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Good idea, since Qt4 is obsolete and unmaintained (both upstream and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