From dc0306e3e4f823db7e7bd2d6d031041b58a35fef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cyril=20Bont=C3=A9?= <cyril.bonte@free.fr>
Date: Mon, 2 Mar 2015 00:08:40 +0100
Subject: [PATCH] MINOR: lua: add a compilation error message when compiled
 with an incompatible version

haproxy Lua support begins with Lua 5.2. In order to ease the diagnostic on
compilation error, a preprocessor error is added when an incompatible version
is used.

The compatibility is determined by the presence of LUA_VERSION_NUM and its
magic value (502 for Lua 5.2.x).
---
 src/hlua.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/hlua.c b/src/hlua.c
index 9ded473c1..51e149e71 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -4,6 +4,10 @@
 #include <lua.h>
 #include <lualib.h>
 
+#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 502
+#error "Requires Lua 5.2 or later."
+#endif
+
 #include <ebpttree.h>
 
 #include <common/cfgparse.h>