OT: gcc warning: implicit declaration of function

[Bryce Schober <bryceman at dpzone dot com>]

Okay, I know I'm a bit off-topic here, but if you can help, that'd be 
great.  I don't understand this warning:

[shell]
$ arm-elf-gcc -g -c -Wall -o obj/test.o test.c
test.c: In function `main':
test.c:6: warning: implicit declaration of function `abs'
[/shell]


[test.c]
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int a = abs(-3);

    return a;
}
[/test.c]

Thanks.

--
Bryce Schober
Design Engineer
Dynon Avionics, Inc.
www.dynonavionics.com

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