VS2012 + Lua

[mekkatorqu]

So I've been following this tutorial http://www.youtube.com/watch?v=X5D_h2X8LCk , however Im getting errors about thaat my lib is not linked, however, IT IS, I have included both include and lib folders in project properties, lua5.2.lib is also included in the input of linker, not only in the code

#include <lua.hpp>
#include <Windows.h>

#pragma comment(lib, "lua5.2.lib")

int main(int argc, char** argv) {
  lua_State *L = luaL_newstate();
  luaL_openlibs(L);
 
  if (luaL_dofile(L, "test.lua")) {
    const char* err = lua_tostring(L, -1);
    printf(err);
  }
 
  lua_close(L);
 
  getchar();
  return 0;
}

1>Source.obj : error LNK2019: unresolved external symbol _lua_close referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol _lua_tolstring referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol _lua_pcallk referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol _luaL_openlibs referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol _luaL_loadfilex referenced in function _main
1>Source.obj : error LNK2019: unresolved external symbol _luaL_newstate referenced in function _main

+ lua in cmd works just fine

[mekkatorqu]

bump

[andywestken]

1. Have you turned on verbose logging for linking and checked to see if anything suspicious is going on?

Projects Properties > Linker > General

Show Progress = Display all progress messages (/VERBOSE)

2. You could dump the library and see if there's something wrong there. From a Visual Studio command prompt:

C:\Program Files\Lua\5.2\lib>link /dump /linkermember:1 lua5.2.lib > lua_exps.txt

Where the outputs being piped it into a text file for easier readability; if the lib file is ok you will see _luaL_newstate, _luaL_openlibs, etc there.

Andy

[mekkatorqu]

2. something, like this?

Microsoft (R) COFF/PE Dumper Version 11.00.50727.1
Copyright (C) Microsoft Corporation. All rights reserved.


Dump of file lua5.2.lib

File Type: LIBRARY

Archive member name at 8: /
526194FB time/date Fri Oct 18 22:07:23 2013
uid
gid
0 mode
1862 size
correct header end

297 public symbols

314E __IMPORT_DESCRIPTOR_lua5.2
3374 __NULL_IMPORT_DESCRIPTOR
34AA lua5.2_NULL_THUNK_DATA
4A06 __imp_lua_atpanic
4A06 lua_atpanic
6D38 __imp_lua_version
6D38 lua_version
4938 __imp_lua_absindex
4938 lua_absindex
535C __imp_lua_gettop
535C lua_gettop
6638 __imp_lua_settop
6638 lua_settop
5E14 __imp_lua_pushvalue
5E14 lua_pushvalue
6224 __imp_lua_remove
6224 lua_remove
5498 __imp_lua_insert
5498 lua_insert

1. the only suspicious thing I noticed was lua5.2 listed in the "unused libraries" list, but program can find it, since when I changed the name of the file I got error about lua5.2 not being able to find

[andywestken]

Well, the symbols don't look right in your dump -- they're missing the leading underscores.

I've just run through the exercise using Visual Studio 2012 (with no problems) and the dump I get begins:

Microsoft (R) COFF/PE Dumper Version 11.00.60610.1
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file lua5.2.lib

File Type: LIBRARY

Archive member name at 8: /               
5263DD5D time/date Sun Oct 20 14:40:45 2013
         uid
         gid
       0 mode
    1988 size
correct header end

    297 public symbols

     339A __IMPORT_DESCRIPTOR_lua5.2
     35C0 __NULL_IMPORT_DESCRIPTOR
     36F6 lua5.2_NULL_THUNK_DATA
     4C72 __imp__lua_atpanic
     4C72 _lua_atpanic
     7004 __imp__lua_version
     7004 _lua_version
     4BA2 __imp__lua_absindex
     4BA2 _lua_absindex
     55E0 __imp__lua_gettop
     55E0 _lua_gettop
     68F2 __imp__lua_settop
     68F2 _lua_settop
     60B8 __imp__lua_pushvalue
     60B8 _lua_pushvalue
     64D2 __imp__lua_remove
     64D2 _lua_remove
     5722 __imp__lua_insert
     5722 _lua_insert

You can see my symbols have the leading underscore.

I followed the instructions pretty closely (I just didn't bother to type the switches in capitals when the linker doesn't care whether you use /OUT or /out, etc.)

I can't think of an obvious reason why the symbols are missing the underscore.

Andy

[andywestken]

Just had a thought!

If I try to build my test app for x64 rather than x86, I get complaints that the symbols without underscores are missing.

1>main.obj : error LNK2019: unresolved external symbol lua_close referenced in function main
1>main.obj : error LNK2019: unresolved external symbol lua_tolstring referenced in function main
1>main.obj : error LNK2019: unresolved external symbol lua_pcallk referenced in function main
1>main.obj : error LNK2019: unresolved external symbol luaL_openlibs referenced in function main
1>main.obj : error LNK2019: unresolved external symbol luaL_loadfilex referenced in function main
1>main.obj : error LNK2019: unresolved external symbol luaL_newstate referenced in function main

So, have you ended up building your version of the library for x64 and then tried to use it with an x86 test app?

Andy

[mekkatorqu]

oh yea, I was using VS2012 x64 cross tool cmd, didnt think that this could cause the problem, will try to do it again with x86

edit: works perfectly! thanks!: )