...

makefile

@@ -1,8 +1,10 @@
-CC = i386-elf-gcc
-LD = i386-elf-ld
+CC = x86_64-elf-gcc
+LD = x86_64-elf-ld
+AS = nasm
 
-CFLAGS 	= -m32 -ffreestanding -fno-builtin -Wall -Wextra -Wshadow -std=c23
-LDFLAGS = 
+CFLAGS 	= -m64 -ffreestanding -fno-builtin -Wall -Wextra -Wshadow -std=c23 -g
+LDFLAGS	= -g
+ASFLAGS	= -f elf64 -g -F dwarf
 
 SRC_C   := src/kernel.c src/string.c src/vga.c
 SRC_ASM := src/boot.asm
@@ -11,9 +13,6 @@ OBJ_C   := $(SRC_C:src/%.c=.build/%.o)
 OBJ_ASM := $(SRC_ASM:src/%.asm=.build/%.o)
 OBJS    := $(OBJ_C) $(OBJ_ASM)
 
-kernel: .build/kernel
-	@echo "Kernel created at '.build/kernel'"
-
 iso: .build/nub-os.iso
 	@echo "ISO created at '.build/nub-os.iso'"
 
@@ -30,10 +29,10 @@ build-dir:
 	grub-mkrescue -o .build/nub-os.iso .build/nub-os/
 
 .build/kernel: $(OBJS) | linker.ld
-	$(LD) $(LDFLAGS) -m elf_i386 -T linker.ld -o $@ $^
+	$(LD) $(LDFLAGS) -T linker.ld -o $@ $^
 
 .build/%.o: src/%.c | build-dir
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 .build/%.o: src/%.asm | build-dir
-	nasm -f elf32 -o $@ $<
+	$(AS) $(ASFLAGS) -o $@ $<