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	Sun, 26 Apr 2020 02:15:20 -0700 (PDT)
Subject:	lyx and QT5 blank windows
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID:	<ab6eeb15-ce54-e593-1cef-b4621b72fd4c@gmail.com>
Date:	Sun, 26 Apr 2020 11:15:18 +0200
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From:	Marco Atzeri via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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I am trying to rebuild lyx with QT5 enabled instead of QT4.

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)

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; }
       |                                              ^

Anyone had similar problem with other programs ?

Regards
Marco
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