X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:from:to:references:message-id:date
	:mime-version:in-reply-to:content-type
	:content-transfer-encoding; q=dns; s=default; b=ETJhbkbinsJ7wXaQ
	30AT7axZoxhTjl47D8H99rT9F/71+IM2lEpPlv6iZhbHe8f1D8RwCq6imF7ZlY4D
	InB1QqfFp/dDbpja9Fta+F0snroO3JcoAJKbbgiJaed5PL4vUHqYZJuCVkk9xUkZ
	CiogrgcvK0xib5DB0Gy7DwYZIJA=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:from:to:references:message-id:date
	:mime-version:in-reply-to:content-type
	:content-transfer-encoding; s=default; bh=PYQRkM9UCWZW8ylyXC+iEP
	kHw+E=; b=fqPXMojkUhRrBuuGWqgZXzufZW9rG5yPrrSMJDWLBB42+YFLkdql5D
	DWJ5CXVCfXQhmeD2Ytzz7Uflw5vPlksmGMg93g3WQSFgrtXow+gsXuL4wDBqiJ4Z
	mhrUP94SL8UsjzLTRV4NvWfsndCzwXx25wLvxweJ00jK8dG0u4axE=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-0.9 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,KAM_SHORT,RCVD_IN_DNSWL_NONE autolearn=no version=3.3.2 spammy=atzeri, Atzeri, symptoms, Hx-spam-relays-external:sk:mailout
X-HELO:	mailout11.t-online.de
Subject:	Re: GCC 7.3.0 -std=gnu++17 failed to getline() from std::ifstream
From:	Christian Franke <Christian DOT Franke AT t-online DOT de>
To:	cygwin AT cygwin DOT com
References:	<CAHVoUt2pHP46o6ERwx9HB5=Dn-J9xv5i-53RYtJbdev-K9DCeQ AT mail DOT gmail DOT com> <0725bdbd-0411-138a-7ea9-d6395e3256e3 AT t-online DOT de> <da63d7d5-4ccc-8171-710a-0105219888e3 AT gmail DOT com> <b4f361ca-9927-c3d4-5530-2d2fd4dfd24e AT t-online DOT de>
Message-ID:	<132567e2-8ddb-6675-1b8d-1777be1b4d99@t-online.de>
Date:	Fri, 22 Jun 2018 10:48:57 +0200
User-Agent:	Mozilla/5.0 (Windows NT 10.0; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0 SeaMonkey/2.51
MIME-Version:	1.0
In-Reply-To:	<b4f361ca-9927-c3d4-5530-2d2fd4dfd24e@t-online.de>
X-IsSubscribed:	yes

Christian Franke wrote:
> Marco Atzeri wrote:
>> On 6/12/2018 7:11 PM, Christian Franke wrote:
>>> ...
>>> The attached patch for
>>> /usr/lib/gcc/*-pc-cygwin/7.3.0/include/c++/bits/basic_string.h
>>> fixes this.
>>>

Please forget this patch. It was bases on a wrong assumption and only 
cures symptoms.


>>
>> It seems an upstream bug so could you report it there ?
>>
>
> Done:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86138
>

If build with -std=c++17, a duplicate _S_empty_rep_storage[] which 
already exists in the DLL is generated in the executable. This results 
in a false negative string.empty() test in the DLL. See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86138#c6

Workarounds:
- Link with -static, or
- Compile with -D_GLIBCXX_USE_CXX11_ABI

Fix:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=261873

Regards,
Christian


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -