[NTG-context] About loading C libraries (again)

Jairo A. del Rio jairoadelrio6 at gmail.com
Wed Nov 4 11:01:29 CET 2020

Hi. I've just read in the LuaMetaTeX manual that --permitloadlib allows
loading compiled (.so/.dll) libraries. However, when I try it using ConTeXt
I have an error message (example below):




local hello = require"hellolib" -- hellolib.so




#include <lua.h>
#include <lauxlib.h>

static int helloworld (lua_State *L) {
    char hello[] = "Hello world!";
    lua_pushstring(L, hello);
    return 1;

static const struct luaL_Reg hellolib [] = {
      {"helloworld", helloworld},
      {NULL, NULL}

int luaopen_hellolib (lua_State *L){
    luaL_newlib(L, hellolib);
    return 1;

error (lua loadlib): you can only load external libraries when
--permitloadlib is given

On the other hand, manually calling LuaMetaTeX with the ConTeXt format and
--permitloadlib gives the expected result (in this case, a "Hello world!").

How is the correct way to load those libraries? Thank you very much and
sorry if my question seems to be weird.

Best regards,

Jairo :)
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