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Bug#427722: pthread_kill() declaration disappears when compiling with -ansi

Package: libc6-dev
Version: 2.5-9+b1

When compiling with the -ansi flag in gcc, pthread_kill() is implicitly
defined.  The old behavior worked with -ansi.  See this example.

cat <<EOF >test.c
#include <pthread.h>
#include <signal.h>

void *start(void *arg) {return NULL;}

void test(void) {
        pthread_t t;

$ gcc -Wall -c test.c
(no warnings)

$ gcc -ansi -Wall -c test.c
test.c: In function 'test':
test.c:9: warning: implicit declaration of function 'pthread_kill'

$ uname -a
Linux porter 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686 GNU/Linux

$ ls -l /lib/libc.so.6
lrwxrwxrwx 1 root root 11 Jun  4 13:26 /lib/libc.so.6 -> libc-2.5.so

$ dpkg -s libc6 | grep Version
Version: 2.5-9+b1

$ ls -l /usr/include/signal.h
-rw-r--r-- 1 root root 13312 May 30 03:04 /usr/include/signal.h

$ ls -l /usr/include/bits/pthreadtypes.h
-rw-r--r-- 1 root root 4395 May 30 03:04 /usr/include/bits/pthreadtypes.h

$ tail -20 /usr/include/signal.h | head -6
#if defined __USE_POSIX199506 || defined __USE_UNIX98
/* Some of the functions for handling signals in threaded programs must
   be defined here.  */
# include <bits/pthreadtypes.h>
# include <bits/sigthread.h>
#endif /* use Unix98 */

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