From 864f63792d06e71f224e903c937d7d03bbab31ba Mon Sep 17 00:00:00 2001
From: Louie Lu <louie.lu@hopebaytech.com>
Date: Mon, 24 Oct 2016 17:51:08 +0800
Subject: [PATCH] Makefile: detect lua version is less then 5.3 for bitop

Testing on Lua 5.3.2, when compiling, it will throw an exception
"jit-x86.dasc:4: error: cannot load module:
 dynasm/dasm_x86.lua:31: module 'bit' not found"

According to Lua Bitop website, Bitop only support Lua 5.1/5.2.
(http://bitop.luajit.org/)

"Lua BitOp is a C extension module for Lua 5.1/5.2
which adds bitwise operations on numbers."

When detect lua version is greater then 5.2, it will change
specific lua version to 5.2.
---
 Makefile | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Makefile b/Makefile
index 116e98a..d7bc664 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,16 @@ BIN = interpreter \
 CROSS_COMPILE = arm-linux-gnueabihf-
 QEMU_ARM = qemu-arm -L /usr/arm-linux-gnueabihf
 LUA = lua
+LUAVERSION_MAJOR = $(shell $(LUA) -v | cut -d' ' -f2 | cut -d'.' -f1)
+LUAVERSION_MINOR = $(shell $(LUA) -v | cut -d' ' -f2 | cut -d'.' -f2)
+
+# Checking lua version is less then 5.3.
+# if not, change to lua 5.2
+ifeq ($(LUAVERSION_MAJOR), 5)
+ifeq ($(shell test $(LUAVERSION_MINOR) -gt 2; echo $$?), 0)
+	LUA = lua5.2
+endif
+endif
 
 all: $(BIN)