Using Lua with C++

Question

I'm trying to embed lua in a c program, but I'm having problems to compile the code. I have installed everything lua 5.2 related in synaptic and when tried to compile this:

extern "C"{
#include <stdio.h>
#include <string.h>
#include "lua5.2/lua.h"
#include "lua5.2/lauxlib.h"
#include "lua5.2/lualib.h"
}

int main(int argc, char* argv[])
{
    lua_State *lua_state;
    lua_state = luaL_newstate();
    lua_close(lua_state);
}

and compile using

g++ main.cpp -llua

show the folowing errors

Could not find -llua

what do?

Please decide: Shall that be a C or a C++ program? BTW: You can compile Lua both as C as well as C++, though I would leep it C. Also, neither <stdio.h> nor <string.h> should be wrapped in an extern "C"-block. — Deduplicator
– Deduplicator, Commented Aug 17, 2014 at 15:33
@redFIVE Like this? g++ main.cpp -L/usr/lib/lua/5.2/ -llua . Still not find -llua — Coyote
– Coyote, Commented Aug 17, 2014 at 15:41
@Deduplicator No o.O . there is a rdd.so and no liblua.so anywhere im my pc. Why not? I have installed everything lua5.2 disponible. — Coyote
– Coyote, Commented Aug 17, 2014 at 15:57

Captain Giraffe · Accepted Answer · 2014-08-17 16:07:36Z

1

There are tools you can use to find the proper compiler / linker switches for a library.

In particular, with a proper installation of the lua5.2 libraries you can use

pkg-config -libs lua5.2

On my system it outputs

-llua5.2

Use this, or the output of pkg-config (backticked) as your linkers argument.

Of course, pkg-config can also tell you the -CFLAGS for the package with

pkg-config --cflags lua5.2

The man page is quite readable.

edited Aug 17, 2014 at 16:07

answered Aug 17, 2014 at 16:02

Captain Giraffe

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