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To:	cygwin AT cygwin DOT com
From:	Ross Smith <ross DOT smith AT otoy DOT com>
Subject:	Re: [ANNOUNCEMENT] Updated: gcc-6.3.0-2 (x86/x86_64)(Test)
Date:	Fri, 28 Jul 2017 13:24:41 +1200
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Message-ID:	<1e8b1bd6-f2f4-7e70-c7fe-7f5b29a6c325@otoy.com>
References:	<announce DOT db6c6795-264e-0936-152e-cfc7adbe2799 AT gmail DOT com> <8dd126b8-69aa-fb61-c12a-3d4afb821a66 AT cornell DOT edu> <1a57c104-79d1-2ea7-90d3-2be3182a2e1e AT otoy DOT com> <120c0997-0182-f4e6-0dfd-5d5afd6fd182 AT gmail DOT com> <8c67221f-19b9-26a3-2562-53a1b01e5fb9 AT otoy DOT com> <d37c88d1-697b-129a-8855-26c166509368 AT cornell DOT edu>
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On 2017-07-28 09:45, Ken Brown wrote:
> 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.

Thanks! Yes, turns out I was missing some packages. Everything works 
now. Sorry for the false alarm!

Ross Smith


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