CC = i686-elf-gcc
AS = nasm

BUILDDIR := build
INCLUDEDIR := include

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

LSRC := $(wildcard lib/*.c)
LOBJ := $(addprefix $(BUILDDIR)/, \
		$(notdir \
		$(patsubst %.c,%.o, $(LSRC))))

ISO := Hazel.iso

CFLAGS    := -ffreestanding -Wall -Wextra -Werror -I $(INCLUDEDIR) -I lib
LDFLAGS   := -ffreestanding -nostdlib -lgcc -T kernel/kernel.ld
QEMUFLAGS := -cdrom $(BUILDDIR)/$(ISO) \
			 -s -d int \
	     -m 512M \
	     -serial stdio

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

kernel: $(BUILDDIR)/$(KIMG)

$(BUILDDIR)/$(ISO): kernel
	rm -f $(BUILDDIR)/$(ISO)
	cp $(BUILDDIR)/$(KIMG) boot/$(KIMG)
	grub-mkrescue -o  $(BUILDDIR)/$(ISO) .
iso: $(BUILDDIR)/$(ISO)

qemu: iso
	qemu-system-i386 $(QEMUFLAGS)
clean:
	rm -f build/* boot/*.bin