From 52f2d5bf131e8af78f57cff8c8f842a3f183fb82 Mon Sep 17 00:00:00 2001
From: Andrew Potter <agpotter@gmail.com>
Date: Sat, 11 Jan 2014 11:47:19 +0100
Subject: [PATCH] lua: fix detection of Lua 5.2 in autotools (patch #8270)

lua_open() isn't defined on Lua 5.2 on Fedora 20. luaL_newstate() is
used in lua 5.1+, but lua 5.0 only has lua_main(). This adds a test
using luaL_newstate() if the lua_main() test fails.
---
 ChangeLog    |  1 +
 configure.ac | 13 +++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 1bf8b0e63..c73bfbd08 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -98,6 +98,7 @@ http://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 * irc: add option irc.look.notice_welcome_tags
 * irc: add server option "default_msg_kick" to customize default kick/kickban
   message (task #12777)
+* lua: fix detection of Lua 5.2 in autotools (patch #8270)
 * lua: fix crash on calls to callbacks during load of script
 * python: fix load of scripts with python >= 3.3
 * relay: fix memory leak on unload of relay plugin
diff --git a/configure.ac b/configure.ac
index 7bac41004..a9e7895f1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -698,13 +698,18 @@ if test "x$enable_lua" = "xyes" ; then
     AC_MSG_CHECKING(for Lua compiling and linking)
     LUA_TEST=`LT=luatest.c ; echo "#include <lua.h>" > $LT;  echo "#include <lualib.h>" >> $LT; echo "int main() { luaopen_base((lua_State *)lua_open()); return 0; }" >> $LT ; $CC -Wall $LT -o $LT.out $LUA_CFLAGS $LUA_LFLAGS $CFLAGS $LDFLAGS 1>/dev/null 2>&1 ; echo $?; rm -f $LT $LT.out 1>/dev/null 2>&1`
     if test "x$LUA_TEST" != "x0" ; then
-        AC_MSG_RESULT(no)
-        AC_MSG_WARN([
+        LUA52_TEST=`LT=luatest.c ; echo "#include <lua.h>" > $LT;  echo "#include <lualib.h>" >> $LT; echo "int main() { luaopen_base((lua_State *)luaL_newstate()); return 0; }" >> $LT ; $CC -Wall $LT -o $LT.out $LUA_CFLAGS $LUA_LFLAGS $CFLAGS $LDFLAGS 1>/dev/null 2>&1 ; echo $?; rm -f $LT $LT.out 1>/dev/null 2>&1`
+        if test "x$LUA52_TEST" != "x0" ; then
+            AC_MSG_RESULT(no)
+            AC_MSG_WARN([
 *** Lua (>=5.0) headers and/or librairies couldn't be found on your system.
 *** Try to install liblua, liblualib and liblua-dev with your software package manager.
 *** WeeChat will be built without Lua support.])
-        enable_lua="no"
-        not_found="$not_found lua"
+            enable_lua="no"
+            not_found="$not_found lua"
+        else
+            AC_MSG_RESULT(yes)
+        fi
     else
         AC_MSG_RESULT(yes)
     fi