x86_64 added

x86_64/makefile

@@ -0,0 +1,21 @@
+CC = gcc
+AS = nasm
+LD = ld
+
+.PHONY: all clean
+
+all: build 0_basic
+
+clean:
+	-rm -r build
+	-rm 0_basic
+
+build:
+	mkdir build
+
+build/%.o: %.asm
+	$(AS) -g -f elf64 $< -o $@
+
+0_basic: build/0_basic.o
+	$(LD) $< -o $@
+