Fix Lua examples for running under Lua 5.2

Includes cherry picking parts of
ce2760f77e

Examples/lua/dual/dual.cpp

@@ -36,6 +36,10 @@ extern "C" int luaopen_example2(lua_State*L);
 #define DEBUG2(X,Y) {printf(X,Y);fflush(stdout);}
 #define DEBUG3(X,Y,Z) {printf(X,Y,Z);fflush(stdout);}
 
+#if LUA_VERSION_NUM > 501
+#define lua_open luaL_newstate
+#endif
+
 void testModule(lua_State *L)
 {
   swig_type_info *pTypeInfo=0,*pTypeInfo2=0;

Examples/lua/embed/Makefile

@@ -4,6 +4,7 @@ TARGET     = embed
 SRCS       = example.c
 INTERFACE  = example.i
 LUA_INTERP = embed.c
+LIBS       = -lm
 
 # this is a little different to normal as we have our own special interpreter
 # which we want to static link
@@ -12,7 +13,7 @@ check: build
 
 build:
 	$(MAKE) -f $(TOP)/Makefile $(SWIGLIB) SRCS='$(SRCS)' SWIG='$(SWIG)' \
-	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='example.i' LUA_INTERP='$(LUA_INTERP)' lua_static
+	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' LIBS='$(LIBS)' INTERFACE='example.i' LUA_INTERP='$(LUA_INTERP)' lua_static
 
 clean:
 	$(MAKE) -f $(TOP)/Makefile lua_clean

Examples/lua/embed/embed.c

@@ -18,6 +18,10 @@ We will be using the luaL_dostring()/lua_dostring() function to call into lua
 #include <lauxlib.h>
 #include <lualib.h>
 
+#if LUA_VERSION_NUM > 501
+#define lua_open luaL_newstate
+#endif
+
 /* the SWIG wrappered library */
 extern int luaopen_example(lua_State*L);
 

Examples/lua/embed2/Makefile

@@ -4,6 +4,7 @@ TARGET     = embed2
 SRCS       = example.c
 INTERFACE  = example.i
 LUA_INTERP = embed2.c
+LIBS       = -lm
 
 # this is a little different to normal as we have our own special interpreter
 # which we want to static link
@@ -12,7 +13,7 @@ check: build
 
 build:
 	$(MAKE) -f $(TOP)/Makefile $(SWIGLIB) SRCS='$(SRCS)' SWIG='$(SWIG)' \
-	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='example.i' LUA_INTERP='$(LUA_INTERP)' lua_static
+	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' LIBS='$(LIBS)' INTERFACE='example.i' LUA_INTERP='$(LUA_INTERP)' lua_static
 
 clean:
 	$(MAKE) -f $(TOP)/Makefile lua_clean

Examples/lua/embed2/embed2.c

@@ -31,6 +31,9 @@ We will be using the luaL_dostring()/lua_dostring() function to call into lua
 #include <stdarg.h>
 #include <string.h>
 
+#if LUA_VERSION_NUM > 501
+#define lua_open luaL_newstate
+#endif
 
 /* the SWIG wrappered library */
 extern int luaopen_example(lua_State*L);
@@ -46,8 +49,7 @@ int call_add(lua_State *L,int a,int b,int* res) {
   push a, push b, call 'add' check & return res
   */
   top=lua_gettop(L);  /* for later */
-  lua_pushstring(L, "add");                                  /* function name */
+  lua_getglobal(L, "add");               /* function to be called */
-  lua_gettable(L, LUA_GLOBALSINDEX);               /* function to be called */
   if (!lua_isfunction(L,-1)) {
     printf("[C] error: cannot find function 'add'\n");
     lua_settop(L,top);  // reset

Examples/lua/embed3/embed3.cpp

@@ -27,6 +27,10 @@ extern "C" {
 #include <lualib.h>
 }
 
+#if LUA_VERSION_NUM > 501
+#define lua_open luaL_newstate
+#endif
+
 /* The SWIG external runtime is generated by using.
 swig -lua -externalruntime swigluarun.h
 It contains useful function used by SWIG in its wrappering
@@ -65,8 +69,7 @@ int call_onEvent(lua_State *L, Event e) {
   push a, push b, call 'add' check & return res
   */
   top = lua_gettop(L);  /* for later */
-  lua_pushstring(L, "onEvent");                                  /* function name */
+  lua_getglobal(L, "onEvent");               /* function to be called */
-  lua_gettable(L, LUA_GLOBALSINDEX);               /* function to be called */
   if (!lua_isfunction(L, -1)) {
     printf("[C++] error: cannot find function 'OnEvent'\n");
     lua_settop(L, top);  // reset