Arch Linux

Can confirm that the drag&drop doesn't work anymore on QT 5.12. Can't get it to crash however.

==> Software upgrade (new version) :
extra/qt5-base 5.11.2-3 -> 5.12.0-1
extra/qt5-location 5.11.2-2 -> 5.12.0-1

Building fails too:

[ 50%] Building CXX object CMakeFiles/RemoteVstPlugin64.dir/home/justas/builds/lmms/plugins/vst_base/RemoteVstPlugin.cpp.o
Scanning dependencies of target zynaddsubfx_nio
[ 50%] Building CXX object CMakeFiles/RemoteVstPlugin32.dir/home/justas/builds/lmms/plugins/vst_base/RemoteVstPlugin.cpp.o
[ 66%] Generating VirKeyboard.h
In file included from /home/justas/builds/lmms/include/MidiEvent.h:28,
from /home/justas/builds/lmms/include/RemotePlugin.h:28,
from /home/justas/builds/lmms/plugins/vst_base/RemoteVstPlugin.cpp:35:
/usr/include/c++/8.2.1/cstdlib:75:15: fatal error: stdlib.h: No such file or directory
#include_next <stdlib.h>
^~~~~~~~~~
compilation terminated.
winegcc: g++ failed
make[5]: *** [CMakeFiles/RemoteVstPlugin64.dir/build.make:63: CMakeFiles/RemoteVstPlugin64.dir/home/justas/builds/lmms/plugins/vst_base/RemoteVstPlugin.cpp.o] Error 2
make[4]: *** [CMakeFiles/Makefile2:73: CMakeFiles/RemoteVstPlugin64.dir/all] Error 2
make[3]: *** [Makefile:84: all] Error 2
make[2]: *** [plugins/vst_base/CMakeFiles/RemoteVstPlugin64.dir/build.make:111: plugins/vst_base/RemoteVstPlugin64-prefix/src/RemoteVstPlugin64-stamp/RemoteVstPlugin64-build] Error 2
make[1]: *** [CMakeFiles/Makefile2:8039: plugins/vst_base/CMakeFiles/RemoteVstPlugin64.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
In file included from /home/justas/builds/lmms/include/MidiEvent.h:28,
from /home/justas/builds/lmms/include/RemotePlugin.h:28,
from /home/justas/builds/lmms/plugins/vst_base/RemoteVstPlugin.cpp:35:
/usr/include/c++/8.2.1/cstdlib:75:15: fatal error: stdlib.h: No such file or directory
#include_next <stdlib.h>
^~~~~~~~~~
compilation terminated.
winegcc: g++ failed
make[5]: *** [CMakeFiles/RemoteVstPlugin32.dir/build.make:63: CMakeFiles/RemoteVstPlugin32.dir/home/justas/builds/lmms/plugins/vst_base/RemoteVstPlugin.cpp.o] Error 2
make[4]: *** [CMakeFiles/Makefile2:73: CMakeFiles/RemoteVstPlugin32.dir/all] Error 2
make[3]: *** [Makefile:84: all] Error 2
make[2]: *** [plugins/vst_base/CMakeFiles/RemoteVstPlugin32.dir/build.make:111: plugins/vst_base/RemoteVstPlugin32-prefix/src/RemoteVstPlugin32-stamp/RemoteVstPlugin32-build] Error 2
make[1]: *** [CMakeFiles/Makefile2:8076: plugins/vst_base/CMakeFiles/RemoteVstPlugin32.dir/all] Error 2
[ 66%] Building CXX object plugins/Xpressive/CMakeFiles/xpressive.dir/ExprSynth.cpp.o

I am able to build LMMS without encountering the stdlib.h error by downgrading to an earlier version of Wine (wine-3.20-1-x86_64.pkg.tar.xz). Unsure where the boundary between can compile and won't stands here.

I am still unable to drag & drop instruments on the self-built version.
QT is extra/qt5-base 5.12.0-1 (qt qt5)

./lmms -v
LMMS 1.2.0-rc7.391
(Linux x86_64, Qt 5.12.0, GCC 8.2.1 20181127)

Compiling with -DWANT_VST=OFF gets rid of Vestige & the winegcc errors but the broken drag & drop still persists.

