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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 09:39:30 +1200
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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>
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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.)

Ross Smith


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