Am 26.04.2020 um 15:54 schrieb Yaakov Selkowitz:
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Good idea, since Qt4 is obsolete and unmaintained (both upstream and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).
side effect of the python 2 to 3 transfer
but is is still QT4 oriented
https://wiki.lyx.org/LyX/Dependecies
"LyX 2.3.x series need Qt >= 4.8, widely tested with 4.8. For Qt 5 we
suggest Qt 5.6 (widely tested). "
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.
thanks.
With Cygserver those are gone.
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
Thanks.
In the meantime I found a solution.
Removed the old .startxwinrc and the problem is gone.
Maybe something changed in one of the last release of X
that make the old file not anymore compatible.
Test version with QT5 and python 3 (3.6 for the time being) on the way
Regards
Marco
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