Compile rust project in Makefile

Makefile

@@ -16,18 +16,20 @@ arch ?= x86_64
 kernel := build/kernel-$(arch).bin
 iso := build/os-$(arch).iso
 
+rust_os := target/debug/libblog_os.a
 linker_script := src/arch/$(arch)/linker.ld
 grub_cfg := src/arch/$(arch)/grub.cfg
 assembly_source_files := $(wildcard src/arch/$(arch)/*.asm)
 assembly_object_files := $(patsubst src/arch/$(arch)/%.asm, \
 	build/arch/$(arch)/%.o, $(assembly_source_files))
 
-.PHONY: all clean run iso
+.PHONY: all clean run iso cargo
 
 all: $(kernel)
 
 clean:
-	@rm -r build
+	@cargo clean
+	@rm -rf build
 
 run: $(iso)
 	@qemu-system-x86_64 -hda $(iso)
@@ -41,8 +43,11 @@ $(iso): $(kernel)
 	@grub-mkrescue -o $(iso) build/isofiles 2> /dev/null
 	@rm -r build/isofiles
 
-$(kernel): $(assembly_object_files) $(linker_script)
-	@ld -n -T $(linker_script) -o $(kernel) $(assembly_object_files)
+$(kernel): cargo $(rust_os) $(assembly_object_files) $(linker_script)
+	@ld -n -T $(linker_script) -o $(kernel) $(assembly_object_files) $(rust_os)
+
+cargo:
+	@cargo build
 
 # compile assembly files
 build/arch/$(arch)/%.o: src/arch/$(arch)/%.asm