I can also confirm that click and drag is broken.

Encoutnered this post today: https://lmms.io/forum/viewtopic.php?f=7&t=29580
I did not try the linked AppImage, but it is also linked form the official download site: https://lmms.io/download/#linux

@ion203: Thanks for reporting! For the future: Please provide a more useful bug title (e.g. drag & drop fails with qt > 5.12). All in all I think this is more of an incompatibility issue, that should be tracked upstream.
@SSStormy: As you provided a bug report upstream [1] regarding the qt > 5.12 problem already, it would be nice if you could link to it, so people can actually track it here.
The Wine/VST problem seems to be a separate issue. Care to open a bug report for that as well? That would be great, as it will take me some time to get onto this (currently on family holiday).

@jonnyDumb: That's not relevant for this issue.

[1] https://github.com/LMMS/lmms/issues/4738

Confirmed: Drag & Drop broken, which renders the program virtually useless!!

WORKAROUND:
From what I gather from github, it should be compiled with Qt 5.11. I downloaded their released App Image and it works for me.

Also, somebody forked it and maybe they got it to work with the latest version of Qt, but I didn't test that.

signing off from Artix Linux LXQT

@cubetronic: Well, your comment is also virtually useless, as it adds no valuable information (the app image is irrelevant for this report, qt is in 5.12 in the repos, therefore we will not build against 5.11 and the fork is utter nonesense as well, as it promotes qt4(!) over qt5).
Additionally, please refrain from writing e-mails to me about this matter with the same information as in this bug report (especially right after posting here). The only thing this speeds up for you is ending up in my e-mail kill file.


In case anyone's interested in reading into the background (to actually help fix it), there's a lengthy forum discussion [1] and at least one bug report [2] regarding this, mentioned in the lmms bug report.

There's currently not much to do about it, as lmms hasn't figured out a (complete) fix for this either.

[1] https://forum.qt.io/topic/97649/bug-in-qt-5-12-drag-n-drop
[2] https://bugreports.qt.io/browse/QTBUG-72844?jql=project%20%3D%20QTBUG%20AND%20component%20%3D%20%22GUI%3A%20Drag%20and%20Drop%22%20AND%20affectedVersion%20%3E%3D%205.12.0%20ORDER%20BY%20created%20DESC

As noted upstream, there seems to be a pull request for qt5 regarding this problem [1], that will hopefully land in 5.12.1.

[1] https://codereview.qt-project.org/#/c/249086/

@ion203: I believe the crash with the vestige host is unrelated to the drag&drop issue. Please report it upstream.

@ion203, SSStormy: Additionally, I can not reproduce the build issues you're having with lmms. I assume you're not using a clean chroot to build the package.
Please try again with devtools [1] and do a `multilib-build -c` in the directory with the PKGBUILD.

[1] https://www.archlinux.org/packages/extra/any/devtools/

@ion203: I have rebuilt against current wine and qt5 [1]. Can you please check, whether the vestige related crash still happens for you with that version? Note: This will of course not fix the drag&drop problems you're experiencing!

[1] https://www.archlinux.org/packages/community-testing/x86_64/lmms/

@dvzrv attached build.log.xz failure from using multilib-build -c with mirror /etc/pacman.d/mirrorlist set to
Server=https://archive.archlinux.org/repos/2018/12/13/$repo/os/$arch
the date SSStormy stated encountering a build failure. This build is for lmms 1.2.0rc7-2 the same failure can be produced with the PKGBUILD for lmms 1.2.0rc7-1
Appears the issue self resolved between their tests and yours and was not related to use of a clean chroot.

The VST seg fault doesn't occur with the package built from QT 5.12, so that aspect is fine.

Please test qt5-base 5.12.0-2

as reported in the (duplicate, sorry)  FS#61283 , the problem is not here with the AUR package lmms-beta-bin that use the same version of LMMS. It also depend on qt5-base.

lmms-beta-bin is a repackaged appimage that uses a bundled copy of Qt so the fact that is works is completely irrelevant. Again, please test 5.12.0-2

I can confirm that everything seems to work after updating to qt5-base 5.12.0-2