Re: [help] undefined symbol when loading shared object module from embedded lua_state

[Wesley Smith <wesley.hoke@...>]

you can check whether your symbols are exported using the 'nm' tool.

wes

On Mon, Mar 29, 2010 at 6:16 PM, Dirk Feytons <dirk.feytons@gmail.com> wrote:
> On Mon, Mar 29, 2010 at 18:03, Phoenix Sol <phoenix@burninglabs.com> wrote:
>> I have Lua embedded in a C program, and it raises an error when loading
>> a script which loads a C module.
>>
>> I'm compiling the program like this:
>> gcc uckfuped.c -Wall -O2 -I/usr/local/include -L/usr/local/lib -llua
>> -ldl -lm -o uckfuped
>>
>> And when I run it, it tells me:
>> error loading module 'nixio' from file
>> '/usr/local/lib/lua/5.1/nixio.so': /usr/local/lib/lua/5.1/nixio.so:
>> undefined symbol: lua_getmetatable
>>
>>
>> Hopefully the problem is obvious to someone more experienced? Thanks.
>
> You need to tell the linker to export the Lua symbols so they are
> visible to a dynamic object that is loaded at runtime. With GCC it's
> typically the following you need to add to your link command: -Wl,-E
> (see also the 'ld' man page).
>
> --
> Dirk
>