Add luaconf.h LUA_REMOVE_COLLECTGARBAGE to drop collectgarbage and gc…

…info

For systems with a lack of program space

src/lua/lbaselib.c

@@ -185,6 +185,9 @@ static int luaB_rawset (lua_State *L) {
 }
 
 
+#ifndef LUA_REMOVE_COLLECTGARBAGE
+
+
 static int luaB_gcinfo (lua_State *L) {
   lua_pushinteger(L, lua_getgccount(L));
   return 1;
@@ -218,6 +221,9 @@ static int luaB_collectgarbage (lua_State *L) {
 }
 
 
+#endif	/* LUA_REMOVE_COLLECTGARBAGE */
+
+
 static int luaB_type (lua_State *L) {
   luaL_checkany(L, 1);
   lua_pushstring(L, luaL_typename(L, 1));
@@ -447,12 +453,22 @@ static int luaB_newproxy (lua_State *L) {
   return 1;
 }
 
+#ifndef LUA_REMOVE_COLLECTGARBAGE
+# define COLLECTGARBAGE \
+  {LSTRKEY("collectgarbage"), LFUNCVAL(luaB_collectgarbage)},
+# define GCINFO \
+  {LSTRKEY("gcinfo"), LFUNCVAL(luaB_gcinfo)},
+#else
+# define COLLECTGARBAGE /**/
+# define GCINFO /**/
+#endif
+
 #define LUA_BASELIB_FUNCLIST\
   {LSTRKEY("assert"), LFUNCVAL(luaB_assert)},\
-  {LSTRKEY("collectgarbage"), LFUNCVAL(luaB_collectgarbage)},\
+  COLLECTGARBAGE\
   {LSTRKEY("dofile"), LFUNCVAL(luaB_dofile)},\
   {LSTRKEY("error"), LFUNCVAL(luaB_error)},\
-  {LSTRKEY("gcinfo"), LFUNCVAL(luaB_gcinfo)},\
+  GCINFO\
   {LSTRKEY("getfenv"), LFUNCVAL(luaB_getfenv)},\
   {LSTRKEY("getmetatable"), LFUNCVAL(luaB_getmetatable)},\
   {LSTRKEY("loadfile"), LFUNCVAL(luaB_loadfile)},\

src/lua/luaconf.h

@@ -26,6 +26,7 @@
 **    which is always needed when compiling the cross-compiler
 @@ LUA_REMOVE_UNDUMP removes the undump mechanism,
 **    which is needed to be able to load compiled bytecode from *.lc files.
+@@ LUA_REMOVE_COLLECTGARBAGE removes the collectgarbage() and gcinfo() functions
 */ 
 
 #ifdef LUA_CROSS_COMPILER