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Subject: Re: [ANNOUNCEMENT] Updated: gcc-6.3.0-2 (x86/x86_64)(Test)
To: cygwin AT cygwin DOT com
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From: Ken Brown <kbrown AT cornell DOT edu>
Message-ID: <d37c88d1-697b-129a-8855-26c166509368@cornell.edu>
Date: Thu, 27 Jul 2017 17:45:56 -0400
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On 7/27/2017 5:39 PM, Ross Smith wrote:
> On 2017-07-28 09:19, Marco Atzeri wrote:
>> On 27/07/2017 23:04, Ross Smith wrote:
>>>
>>> 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
>>>
>>
>> it works for me on W7-64
>>
>> ./thread || echo "fail"
>> Start
>> Thread
>> Done
>>
>> $ g++ --version
>> g++ (GCC) 6.3.0
> 
> That's interesting. Maybe I have something wrong with my installation? I 
> updated the gcc-core, gcc-g++, and libgcc1 packages to the 6.3 test 
> version; was there something else I needed? (I found those by searching 
> the installed package list in the Cygwin installer for gcc or g++, and 
> seeing which ones offered the option of updating to 6.3; there doesn't 
> seem to be any way of checking what you actually need in a case like this.)

Click the test button when running setup.  You'll see several other 
packages with versions 6.3.0-2, including libstdc++6.

Ken

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