Hi
I cross-compiled the latest Clementine source on my Debian Buster host 
using the latest Qt Creator and Qt 5.15.
The CMake build completes fine, but after deployment to the device and 
launch, I can see the usual clementine start messages
in the terminal, but the screen remains black.

06:53:08.470 INFO  {anonymous}:226                  Using default config 
locations.
06:53:08.480 INFO  main:321                         Clementine-qt5 1.4 rc2
06:53:08.810 DEBUG NetworkProxyFactory:49           Detected system proxy 
URLs: ("", "", "", "")
06:53:08.860 DEBUG WorkerPool<HandlerType>:281      Starting worker 
0x665fa3f8 "/usr/local/bin/clementine-tagreader" "/tmp/clementine_38528271"
06:53:08.873 DEBUG WorkerPool<HandlerType>:281      Starting worker 
0x665fa3f8 "/usr/local/bin/clementine-tagreader" "/tmp/clementine_145296994"
06:53:08.881 DEBUG WorkerPool<HandlerType>:281      Starting worker 
0x665fa3f8 "/usr/local/bin/clementine-tagreader" 
"/tmp/clementine_1320306374"
06:53:08.898 DEBUG WorkerPool<HandlerType>:281      Starting worker 
0x665fa3f8 "/usr/local/bin/clementine-tagreader" 
"/tmp/clementine_1886062845"
06:53:08.917 INFO  main:48                          TagReader worker 
connecting to "/tmp/clementine_38528271"
06:53:08.926 DEBUG WorkerPool<HandlerType>:301      Worker 0x6a4071e8 
connected to "/tmp/clementine_38528271"
06:53:08.942 INFO  main:48                          TagReader worker 
connecting to "/tmp/clementine_1320306374"
06:53:08.945 DEBUG WorkerPool<HandlerType>:301      Worker 0x6a409c88 
connected to "/tmp/clementine_1320306374"
06:53:08.949 INFO  main:48                          TagReader worker 
connecting to "/tmp/clementine_145296994"
06:53:08.952 DEBUG WorkerPool<HandlerType>:301      Worker 0x6a4087d0 
connected to "/tmp/clementine_145296994"
06:53:08.955 INFO  main:48                          TagReader worker 
connecting to "/tmp/clementine_1886062845"
06:53:08.959 DEBUG WorkerPool<HandlerType>:301      Worker 0x6a40c060 
connected to "/tmp/clementine_1886062845"
06:53:09.016 WARN  OSD:93                           Error connecting to 
notifications service.
06:53:09.022 DEBUG GnomeGlobalShortcutBackend:54    registering
06:53:09.023 WARN  GnomeGlobalShortcutBackend:70    gnome settings daemon 
not registered
06:53:09.024 DEBUG QxtGlobalShortcutBackend:37      registering
06:53:09.024 WARN  unknown                          QxtGlobalShortcut 
failed to register: "Media Next" 
06:53:09.024 WARN  unknown                          QxtGlobalShortcut 
failed to register: "Media Play" 
06:53:09.024 WARN  unknown                          QxtGlobalShortcut 
failed to register: "Media Previous" 
06:53:09.025 WARN  unknown                          QxtGlobalShortcut 
failed to register: "Media Stop" 
06:53:09.601 DEBUG MainWindow:229                   Starting
06:53:09.955 DEBUG CoverProviders:35                Registered cover 
provider "MusicBrainz"
06:53:09.955 DEBUG CoverProviders:35                Registered cover 
provider "Discogs"
06:53:09.955 DEBUG CoverProviders:35                Registered cover 
provider "last.fm"
06:53:10.066 DEBUG MainWindow:309                   Initialising player
06:53:10.093 DEBUG MainWindow:315                   Creating models
06:53:10.119 WARN  PulseDeviceFinder:51             Failed to connect 
pulseaudio context
06:53:10.123 INFO  Player:650                       Registered URL handler 
for "classicalradio"
06:53:10.124 DEBUG InternetModel:133                Adding internet service: 
"ClassicalRadio"
06:53:10.132 INFO  Player:650                       Registered URL handler 
for "di"
06:53:10.133 DEBUG InternetModel:133                Adding internet service: 
"DigitallyImported"
06:53:10.178 DEBUG InternetModel:133                Adding internet service: 
"Icecast"
06:53:10.217 DEBUG InternetModel:133                Adding internet service: 
"Jamendo"
