~chuck/blog » compiling http://www.ozymo.com What more could you want? Tue, 17 Oct 2023 03:57:54 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Teensy ELF executables http://www.ozymo.com/explosions/321 http://www.ozymo.com/explosions/321#comments Wed, 17 Mar 2010 06:13:34 +0000 chuck http://www.ozymo.com/?p=321 Holy crap. I wish I was at awesome as systems programming as this guy.

/cs

]]> http://www.ozymo.com/explosions/321/feed 0 warning: incompatible implicit declaration of built-in function ‘strlen’ http://www.ozymo.com/explosions/22 http://www.ozymo.com/explosions/22#comments Sun, 02 Mar 2008 20:31:30 +0000 chuck http://www.ozymo.com/~chuck/blog/2008/03/02/warning-incompatible-implicit-declaration-of-built-in-function-%e2%80%98strlen%e2%80%99/ This is an error presented by the GNU Compiler Collection (which I still like to call the GNU C Compiler) when compiling a piece of code that calls to a function in the <string.h> header file if it cannot find the function.

Typically, this is caused by a call to the strlen function when the <string.h> header has not been included.

$ grep ‘#include’ whiteout.c
#include <stdio.h>
$ gcc -o ../whiteout whiteout.c
whiteout.c: In function ‘trim’:
whiteout.c:49: warning: incompatible implicit declaration of built-in function ‘strlen’
whiteout.c: In function ‘add’:
whiteout.c:64: warning: incompatible implicit declaration of built-in function ‘strlen’

$ grep ‘#include’ whiteout.c
#include <stdio.h>
#include <string.h>
$ gcc -o ../whiteout whiteout.c
$

As you can see, simply placing the statement ‘#include <string.h>’ into your includes section of your code will alleviate the issue.

/cs

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