getline , ssize_t not working

Question

Hello friends, I am using Code Blocks 17.12 MinGW GNU GCC Compiler, using getline and ssize_t in my C program but getting error.
Because of compiler, read that _GNU_SOURCE required for this.
Could you please anyone explain what is that and who to install.

Answer 1

Write #define _GNU_SOURCE at the top of your code if you haven't already or check if you included right libraries