test case that fails with gcc -ansi -Wall -Werror, except with -D_POSIX_SOURCE

posix_source.c (text/x-csrc), 464 bytes, created by Zac Medico on 2018-04-26 00:09:41 UTC

/*
 * Test case for https://bugs.gentoo.org/650908
 * 
 * This fails as follows with gcc -ansi -Wall -Werror:
 * error: implicit declaration of function 'kill' [-Werror=implicit-function-declaration]
 * 
 * The problem is suppressed by -D_POSIX_SOURCE
 * 
 * See: https://stackoverflow.com/questions/9994530/warning-implicit-declaration-of-function-kill
 */

#include <sys/types.h>
#include <signal.h>
#include <stdio.h>
int main()
{
   kill(0, 0);
   return 0;
}