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Date:	Wed, 12 Jul 2017 18:15:57 +0200 (CEST)
From:	bz0815 AT tirol DOT com
To:	cygwin AT cygwin DOT com
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Subject:	=?utf-8?Q?Pthreads=3A_Prototypes_missing_if_-std=3Dc11_?=
Message-ID:	<mtranet.20170712181557.1862059698@a1.net>
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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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