docs

makefile

@@ -1,34 +1,33 @@
-BUILDDIR=mkdir-build
-CC = i386-elf-gcc -ffreestanding -m32
+CC = i386-elf-gcc
+LD = i386-elf-ld
 
-iso: .build/ .build/nub-os.iso
+CFLAGS = -ffreestanding -m32
 
-.build/nub-os.iso: .build/kernel.bin
+all: .build/nub-os.iso
+
+clean:
+	@rm -r .build 2>/dev/null || true
+
+build-dir:
+	mkdir .build 2>/dev/null || true
+
+.build/nub-os.iso: build-dir .build/kernel.bin
 	mkdir -p .build/iso/boot/grub
 	cp grub.cfg .build/iso/boot/grub
 	cp .build/kernel.bin .build/iso/boot/
 	grub-mkrescue -o .build/nub-os.iso .build/iso/
 
-.build/kernel.bin: .build/entry.o .build/kernel.o .build/mem.o .build/print.o
-	i386-elf-ld -Ttext 0x100000 -o .build/kernel.bin .build/entry.o .build/kernel.o .build/mem.o .build/print.o
+.build/kernel.bin: build-dir .build/entry.o .build/kernel.o .build/mem.o .build/print.o
+	$(LD) -Ttext 0x100000 -o .build/kernel.bin .build/entry.o .build/kernel.o .build/mem.o .build/print.o
 
-.build/kernel.o: src/kernel.c
-	$(CC) -c -o .build/kernel.o src/kernel.c
+.build/kernel.o: build-dir src/kernel.c
+	$(CC) $(CFLAGS) -c -o .build/kernel.o src/kernel.c
 
-.build/mem.o: src/mem.c
-	$(CC) -c -o .build/mem.o src/mem.c
+.build/mem.o: build-dir src/mem.c
+	$(CC) $(CFLAGS) -c -o .build/mem.o src/mem.c
 
-.build/print.o: src/print.c
-	$(CC) -c -o .build/print.o src/print.c
+.build/print.o: build-dir src/print.c
+	$(CC) $(CFLAGS) -c -o .build/print.o src/print.c
 
-.build/entry.o: src/entry.asm
+.build/entry.o: build-dir src/entry.asm
 	nasm -f elf -o .build/entry.o src/entry.asm
-
-run: .build/nub-os.iso
-	qemu-system-x86_64 -cdrom .build/nub-os.iso
-
-.build/:
-	mkdir .build
-
-clean:
-	@rm -r .build 2>/dev/null || true