Hey everyone I found this code that embeds Lua in C and I cannot figure out how to get GCC to compile it. I have Lua installed, but how do I link the Lua libraries?
Here is the code I found:
#include <stdio.h>
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
/* lua interpreter */
lua_State* l;
int main () {
int dofile;
/* initialize lua */
l = lua_open();
/* load lua libraries */
luaL_openlibs(l);
/* run the hello.lua script */
dofile = luaL_dofile(l, "hello.lua");
if (dofile == 0) {
/* call foo */
lua_getglobal(l,"foo");
lua_call(l,0,0);
}
else {
printf("Error, unable to run hello.lua\n");
}
/* cleanup Lua */
lua_close(l);
return 0;
}
How do I get this to compile?
I am trying this command to compile
gcc -o embed_hello -L/users/etrosclair/Downloads/lua-5.1.4 -I/users/etrosclair/Downloads/lua-5.1.4 luaTest.c
Here is the error:
Undefined symbols for architecture x86_64:
"_luaL_newstate", referenced from:
_main in ccF0995Q.o
"_luaL_openlibs", referenced from:
_main in ccF0995Q.o
"_luaL_loadfile", referenced from:
_main in ccF0995Q.o
"_lua_pcall", referenced from:
_main in ccF0995Q.o
"_lua_getfield", referenced from:
_main in ccF0995Q.o
"_lua_call", referenced from:
_main in ccF0995Q.o
"_lua_close", referenced from:
_main in ccF0995Q.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
All the lua libraries and headers are in the lua-5.1.4 folder the .o files are also in there too.
Thanks
Thanks
Depends if you want it statically or dynamically compiled.
For static, add -llua (or lua5.1 or lua51; depending on your setup)
Related
I use gcc to complile the code
#include <stdio.h>
#include <stdlib.h>
#include <libimobiledevice/lockdown.h>
#include <libimobiledevice/libimobiledevice.h>
#include <plist/plist.h>
int main()
{
static char *udid = NULL;
/* Device Handle */
idevice_t device = NULL;
/* Try to connect to first USB device */
if (idevice_new_with_options(&device, NULL, IDEVICE_LOOKUP_USBMUX) != IDEVICE_E_SUCCESS) {
printf("ERROR: No device found!\n");
return -1;
}
/* Retrieve the udid of the connected device */
if (idevice_get_udid(device, &udid) != IDEVICE_E_SUCCESS) {
printf("ERROR: Unable to get the device UDID.\n");
idevice_free(device);
return -1;
}
/* Outputs device identifier */
printf("Connected with UDID: %s\n", udid);
/* Cleanup */
idevice_free(device);
free(udid);
}
got
Undefined symbols for architecture x86_64:
"_idevice_free", referenced from:
_main in 1-af7b2e.o
"_idevice_get_udid", referenced from:
_main in 1-af7b2e.o
"_idevice_new_with_options", referenced from:
_main in 1-af7b2e.o
ld: symbol(s) not found for architecture x86_64
while I have tried gcc -lstdc++ hello.c -o hello it's still cann't be compiled.
You need to include the libimobiledevice library, try this:
gcc hello.c -o hello -limobiledevice-1.0
I'm super new to CMake, and for now it all looks like black magic to me.
Example that I token is from here!
How to properly include Lua(5.1) lib and link it with CMake?
Sample works when compiled by hands as in
$gcc -W -Wall -g -o main main.c -I/usr/local/include -L/usr/local/lib/lua/5.1 -llua
#include <stdio.h>
#include <string.h>
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
int main(void) {
puts("lua interpretor:");
char buff[256];
int error;
lua_State *L = luaL_newstate(); /* opens Lua */
luaL_openlibs(L); /* opens the standard libraries */
while (fgets(buff, sizeof(buff), stdin) != NULL) {
error = luaL_loadbuffer(L, buff, strlen(buff), "line") ||
lua_pcall(L, 0, 0, 0);
if (error) {
fprintf(stderr, "%s", lua_tostring(L, -1));
lua_pop(L, 1); /* pop error message from the stack */
}
}
lua_close(L);
return 0;
}
current CMakeList.txt looks like
cmake_minimum_required(VERSION 3.8)
project(test)
set(CMAKE_C_STANDARD 11)
set(SOURCE_FILES main.c)
include_directories(/usr/local/include)
add_executable(test ${SOURCE_FILES})
and err.log
Undefined symbols for architecture x86_64:
"_luaL_loadbufferx", referenced from:
_main in main.c.o
"_luaL_newstate", referenced from:
_main in main.c.o
"_luaL_openlibs", referenced from:
_main in main.c.o
"_lua_close", referenced from:
_main in main.c.o
"_lua_pcallk", referenced from:
_main in main.c.o
"_lua_settop", referenced from:
_main in main.c.o
"_lua_tolstring", referenced from:
_main in main.c.o
You haven't linked the Lua library to the executable. This is done using target_link_libraries(). You'll need to locate or specify the location of the library first though. Luckily for you, Lua ships with a cmake script for finding Lua.
project(test)
find_package(Lua51 REQUIRED)
include_directories(/usr/local/include ${LUA_INCLUDE_DIR})
set(CMAKE_C_STANDARD 11)
set(SOURCE_FILES main.c)
add_executable(test ${SOURCE_FILES})
target_link_libraries(test ${LUA_LIBRARIES})
I am trying to compile a simple allegro5 program on Mac OSX 10.12 but am getting an undefined symbols error. Here is the command I ran in the terminal
gcc main.c -o hello -I/usr/local/include/ -L/usr/local/lib -lallegro_main
And here is my code.
