Makefile

CC 	    := x86_64-elf-gcc
CFLAGS 	:= -c -m64 -mcmodel=kernel -ffreestanding -nostdlib -mno-red-zone -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow -Isrc/include -Isrc/arch/x86_64/include
AS	    := nasm
AFLAGS	:= -felf64
LD	    := x86_64-elf-ld
LFLAGS	:= -nostdlib -z nodefaultlib -z max-page-size=0x1000

kernel_source_files := $(shell find src/kernel -name *.c)
kernel_object_files := $(patsubst src/kernel/%.c, build/kernel/%.o, $(kernel_source_files))

x86_64_c_source_files := $(shell find src/arch/x86_64 -name *.c)
x86_64_c_object_files := $(patsubst src/arch/x86_64/%.c, build/x86_64/%.o, $(x86_64_c_source_files))

x86_64_asm_source_files := $(shell find src/arch/x86_64 -name *.asm)
x86_64_asm_object_files := $(patsubst src/arch/x86_64/%.asm, build/x86_64/%.o, $(x86_64_asm_source_files))

x86_64_object_files := $(x86_64_c_object_files) $(x86_64_asm_object_files)

$(kernel_object_files): build/kernel/%.o : src/kernel/%.c
	mkdir -p $(dir $@) && \
	$(CC) $(CFLAGS) $(patsubst build/kernel/%.o, src/kernel/%.c, $@) -o $@

$(x86_64_c_object_files): build/x86_64/%.o : src/arch/x86_64/%.c
	mkdir -p $(dir $@) && \
	$(CC) $(CFLAGS) $(patsubst build/x86_64/%.o, src/arch/x86_64/%.c, $@) -o $@

$(x86_64_asm_object_files): build/x86_64/%.o : src/arch/x86_64/%.asm
	mkdir -p $(dir $@) && \
	$(AS) $(AFLAGS) $(patsubst build/x86_64/%.o, src/arch/x86_64/%.asm, $@) -o $@

.PHONY: build-x86_64
build-x86_64: $(kernel_object_files) $(x86_64_object_files)
	mkdir -p dist/x86_64 && \
	$(LD) $(LFLAGS) -o dist/x86_64/kernel.bin -T targets/x86_64/linker.ld $(kernel_object_files) $(x86_64_object_files) && \
	cp dist/x86_64/kernel.bin targets/x86_64/iso/boot/kernel.bin && \
	grub-mkrescue /usr/lib/grub/i386-pc -o dist/x86_64/kernel.iso targets/x86_64/iso

clean:
	rm -Rf ./dist
	rm -Rf ./build