undefined reference to `getline' in c
c, getline, mingw32, reference, undefined
Solution
The other answers have covered most of this, but there are several problems. First, `getline()` is not in the C standard library, but is a POSIX 2008 extension. Normally, it will be available with a POSIX-compatible compiler, as the macros _POSIX_C_SOURCE will be defined with the appropriate values. You possibly have an older compiler from before `getline()` was standardized, in which case this is a GNU extension, and you must `#define _GNU_SOURCE` before `#include <stdio.h>` to enable it, and must be using a GNU-compatible compiler, such as gcc.
Additionally, `nbytes` should have type `size_t`, not `int`. On my system, at least, these are of different size, with `size_t` being longer, and using an `int*` instead of a `size_t*` can have grave consequences (and also doesn't compile with default gcc settings). See the getline manual page (http://linux.die.net/man/3/getline) for details.
With that change made, your program compiles and runs fine on my system.
Problem
I am learning to use getline in C programming and tried the codes from http://crasseux.com/books/ctutorial/getline.html ``` #include <stdio.h> #include <stdlib.h> #include <string.h> int main(int atgc, char *argv[]) { int bytes_read = 1; int nbytes = 10; char *my_string; my_string = (char *)malloc(nbytes+1); puts("Please enter a line of text"); bytes_read = getline(&my_string, &nbytes, stdin); if (bytes_read == -1) { puts ("ERROR!"); } else { puts ("You typed:"); puts (my_string); } return 0; } ``` However, the problem is that the compiler keeps returning errors of this: undefined reference to 'getline'. Could you please tell me what the problem is? Thank you! I am using Win7 64bit + Eclipse Indigo + MinGW