From c659d21f0bc61d050d8bbec59a91251bf7986fb9 Mon Sep 17 00:00:00 2001
From: Imbus <>
Date: Wed, 3 Apr 2024 20:19:58 +0200
Subject: [PATCH] Makefile target for viewing assembly/symbol table and
 gitignore

---
 .gitignore |  2 ++
 makefile   | 18 ++++++++++--------
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/.gitignore b/.gitignore
index 060e848..8bc4fe2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 # Compiled object files
 *.o
 *.hex
+*.asm
+*.map
 
 # Executables
 *.exe
diff --git a/makefile b/makefile
index 0af2f5d..5056326 100644
--- a/makefile
+++ b/makefile
@@ -9,7 +9,7 @@ MCU = atmega328p
 QEMU_MACHINE_NAME = uno
 
 # Compiler flags
-CFLAGS = -std=c99 -Wall -Wno-array-bounds -mmcu=$(MCU) -DF_CPU=16000000UL -Os -g
+CFLAGS = -std=c99 -Wall -Wno-array-bounds -mmcu=$(MCU) -DF_CPU=16000000UL -Os -g -ffunction-sections -fdata-sections
 
 # Source files
 SRCS = main.c
@@ -29,7 +29,7 @@ all: $(TARGET).hex
 
 # Link object files
 $(TARGET).elf: $(OBJS)
-	$(CC) $(CFLAGS) $(OBJS) -o $(TARGET).elf
+	$(CC) $(CFLAGS) $(OBJS) -o $(TARGET).elf -Wl,--gc-sections
 
 # Convert ELF to HEX
 $(TARGET).hex: $(TARGET).elf
@@ -43,22 +43,24 @@ flash: $(TARGET).hex
 qemu: $(TARGET).elf
 	qemu-system-avr -machine $(QEMU_MACHINE_NAME) -bios $(TARGET).elf
 
-# View the generated assembly
-asm: $(TARGET).hex
-	avr-objdump -S $(TARGET).elf
-
 .PHONY: serial
 serial:
 	picocom -b 9600 /dev/ttyUSB0
 
+# Check so that we can talk to the MCU
 .PHONY: check
 check:
 	avrdude -p $(MCU) -c $(PROGRAMMER)
 
+# Generate symbol table and assembly
+extra: $(TARGET).elf
+	avr-objdump -t $(TARGET).elf > $(TARGET).map
+	avr-objdump -S $(TARGET).elf > $(TARGET).asm
+
 # Clean
 .PHONY: clean
 clean:
-	rm -f $(OBJS) $(TARGET).elf $(TARGET).hex
+	rm -f $(OBJS) $(TARGET).elf $(TARGET).hex $(TARGET).map $(TARGET).asm
 
 size: main.hex
-	avr-size --mcu=atmega328p main.hex
+	avr-size --mcu=$(MCU) main.hex