLAGS = -Wall -std=gnu99 -c -g -O3
+STD_CFLAGS = -Wall -std=gnu99 -c -g
 
 # Enable ARM-specific options only on ARM, and compilation of the app only on ARM
 UNAME := $(shell uname -m)
 
+# Determine Raspberry Pi version (if 2 or greater)
+RPI_VERSION := $(shell cat /proc/device-tree/model | grep -a -o "Raspberry\sPi\s[0-9]" | grep -o "[0-9]")
+
 # Determine the hardware platform and set propper compilation flags
 ifeq ($(UNAME), armv6l)
-	CFLAGS = $(STD_CFLAGS) -march=armv6 -mtune=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp -ffast-math -DRASPI=1
+	ARCH_CFLAGS = -march=armv6 -O3 -mtune=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp -ffast-math
 	TARGET = 1
-else ifeq ($(UNAME), armv7l)
-	RPI_VERSION := $(shell cat /proc/device-tree/model | grep -a -o "Raspberry\sPi\s[0-9]" | grep -o "[0-9]")
+else ifeq ($(shell expr $(RPI_VERSION) \> 1), 1)
+	ifeq ($(UNAME), armv7l)
+		ARCH_CFLAGS = -march=armv7-a -O3 -mtune=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp -ffast-math
+	else ifeq ($(UNAME), aarch64)
+		ARCH_CFLAGS = -march=armv8-a -O2 -pipe -fstack-protector-strong -fno-plt -ffast-math
+	endif
 	ifeq ($(shell expr $(RPI_VERSION) \>= 4), 1)
-		CFLAGS = $(STD_CFLAGS) -march=armv7-a -mtune=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp -ffast-math -DRASPI=4
+		TARGET = 4
 	else
-		CFLAGS = $(STD_CFLAGS) -march=armv7-a -mtune=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp -ffast-math -DRASPI=2
+		TARGET = 2
 	endif
-	TARGET = 1
-else ifeq ($(UNAME), aarch64)
-	CFLAGS = $(STD_CFLAGS) -march=armv8-a -O2 -pipe -fstack-protector-strong -fno-plt -ffast-math -DRASPI=2
-	TARGET = 1
 else
-	CFLAGS = $(STD_CFLAGS)
-	TARGET = 0
+	ARCH_CFLAGS = -O3
+	TARGET = other
 endif
+CFLAGS = $(STD_CFLAGS) $(ARCH_CFLAGS) -DRASPI=$(TARGET)
 
-ifeq ($(TARGET), 1)
+ifneq ($(TARGET), other)
 
 app: rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o mailbox.o
 	$(CC) -o pi_fm_rds rds.o waveforms.o mailbox.o pi_fm_rds.o fm_mpx.o control_pipe.o -lm -lsndfile