Lua integration problems

[MaximLaHaxim]

Okay, I want to integrate Lua into my program. I have downloaded LuaDist(which contains the C headers, tons of DLLs and what not). I've unpacked it from it's .zip file.

I've done 'extern "C"' and included all the necessary headers, yet not a single "lua_" function will work. This is the format of errors I get upon attempting to compile my c++ code:

[Linker error] C:\Users\<name redacted>\AppData\Local\Temp\cc4ZnwXr.o:test_lua.cpp:(.text+0x16): undefined reference to `lua_<function name here>'

This is the code itself:

#include <iostream>
#include "lua.hpp"

lua_State* L; 

int testing_func( lua_State *L )
{
	// Create a number from our argument
	double num = lua_tonumber( L, 1 ); // Made a double purely for precision purposes, in case our lua
	// argument is a float (and lua_tonumber accepts a double only, anyways)
	lua_pushnumber( L, num + 1 );
	return 1;
};

void report_errors(lua_State *L, int status)
{
	if ( status!=0 )
	{
		std::cerr << "-- " << lua_tostring(L, -1) << std::endl;
		lua_pop(L, 1); // remove error message
	}
}

int main(int argc, char** argv)
{
	for ( int n=1; n<argc; ++n ) // loop through to get various lua files we've made
	{
		const char* file = argv[n];

		lua_State *L = lua_open();

		luaopen_io(L);
		luaopen_base(L);
		luaopen_table(L);
		luaopen_string(L);
		luaopen_math(L);
		
		lua_register( L, "AddToNum", testing_func );
		std::cerr << "Loading file: " << file << std::endl;
		int s = luaL_loadfile(L, file);

		if ( s==0 ) 
		{
			// execute Lua program
			s = lua_pcall(L, 0, LUA_MULTRET, 0);
		}
		report_errors(L, s);
		lua_close(L);
		std::cerr << std::endl;
  }

  return 0;
}

What happened? I haven't made any .lua files as I wanted to test this out, is that the problem or is something else causing this?

[Zeh Matt]

Feeding it headers isnt enough, you have to link the lua lib file.