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Subject:	Re: Updated: gcc-7.3.0-2 (x86/x86_64)
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From:	Ken Brown <kbrown AT cornell DOT edu>
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Date:	Wed, 30 May 2018 16:30:23 -0400
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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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