X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BE8F13938C0D
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1587909294;
	bh=IDO4ZchyCIbHvtmBaTbFcXG5y48FP/Wq50aj9W2OM7s=;
	h=Subject:From:To:Date:In-Reply-To:References:List-Id:
	 List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:
	 From;
	b=n+3XCPDHxUJUbfDL9VLYW6UgUf/dgVJ+24LgomB9oxWIQgAVitC522m+NbCmdI/3L
	 +N0ZDWNBsWxOQSFHSbDlbEuzveWc1EAc/Tine+LftzJ8RFUUlQnchJ+qpGsOeRxsg2
	 GYoqfNokwKdWjTqrTpElInjKN93r6uOdxxRPXpSM=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 39163385DC1B
Authentication-Results: sourceware.org;
 dmarc=none (p=none dis=none) header.from=cygwin.com
Authentication-Results: sourceware.org;
 spf=fail smtp.mailfrom=yselkowitz AT cygwin DOT com
X-MC-Unique: iJs_eJx5NRSSkwGyLt-5gg-1
Message-ID: <a43230146e2d90a484413385362bad10e832227d.camel@cygwin.com>
Subject: Re: lyx and QT5 blank windows
From: Yaakov Selkowitz <yselkowitz AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Date: Sun, 26 Apr 2020 09:54:45 -0400
In-Reply-To: <ab6eeb15-ce54-e593-1cef-b4621b72fd4c@gmail.com>
References: <ab6eeb15-ce54-e593-1cef-b4621b72fd4c AT gmail DOT com>
User-Agent: Evolution 3.34.4 (3.34.4-1.fc31)
MIME-Version: 1.0
X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12
X-Mimecast-Spam-Score: 0
X-Mimecast-Originator: cygwin.com
X-Spam-Status: No, score=-7.8 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS,
 RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NEUTRAL,
 TXREP autolearn=no autolearn_force=no version=3.4.2
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <http://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <http://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
Content-Type: text/plain; charset="utf-8"
Errors-To: cygwin-bounces AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces AT cygwin DOT com>
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from base64 to 8bit by delorie.com id 03QDtLRr002961

On Sun, 2020-04-26 at 11:15 +0200, Marco Atzeri via Cygwin wrote:
> I am trying to rebuild lyx with QT5 enabled instead of QT4.

Good idea, since Qt4 is obsolete and unmaintained (both upstream and
downstream).

> The build is fine and it seems to start fine, but opening new windows 
> like "open file" only produces a blank and black window.
> 
> At running I see only this output, that is not clear if it is related
> 
> QXcbShmImage: shmget() failed (88: Function not implemented) for size 
> 1407600 (690x510)
> QXcbShmImage: shmget() failed (88: Function not implemented) for size 
> 518976 (318x408)
> Gtk-Message: GtkDialog mapped without a transient parent. This is 
> discouraged.
> QXcbShmImage: shmget() failed (88: Function not implemented) for size 
> 12000 (100x30)

Do you have cygserver running, and was it started before the X server? 
This is a requirement for the MIT-SHM extension, otherwise you need to
set QT_X11_NO_MITSHM=1 in your environment.

> and at build time there is a new warning coming from the compiler
> 
> /usr/include/qt5/QtGui/qtransform.h: In member function ‘QTransform& 
> QTransform::operator=(QTransform&&)’:
> /usr/include/qt5/QtGui/qtransform.h:81:46: warning: ‘void* memcpy(void*, 
> const void*, size_t)’ writing to an object of type ‘class QTransform’ 
> with no trivial copy-assignment; use copy-assignment or 
> copy-initialization instead [-Wclass-memaccess]
>     81 |     { memcpy(this, &other, sizeof(QTransform)); return *this; }
>        |                                              ^

I think this can be ignored for now, and will likely be fixed by a
future update to qt5.

--
Yaakov


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