Problem calling c++ from Lua (MS-Windows version)
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- Subject: Problem calling c++ from Lua (MS-Windows version)
- From: jseb <gmane2010@...>
- Date: 2011年2月21日 15:17:32 +0100
Hello,
I'm using Lua 5.1.4 with windows.
I'd like to call C++ functions from a dll.
It doesn't work with MS-Windows (work under Linux).
(gcc version is 4.4.0)
When i do the "require" in lua, i got this:
> require "libfoo"
error loading module 'libfoo' from file '.\libfoo.dll':
Le module spécifié est introuvable.
If i compile this code with gcc, it works.
So i think it's a name mangling problem.
I've looked the name with "nm", it seems good for me.
Here is the small code i use for testing:
// work with:
// gcc -shared testlua.c -o libfoo.dll -I/mingw/include/lua -llua51
// doesn't work with:
// g++ -shared testlua.c -o libfoo.dll -I/mingw/include/lua -llua51
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#ifdef __cplusplus
}
#endif
static int lua_print(lua_State *L)
{
printf ("called: lua_print\n");
return 0;
}
static const struct luaL_Reg foo_fx [] = {
{ "print", lua_print },
{ NULL, NULL } //dernier element obligatoire
};
#ifdef __cplusplus
extern "C" {
#endif
__declspec(dllexport) int luaopen_libfoo(lua_State *L)
// for Linux, symbol export is not the same (and you compile with
-fvisibility=hidden
// __attribute__((visibility("default"))) int luaopen_libfoo(lua_State *L)
{
luaL_register (L, "foo", foo_fx);
return 1;
}
#ifdef __cplusplus
}
#endif
Thank you.