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Pthreads: Prototypes missing if -std=c11
- From: bz0815 at tirol dot com
- To: cygwin at cygwin dot com
- Date: Wed, 12 Jul 2017 18:15:57 +0200 (CEST)
- Subject: Pthreads: Prototypes missing if -std=c11
- Authentication-results: sourceware.org; auth=none
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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