os-tutorial/14-checkpoint/Makefile

C_SOURCES = $(wildcard kernel/*.c drivers/*.c)
HEADERS = $(wildcard kernel/*.h drivers/*.h)
OBJ = ${C_SOURCES:.c=.o}

# Change this if your cross-compiler is somewhere else
CC = /usr/local/i386elfgcc/bin/i386-elf-gcc
GDB = /usr/local/i386elfgcc/bin/i386-elf-gdb
# -g: Use debugging symbols
CFLAGS = -g

# First rule is run by default
os-image.bin: boot/bootsect.bin kernel.bin
	cat $^ > os-image.bin

kernel.bin: kernel.elf
	i386-elf-ld -o $@ -Ttext 0x1000 $^ --oformat binary

run: os-image.bin
	qemu-system-i386 -fda os-image.bin

debug: os-image.bin kernel.elf
	qemu-system-i386 -s -fda os-image.bin &
	${GDB} -ex "target remote localhost:1234" -ex "symbol-file kernel.elf"

# To build the kernel: make all objects first
kernel.elf: boot/kernel_entry.o ${OBJ}
	i386-elf-ld -o $@ -Ttext 0x1000 $^ 

# To make an object, always compile from its .c
%.o: %.c ${HEADERS}
	${CC} ${CFLAGS} -ffreestanding -c $< -o $@

# Object files from asm files
%.o: %.asm
	nasm $< -f elf -o $@

%.bin: %.asm
	nasm $< -f bin -o $@


clean:
	rm -rf *.bin *.dis *.o os-image.bin *.elf
	rm -rf kernel/*.o boot/*.bin drivers/*.o