From: bz0815@tirol.com
To: cygwin@cygwin.com
Subject: Pthreads: Prototypes missing if -std=c11
Date: Wed, 12 Jul 2017 16:16:00 -0000 [thread overview]
Message-ID: <mtranet.20170712181557.1862059698@a1.net> (raw)
Hello,
gcc does not recognize some functions from pthread.h if option -std=c11 is used:
#include <pthread.h>
#define THREADS 5
int main (int argc, char *argv[])
{
pthread_barrier_t barrier;
pthread_barrier_init(&barrier, NULL, THREADS);
}
gcc -std=c11 -o test test.c
test.c: In function ‘main’:
test.c:8:3: warning: implicit declaration of function ‘pthread_barrier_init’ [-Wimplicit-function-declaration]
pthread_barrier_init(&barrier, NULL, THREADS);
^
There is no warning without that option:
gcc -o test test.c
My system is:
$ uname -a
CYGWIN_NT-10.0 DESKTOP 2.8.1(0.312/5/3) 2017-07-03 14:11 x86_64 Cygwin
The compiler used is:
$ gcc --version
gcc (GCC) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
It seems to be a __POSIX_VISIBLE issue.
Thanks
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next reply other threads:[~2017-07-12 16:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-12 16:16 bz0815 [this message]
2017-07-12 17:50 ` Yaakov Selkowitz
2017-07-13 15:36 bz0815
2017-07-13 17:38 ` cyg Simple
2017-07-13 19:30 ` Brian Inglis
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