Example LV2 plugins freeze LV2 hosts Ardour and Carla when trying to show plugin's GUI

[jmaibaum]

On an up-to-date Arch Linux (2020-07-05), and using the dev/v1.0.7 branch, the Example LV2 plugins created by the camomile scripts freeze the LV2 hosts Ardour 6.0 and Carla as soon as the in-plugin GUI is being loaded.

Info about the Ardour and Carla versions installed on my system:

$ LANG= yay -Si ardour carla
Repository      : community
Name            : ardour
Version         : 6.0-2
Description     : Professional-grade digital audio workstation
Architecture    : x86_64
URL             : https://ardour.org/
Licenses        : GPL2
Groups          : pro-audio
Provides        : None
Depends On      : atkmm  cairo  cairomm  fontconfig  gdk-pixbuf2  gcc-libs  glibc  glibmm  gtkmm  libx11  libxml2  pangomm  taglib
                  libFLAC.so=8-64  libasound.so=2-64  libatk-1.0.so=0-64  libaubio.so=5-64  libarchive.so=13-64  libcurl.so=4-64
                  libdbus-1.so=3-64  libfftw3f.so=3-64  libfftw3f_threads.so=3-64  libfreetype.so=6-64  libgdk-x11-2.0.so=0-64
                  libgio-2.0.so=0-64  libglib-2.0.so=0-64  libgobject-2.0.so=0-64  libgtk-x11-2.0.so=0-64  libharfbuzz.so=0-64  liblo.so=7-64
                  liblrdf.so=2-64  liblilv-0.so=0-64  libogg.so=0-64  libpango-1.0.so=0-64  libpangocairo-1.0.so=0-64  libpangoft2-1.0.so=0-64
                  libpulse.so=0-64  libreadline.so=8-64  librubberband.so=2-64  libsamplerate.so=0-64  libserd-0.so=0-64  libsndfile.so=1-64
                  libsord-0.so=0-64  libsratom-0.so=0-64  libsuil-0.so=0-64  libusb-1.0.so=0-64  libvamp-hostsdk.so=3-64  libvamp-sdk.so=2-64
                  libwebsockets.so=16-64
Optional Deps   : xjadeo: video monitoring
                  harvid: video timeline
                  non-session-manager: for session management
Conflicts With  : None
Replaces        : None
Download Size   : 13.64 MiB
Installed Size  : 73.28 MiB
Packager        : David Runge <dave@sleepmap.de>
Build Date      : Tue May 26 21:41:17 2020
Validated By    : MD5 Sum  SHA-256 Sum  Signature

Repository      : community
Name            : carla
Version         : 2.1.1-1
Description     : Audio Plugin Host
Architecture    : x86_64
URL             : https://kxstudio.linuxaudio.org/Applications:Carla
Licenses        : GPL2
Groups          : pro-audio
Provides        : None
Depends On      : gcc-libs  glibc  libglvnd  libx11  python-pyqt5  python-pyliblo  python-rdflib  qt5-base  qt5-svg  libasound.so
                  libfluidsynth.so=2-64  libgdk-3.so=0-64  libgdk-x11-2.0.so=0-64  libgobject-2.0.so=0-64  libglib-2.0.so=0-64
                  libgtk-3.so=0-64  libgtk-x11-2.0.so=0-64  liblo.so=7-64  libmagic.so=1-64  libpulse.so  libpulse-simple.so
                  libsndfile.so=1-64
Optional Deps   : None
Conflicts With  : None
Replaces        : None
Download Size   : 4.80 MiB
Installed Size  : 35.28 MiB
Packager        : David Runge <dvzrv@archlinux.org>
Build Date      : Thu Jun 11 17:13:46 2020
Validated By    : MD5 Sum  SHA-256 Sum  Signature

[KottV]

looks like it cannot initialize ParentUI

there is fork based on old but working code, with help by @osxmidi it works with JUCE6 https://github.com/lv2-porting-project/JUCE/tree/lv2

[pierreguillot]

This is fixed on dev/imp-compilation. Here are the screenshot on Ardour and Carla on Ubuntu (using virtual box).