CC = x86_64-elf-gcc
LD = x86_64-elf-ld
AS = nasm

CFLAGS 	= -m64 -ffreestanding -nostdinc -nostdlib -fno-builtin -Wall -Wextra -Wshadow -std=c11 -I src -I src/kernel -I src/arch -g
LDFLAGS	= -g
ASFLAGS	= -f elf64 -g -F dwarf

SRC_C	:= $(shell find src -name '*.c')
SRC_ASM := $(shell find src -name '*.asm')

OBJS := $(patsubst src/%.c, .build/%.o, $(SRC_C)) $(patsubst src/%.asm, .build/%.o, $(SRC_ASM))

iso: .build/nub-os.iso
	@echo "ISO created at '.build/nub-os.iso'"

clean:
	@rm -r .build 2>/dev/null || true

.build/nub-os.iso: .build/kernel/kernel grub.cfg
	mkdir -p .build/nub-os/boot/grub
	cp grub.cfg .build/nub-os/boot/grub
	cp .build/kernel/kernel .build/nub-os/boot/
	grub-mkrescue -o .build/nub-os.iso .build/nub-os/

.build/kernel/kernel: $(OBJS)
	$(LD) $(LDFLAGS) -T linker.ld -o $@ $^

.build/%.o: src/%.c
	@mkdir -p $(dir $@)
	$(CC) $(CFLAGS) -c -o $@ $<

.build/%.o: src/%.asm
	@mkdir -p $(dir $@)
	$(AS) $(ASFLAGS) -o $@ $<