I am writing a simple test to include Lua in a C program.
I have the same problem for Windows / Mingw and Linux. Here is the gcc command I use on Linux:
gcc -Wall -o test_lua lua_test.c -I/usr/include/lua5.1 -llua5.1
On Windows:
gcc -Wall -o test_lua.exe lua_test.c -llua5.1
In both cases, I have the following warning:
warning: implicit declaration of function 'luaL_openlibs' [-Wimplicit-function-declaration]
The program works, but maybe I don’t use any standard Lua libs in it? Why am I getting this warning? I see the definition of luaL_openLibs in lauxlib.h !
Here is part C:
#include <lua.h> #include <lauxlib.h> #include <stdlib.h> #include <stdio.h> int main(int argc, char *argv[]) { int status; lua_State *L; L = luaL_newstate(); // Init lua luaL_openlibs(L); // Load script status = luaL_loadfile(L,"lua_test.lua"); if (status) { fprintf(stderr,"Couldn't load file\n"); exit(1); } // Push data lua_pushnumber(L, 5000); lua_setglobal(L, "clife"); lua_pushnumber(L, 6000); lua_setglobal(L, "ttime"); lua_pushnumber(L, 3000); lua_setglobal(L, "atime"); // Run script int result = lua_pcall(L, 0, LUA_MULTRET, 0); if (result) { fprintf(stderr,"Failed to run script: %s\n", lua_tostring(L,-1)); exit(1); } // Value at top of the stack is the result const char *schedule = lua_tostring(L,-1); fprintf(stdout,"Computed schedule is: %s\n", schedule); // Close lua lua_pop(L, 1); lua_close(L); return 0; }
Here is the part of Lua:
io.write("lua_test.lua -- will generate schedule\n") io.write("Wizard life is " .. clife .. "\n") schedule = "" ctime = ttime - atime if clife > 4500 then schedule = schedule .. "[" .. ctime .. ",p]" schedule = schedule .. "[" .. ctime+500 .. ",a]" schedule = schedule .. "[" .. ctime+1000 .. ",i]" schedule = schedule .. "[" .. ctime+1500 .. ",n]\n" else schedule = schedule .. "[" .. ctime .. ",d]" schedule = schedule .. "[" .. ctime+500 .. ",r]" schedule = schedule .. "[" .. ctime+1000 .. ",a]" schedule = schedule .. "[" .. ctime+1500 .. ",i]" schedule = schedule .. "[" .. ctime+1500 .. ",n]\n" end io.write("Returning " .. schedule .. "\n"); return schedule