Warning in function strlen - in C

Question

i have function on C

int myFunction(Room* room, char** buffer) {

    int l1;
    l1 = strlen(*buffer);
.
.
.
    return l1
}

And after compile with gcc i get a warning on line l1 = strlen(*buffer);:

warning: incompatible implicit declaration of built-in function 'strlen' [enabled by default]

What is is? How can i solve it?

score 2 · Answer 1 · answered Dec 22 '14 at 08:28

2

Include the correct header at the top of your source file:

#include <string.h>

To call a function you need to have a declaration for this function. strlen function declaration is in string.h standard header.

answered Dec 22 '14 at 08:28

ouah

Oh, this easy problem make me angry :-D thank you :-) – staigoun Dec 22 '14 at 08:33
Thank you so much! However, I was wondering why would it give me a warning instead of an error if I didn't include ? – Danny Sep 29 '19 at 12:08

1 Answers1