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To: cygwin@cygwin.com
From: Ross Smith <ross.smith@otoy.com>
Subject: Re: [ANNOUNCEMENT] Updated: gcc-6.3.0-2 (x86/x86_64)(Test)
Date: Fri, 28 Jul 2017 09:04:52 +1200
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References: <announce.db6c6795-264e-0936-152e-cfc7adbe2799@gmail.com> <8dd126b8-69aa-fb61-c12a-3d4afb821a66@cornell.edu>
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On 2017-07-28 02:49, Ken Brown wrote:
> On 6/29/2017 7:16 AM, JonY wrote:
>> gcc-6.3.0-2 has been uploaded for Cygwin. It is marked as a test version.
> 
> JonY,
> 
> I assume you want some feedback on this.
> 
> I've been testing gcc-6.3.0-2 with binutils-2.28-3, on both x86 and 
> x86_64, by rebuilding several of my packages.  So far I've built 
> texlive, emacs, and icu.  There have been no problems, and all builds 
> have passed their test suites.
> 
> Ken

gcc 6.3 works fine for me unless I use threads. Any C++ program that 
uses std::thread (and worked with the previous gcc) will fail. Simple 
example:

     #include <iostream>
     #include <thread>
     void payload() {
         std::cout << "Thread\n";
     }
     int main() {
         std::cout << "Start\n";
         std::thread t(payload);
         t.join();
         std::cout << "Done\n";
     }

Build and run with:

     g++ thread.cpp -o thread && ./thread || echo Fail

This will print Fail, indicating that the executable errored out. 
There's no other output. Sorry, I'm not familiar enough with gcc 
debugging to narrow down the error further.

Code that uses raw pthreads instead of the C++ API works fine.

(I'm running 64-bit Cygwin on Windows 8.1.)

Ross Smith


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