Makefile

# Makefile
CC      = gcc
CFLAGS  = -m32 -ffreestanding -fno-pic -fno-stack-protector -nostdlib \
          -O2 -Wall -Wextra -Wno-unused-parameter
AS      = nasm
ASFLAGS = -f elf32
LD      = ld
LDFLAGS = -m elf_i386 -T linker.ld

C_SRCS   = kernel.c vga.c pic.c idt.c keyboard.c memory.c gdt.c
ASM_SRCS = boot.asm isr.asm gdt.asm

C_OBJS   = $(C_SRCS:.c=.o)
ASM_OBJS = $(ASM_SRCS:.asm=_asm.o)   # _asm suffix avoids collision with .c objects
OBJS     = $(ASM_OBJS) $(C_OBJS)

# ── Targets ──────────────────────────────────────────────────────────────────
all: kernel.bin

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

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

kernel.bin: $(OBJS) linker.ld
	$(LD) $(LDFLAGS) -o $@ $(OBJS)
	@echo "Built kernel.bin"

iso: kernel.bin
	mkdir -p iso/boot/grub
	cp kernel.bin iso/boot/
	printf 'set timeout=0\nset default=0\nmenuentry "MyKernel" {\n  multiboot /boot/kernel.bin\n}\n' \
	    > iso/boot/grub/grub.cfg
	grub-mkrescue -o kernel.iso iso/ 2>/dev/null
	@echo "Created kernel.iso"

run: iso
	qemu-system-i386 -cdrom kernel.iso

clean:
	rm -rf *.o *.bin *.iso iso/

.PHONY: all iso run clean