Makefile

OBJECTS = loader.o kernel/main.o
CC = gcc
CFLAGS = -m64 -fno-stack-protector \
    -O2 -Wall -Wextra -Werror -c
LDFLAGS = -T link.ld -m elf_x86_64
AS = nasm
ASFLAGS = -f elf64

all: kernel.elf

kernel.elf: $(OBJECTS)
    ld $(LDFLAGS) $(OBJECTS) -o kernel.elf -L/usr/lib/x86_64-linux-gnu -lc

os.iso: kernel.elf
    cp kernel.elf iso/boot/kernel.elf
    genisoimage -R                      \
        -b boot/grub/stage2_eltorito    \
        -no-emul-boot                   \
        -boot-load-size 4               \
        -A mdos                         \
        -input-charset utf8             \
        -quiet                          \
        -boot-info-table                \
        -o os.iso                       \
        iso

run: os.iso
    qemu-system-x86_64 -cdrom os.iso -m 512

%.o: %.s
    $(AS) $(ASFLAGS) $< -o $@

%.o: %.c
    $(CC) $(CFLAGS)  $< -o $@

clean:
    rm -rf *.o kernel/*.o kernel.elf os.iso