#include <stdio.h>
#include <allegro5/allegro.h>
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display = NULL;
if(!al_init())
{
fprintf(stderr, "failed to initialize allegro!\n");
return -1;
}
display = al_create_display(640, 480);
if(!display)
{
fprintf(stderr, "failed to create display!\n");
return -1;
}
al_clear_to_color(al_map_rgb(0,0,0));
al_flip_display();
al_rest(10.0);
al_destroy_display(display);
return 0;
}
Here is the error I get
Undefined symbols for architecture x86_64:
"_al_clear_to_color", referenced from:
__al_mangled_main in main-b86b99.o
"_al_create_display", referenced from:
__al_mangled_main in main-b86b99.o
"_al_destroy_display", referenced from:
__al_mangled_main in main-b86b99.o
"_al_flip_display", referenced from:
__al_mangled_main in main-b86b99.o
"_al_install_system", referenced from:
__al_mangled_main in main-b86b99.o
"_al_map_rgb", referenced from:
__al_mangled_main in main-b86b99.o
"_al_rest", referenced from:
__al_mangled_main in main-b86b99.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Is it possible that I did not install allegro correctly? I installed it using homebrew according to the allegro wiki instructions. https://wiki.allegro.cc/index.php?title=Getting_Started#Mac_OS
Those are linker errors. You need to link to lallegro.
Does anybody know how to compile the following code with Cilk plus in gcc5.2.0 correctly? With gcc -fcilkplus * or g++, I always get errors.
#include <cilk/cilk.h>
#include <assert.h>
int fib(int n) {
if (n < 2)
return n;
int a = cilk_spawn fib(n-1);
int b = fib(n-2);
cilk_sync;
return a + b;
}
int main() {
int result = fib(30);
assert(result == 832040);
return 0;
}
result:
Undefined symbols for architecture x86_64:
"___cilkrts_enter_frame_1", referenced from:
fib(int) in ccY1qrGL.o
"___cilkrts_enter_frame_fast_1", referenced from:
__cilk_spn_0 in ccY1qrGL.o
"___cilkrts_leave_frame", referenced from:
fib(int) in ccY1qrGL.o
__cilk_spn_0 in ccY1qrGL.o
"___cilkrts_rethrow", referenced from:
fib(int) in ccY1qrGL.o
"___cilkrts_save_fp_ctrl_state", referenced from:
fib(int) in ccY1qrGL.o
"___cilkrts_sync", referenced from:
fib(int) in ccY1qrGL.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
There are very few topics about this online. thanks
GCC is configured to add -lcilkrts by default to its linker command when -fcilkplus is given by users, but this default behavior can be overridden if there is any platform-specific configuration. I think that is happening on OS X, but it needs to be fixed in my opinion. Anyway, it seems that there is no short-term solution other than adding -lcilkrts as suggested above.
I am a newbie in C... I wrote a very simple modbus1.c that includes libmodbus (whose source I downloaded, unzipped, untarred, ./configure'd, make'd and make install'd successfully).
When I try to make modbus1.c I get this:
cc -Wall -g modbus1.c -o modbus1
Undefined symbols for architecture x86_64:
"_modbus_close", referenced from:
_main in modbus1-6cd135.o
"_modbus_connect", referenced from:
_main in modbus1-6cd135.o
"_modbus_free", referenced from:
_main in modbus1-6cd135.o
"_modbus_new_tcp_pi", referenced from:
_main in modbus1-6cd135.o
"_modbus_read_bits", referenced from:
_main in modbus1-6cd135.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [modbus1] Error 1
I am running OSX snow leopard and have successfully used make to compile small programs before (tutorial level programs...) Here is the modbus1.c I am trying to compile:
#include <stdio.h>
#include <stdlib.h>
#include <modbus.h>
int main(int argc, char *argv[]){
modbus_t *plc_client;
plc_client = modbus_new_tcp_pi("192.168.1.230","502");
if (plc_client == NULL) {
fprintf(stderr, "Unable to allocate libmodbus context\n");
return -1;
}
if (modbus_connect(plc_client) == -1) {
fprintf(stderr, "Connection failed: \n");
modbus_free(plc_client);
return -1;
}
else if(modbus_connect(plc_client) == 0) {
printf("MODBUS CONNECTION SUCCESSFUL\n");
}
uint8_t* catcher = malloc(sizeof(uint8_t));
if(modbus_read_bits(plc_client, 2000, 1, catcher)>0){
printf("READ SUCCESSFUL");
}
else{
printf("READ FAILED");
}
free(catcher);
modbus_close(plc_client);
modbus_free(plc_client);
return 0;
}
Any help will be greatly appreciated! Thanks!
-Niko
Try this
cc -Wall -g modbus1.c -o modbus1 -L/path/to/libmodbus -lmodbus
You should replace that /path/to/libmodbus with the actual path of directory that includes the libmodbus.dylib in your system.