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Subject: Re: g++ std::map initializing raises segmentation fault.
To: cygwin AT cygwin DOT com
References: <20170706 DOT 212622 DOT 2189310858003243560 DOT trueroad AT trueroad DOT jp>
From: Ken Brown <kbrown AT cornell DOT edu>
Message-ID: <fc380e9c-757d-eeab-86fc-82eaf1550402@cornell.edu>
Date: Fri, 7 Jul 2017 11:12:31 -0400
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On 7/6/2017 8:26 AM, Masamichi Hosoda wrote:
> Hello,
> 
> On Cygwin 2.8.1 x86_64, I've found that g++ std:map initializing
> may raise segmentation fault.
> The binary compiled with cygwin-devel-2.8.0-1
> does not raise segmentation fault
> even if on Cygwin 2.8.1 x86_64 environments.
> 
> So I suspect cygwin-devel-2.8.1-1 is the cause.
> 
> Here's sample code for reproduce.
> 
> ```
> // foo.cc
> // g++ -std=c++11 foo.cc
> 
> #include<iostream>
> #include<map>
> 
> std::map<int, int> m
> {
>    { 1, 1},
>    { 2, 2}
> };
> 
> int main ()
> {
>    std::cout << "Hello World!" << std::endl;
> }
> ```
> 
> I've reproduced it on both Windows 7 64 bit and Windows 10 64 bit.
> 
> ```
> $ ./a
> Segmentation fault (core dumped)

I've just checked that the problem occurs with the 2017-06-20 snapshot 
but not with the 2017-06-06 snapshot.  I don't have time right now to do 
a further bisection, but I can probably do it later today or over the 
weekend if no one beats me to it.

Ken


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