Re: Updated: gcc-7.3.0-2 (x86/x86_64)

[Ken Brown <kbrown at cornell dot edu>]

On 5/30/2018 7:58 AM, JonY wrote:
> On 05/29/2018 05:32 PM, Alberto Escrig Vidal wrote:
> > This program fails to compile (it also failed with g++-6).
> >
> > #include <shared_mutex>
> >
> > int main() {}
>
> I'm guessing Cygwin does not support the functionality declared in the
> headers yet.

I think the explanation is simpler.  The problem is that the 
shared_mutex header uses some pthread_rwlock_* functions (if __cplusplus 
>= 201402L) but the declaration of these in pthread.h is guarded by

  #if __XSI_VISIBLE >= 500 || __POSIX_VISIBLE >= 200112

I've submitted a patch to fix this:

  https://cygwin.com/ml/cygwin-patches/2018-q2/msg00018.html

Ken

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