Linker problems with libcurl in eclipse C\Cpp - c

Question

im trying to use libcurl in Eclipse C\Cpp and cross compiling it to a Raspberry Pi for a university project. I have included the header files and added the -lcurl option in the compiler.
#include <stdio.h>
#include <unistd.h> //Used for UART
#include <fcntl.h> //Used for UART
#include <termios.h> //Used for UART
#include "anybus.h"
#include <string.h>
#include <time.h>
#include <wiringPi.h>
#include "curl.h"
int main()
{
CURL *curl;
CURLcode res;
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "Accept: application/json");
headers = curl_slist_append(headers, "Content-Type: application/json");
headers = curl_slist_append(headers, "charsets: utf-8");
char* string = "{\"name\":\"JohnDoe\"}";
printf(string);
// In windows, this will init the winsock stuff
res = curl_global_init(CURL_GLOBAL_ALL);
// get a curl handle
curl = curl_easy_init();
if(curl) {
// First set the URL that is about to receive our POST. This URL can
// just as well be a https:// URL if that is what should receive the
// data.
curl_easy_setopt(curl,CURLOPT_HTTPHEADER, headers );
curl_easy_setopt(curl, CURLOPT_URL, "http://134.61.41.2:8080/Cascade/rest/maschinen");
// Now specify the POST data
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, string);
// Perform the request, res will get the return code
res = curl_easy_perform(curl);
// Check for errors
if(res != CURLE_OK){
printf("Curl Easy Perform failed\n");
}
// always cleanup
curl_easy_cleanup(curl);
}
curl_global_cleanup();
}
However when I compile it I get undefined references to most of the curl functions, but not the curl objects CURL *curl and CURLcode res.
Building target: RaspAnybusDriver_2007.a
Invoking: Cygwin C++ Linker
arm-unknown-linux-gnueabi-g++ -L"c:\cygwin\opt\cross\x-tools\arm-unknown-linux- gnueabi\arm-unknown-linux-gnueabi\sysroot\usr\lib" -L"C:\cygwin\raspberry\usr\lib" -L"C:\cygwin\lib\python2.7" -L"C:\cygwin\lib" -o "RaspAnybusDriver_2007.a" ./anybus.o ./bytefloat.o ./main.o -lrt -lcurl.dll -lwiringPi
./main.o: In function `main':
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:17: undefined reference to `curl_slist_append'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:18: undefined reference to `curl_slist_append'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:19: undefined reference to `curl_slist_append'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:26: undefined reference to `curl_global_init'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:29: undefined reference to `curl_easy_init'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:34: undefined reference to `curl_easy_setopt'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:35: undefined reference to `curl_easy_setopt'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:37: undefined reference to `curl_easy_setopt'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:40: undefined reference to `curl_easy_perform'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:47: undefined reference to `curl_easy_cleanup'
/cygdrive/c/Users/Bjorn/workspace/RaspAnybusDriver_2007/Debug/../main.c:49: undefined reference to `curl_global_cleanup'
collect2: ld returned 1 exit status
make: *** [RaspAnybusDriver_2007.a] Error 1
Does anyone have a clue to whats going on?

Answer 1

After looking at compilation log it seems that the linker is not able to find the curl.. functions. So verify at the build setting in eclipse.