How to create dll of Lua Module

I'm trying to write an external Lua module.

I work on Windows 8.1 and I use gcc as compiler.

My requirement is to build/compile everything all by myself without using pre-compiled files available online.

First of all, I build C source code of Lua 5.2.4 as follow:

1. gcc -c *.c

2. ren lua.o lua.obj

3. ren luac.o luac.obj

4. ar rcs luaX.X.X.lib *.o

5. gcc -shared -o luaX.X.X.dll *.o

6. gcc lua.c luaX.X.X.lib -o luaX.X.X.exe

7. gcc luac.c luaX.X.X.lib -o luacX.X.X.exe

8. del *.o *.obj

where X.X.X is the source code revision.

Once I created my .exe, I write the C code of my module (let's call it LuaMath):

#include<windows.h> #include<math.h> #include "lauxlib.h" #include "lua.h"   static int IdentityMatrix(lua_State *L) {     int in = lua_gettop(L);     if (in!=1)     {        lua_pushstring(L,"Maximum 1 argument");        lua_error(L);     }     lua_Number n = lua_tonumber(L,1);     lua_newtable(L);                  /*                 tabOUT n */     int i,j;     for (i=1;i<=n;i++)     {         lua_newtable(L);              /*         row(i) tabOUT n */         lua_pushnumber(L,i);          /*       i row(i) tabOUT n */         for (j=1;j<=n;j++)         {             lua_pushnumber(L,j);      /*     j i row(i) tabOUT n */             if (j==i)             {                 lua_pushnumber(L,1);             }             else                      /* 0/1 j i row(i) tabOUT n */             {                 lua_pushnumber(L,0);             }             /*  Put 0/1 inside row(i) at j position */             lua_settable(L,-4);       /*       i row(i) tabOUT n */         }         lua_insert(L,-2);             /*       row(i) i tabOUT n */          /* Insert row(i) into position in tabOUT */         lua_settable(L,2);            /*                tabOUT n */     }     return 1; }   static const struct luaL_Reg LuaMath [] = {{"IdentityMatrix", IdentityMatrix},                                            {            NULL,           NULL}};  int __declspec(dllexport) luaopen_LuaMath(lua_State *L) {     luaL_newlib(L,LuaMath);     return 1; } 

then I compile it linking to dynamic library.dll as follow:

gcc -shared -L "<path where luaX.X.X.dll is>" -l "luaX.X.X" LuaMath.c 

When I call the the module into Lua code as follow:

require("LuaMath") 

the output is:

> require("LuaMath") multiple Lua VMs detected stack traceback:         [C]: in ?         [C]: in function 'require'         stdin:1: in main chunk         [C]: in ? > 

What do I do wrong?

Many thanks in advance.

2 Answers

Answers 1

Do not link the Lua library with your DLL. That's what the error message is telling you.

Answers 2

May be you need define a SYSCFLAGS LUA_BUILD_AS_DLL then compile the lua code again

gcc -DLUA_BUILD_AS_DLL -c *.c 

Why not you use the Makefile which provide by Lua source? It is easy way to complie, if you read the Makefile， it set the gcc flags for you.

cd /path/to/lua-src make mingw 

now you should get lua.exe, luac.exe, lua53.dll in /path/to/lua-src/src/

compile your module

gcc -shared -I/path/to/lua-src/src LuaMath.c -o LuaMath.dll -L/path/to/lua-src/src -llua53 

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