Hi all, I am currently getting linker errors with lua. I attempting to use lua in a Direct3D application. Here are the linker errors i am getting: GradeSchoolWars error LNK2005: ___endstdio already defined in LIBCD.lib(_file.obj) GradeSchoolWars error LNK2005: ___initstdio already defined in LIBCD.lib(_file.obj) GradeSchoolWars error LNK2005: ___iob_func already defined in LIBCD.lib(_file.obj) GradeSchoolWars error LNK2005: __cflush already defined in LIBCD.lib(_file.obj) GradeSchoolWars error LNK2005: __iob already defined in LIBCD.lib(_file.obj) GradeSchoolWars fatal error LNK1169: one or more multiply defined symbols found GradeSchoolWars warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library I have all the lua library files included in my resource files. Here is the code that uses lua:

// Scriptmanager.h
#ifndef _SCRIPTMANAGER_H_
#define _SCRIPTMANAGER_H_

#pragma once

extern "C"
{
	#include <lua.h>
	#include <lauxlib.h>
	#include <lualib.h>
}

class CScriptManager
{
	public:

		CScriptManager ( );
		~CScriptManager( );

		// Init ( )
		//
		// Initialize LUA and standard libraries.
		bool Init ( );

	private:

		lua_State *mState;
};

#endif

// Scriptmanager.cpp

#include "GAF_ScriptManager.h"

CScriptManager::CScriptManager ( )
{
//	mState = 0;
}

CScriptManager::~CScriptManager ( )
{
}

bool CScriptManager::Init ( )
{
	mState = lua_open ( );

	if ( mState == 0 )
		return false;

	lua_baselibopen(mState);
	lua_iolibopen(mState);
	lua_strlibopen(mState);
	lua_mathlibopen(mState);

	return true;
}

This code compiles ok on its own, in a win32 console application. It is only when i add the class to our main game project that the errors occur. I thought it might possibly be a conflict with DirectX, as we use dshow, dinput, dmusic, ect.. So i one, by one, inlcluded each DX header and library file in my compiling program. I could not get the error to repeat. It seems it only occurs in the project. I have dug through the docs, wiki, and searched all i can to find possible conflicts with lua - but nothing that resembles the problems i am currently having. Any and all help will be greatly appreciated, Thanks, -gf

LIBCMT has to do with multithreading.
The error you are getting happens in projects including non-multithreaded libraries in a multithreaded project.
It can also happen when you are including debug libs in a release build and vice-versa.

Recompile the lua libraries with the same release settings as the application you are trying to compile.

I am having the same problem as the OP.

When compiling the static libs for Lua, they should they be mutli-threaded, and not mutli-threaded-dll correct?

I compiled them with multi-thread and compiled the test app with multi-thread and still the same errors occur, except I get:

test warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library

So I tried using /NODEFUALTLIB and I just get a ton of undefined symbol linker errors for every lua function.

I've been trying to get lua to work awhile now and these libs are being a pain in the arse.

Changing the project settings to multithreaded debug /MTd fixed the problem. i think i understand why now too, thanks!

I also had this same problem, If you use the /NODEFAULTLIB "libname" option where libname is the name of the library listed in the link error it will exclude that one library and it will link properly. If you use /NODEFAULTLIB it will exclude all default libraries and cause several unresolved ref problems.