crypt function and link error “undefined reference to 'crypt'”

Question

I have used the crypt function in c to encrypt the given string. I have written the following code,

#include
#include

int mai         


        

Answer 1

If you want to use the crypt() function, you need to link to the library that supplies it. Add -lcrypt to your compile command.

Older versions of glibc supplied a libcrypt library for this purpose, and declared the function in - to compile against this support, you may also need to define either _XOPEN_SOURCE or _GNU_SOURCE in your code before including .

Newer versions of glibc don't supply libcrypt - it is instead provided by a separate libxcrypt. You still link with -lcrypt, but the function is instead declared in .