CC = i686-elf-gcc
AS = nasm

BUILDDIR := build
CFLAGS   := -ffreestanding -Wall -Wextra -Werror
LDFLAGS  := -ffreestanding -nostdlib -lgcc -T kernel/kernel.ld

KSRC := $(wildcard kernel/*.asm kernel/*.c)
KOBJ := $(addprefix $(BUILDDIR)/, \
		$(notdir \
		$(patsubst %.asm,%.o, $(patsubst %.c,%.o, $(KSRC)))))
KIMG := kernel.bin

$(BUILDDIR)/$(KIMG): $(KOBJ)
	$(CC) $^ -o $@ $(LDFLAGS)
$(BUILDDIR)/%.o: */%.asm
	$(AS) -felf32 $^ -o $@
$(BUILDDIR)/%.o: */%.c
	$(CC) $(CFLAGS) -c $^ -o $@

kernel: $(BUILDDIR)/$(KIMG)

$(BUILDDIR)/Hazel.iso: kernel
	cp $(BUILDDIR)/kernel.bin boot/kernel.bin
	grub-mkrescue -o  $(BUILDDIR)/Hazel.iso .
iso: $(BUILDDIR)/Hazel.iso

qemu: iso
	qemu-system-i386 -cdrom $(BUILDDIR)/Hazel.iso

clean:
	rm build/* boot/*.bin