06:53:10.224 INFO  Player:650                       Registered URL handler 
for "jazzradio"
06:53:10.225 DEBUG InternetModel:133                Adding internet service: 
"JazzRadio"
06:53:10.252 INFO  Player:650                       Registered URL handler 
for "magnatune"
06:53:10.266 DEBUG InternetModel:133                Adding internet service: 
"Magnatune"
06:53:10.312 DEBUG InternetModel:133                Adding internet service: 
"Podcasts"
06:53:10.320 INFO  Player:650                       Registered URL handler 
for "rockradio"
06:53:10.321 DEBUG InternetModel:133                Adding internet service: 
"RockRadio"
06:53:10.336 DEBUG InternetModel:133                Adding internet service: 
"SavedRadio"
06:53:10.343 INFO  Player:650                       Registered URL handler 
for "radiotunes"
06:53:10.344 DEBUG InternetModel:133                Adding internet service: 
"RadioTunes"
06:53:10.352 INFO  Player:650                       Registered URL handler 
for "somafm"
06:53:10.355 DEBUG InternetModel:133                Adding internet service: 
"SomaFM"
06:53:10.362 INFO  Player:650                       Registered URL handler 
for "intergalacticfm"
06:53:10.366 DEBUG InternetModel:133                Adding internet service: 
"Intergalactic 
FM"
06:53:10.393 DEBUG SpotifyService:108               Spotify system blob path
: "/usr/local/bin/clementine-spotifyblob"
06:53:10.393 DEBUG SpotifyService:109               Spotify local blob path: 
"/root/.config/Clementine/spotifyblob/version16-32bit/blob"
06:53:10.407 DEBUG InternetModel:133                Adding internet service: 
"Spotify"
06:53:10.407 INFO  Player:650                       Registered URL handler 
for "subsonic"
06:53:10.538 DEBUG InternetModel:133                Adding internet service: 
"Subsonic"
06:53:10.610 INFO  Player:650                       Registered URL handler 
for "box"
06:53:10.610 DEBUG InternetModel:133                Adding internet service: 
"Box"
06:53:10.643 INFO  Player:650                       Registered URL handler 
for "dropbox"
06:53:10.643 DEBUG InternetModel:133                Adding internet service: 
"Dropbox"
06:53:10.677 INFO  Player:650                       Registered URL handler 
for "googledrive"
06:53:10.677 DEBUG InternetModel:133                Adding internet service: 
"Google 
Drive"
06:53:10.710 INFO  Player:650                       Registered URL handler 
for "seafile"
06:53:10.710 DEBUG InternetModel:133                Adding internet service: 
"Seafile"
06:53:10.743 INFO  Player:650                       Registered URL handler 
for "skydrive"
06:53:10.743 DEBUG InternetModel:133                Adding internet service: 
"OneDrive"
06:53:10.759 DEBUG CddaLister:98                    No CD devices found
06:53:10.763 WARN  DeviceKitLister:55               Error enumerating 
DeviceKit-disks devices: "org.freedesktop.DBus.Error.ServiceUnknown" "The 
name org.freedesktop.UDisks was not provided by any .service files"
06:53:10.763 WARN  Udisks2Lister:152                Error enumerating 
udisks2 devices: "org.freedesktop.DBus.Error.ServiceUnknown" "The name 
org.freedesktop.UDisks2 was not provided by any .service files"
06:53:10.797 DEBUG MainWindow:333                   Creating UI
06:53:11.036 WARN  IconLoader:117                   Couldn't load icon 
"system-search"
06:53:11.036 WARN  IconLoader:117                   Couldn't load icon 
"system-search"
06:53:11.080 DEBUG MainWindow:882                   Creating equalizer
06:53:11.081 DEBUG MainWindow:911                   Creating now playing 
widget
06:53:11.294 DEBUG Playlist:173                     k_max_scrobble_point 240
06:53:11.346 DEBUG MainWindow:977                   Loading settings
06:53:11.353 INFO  NetworkRemote:85                 Network Remote 
deactivated
06:53:11.371 WARN  unknown                          Attribute 
Qt::AA_ShareOpenGLContexts 
must be set before QCoreApplication is created. 
06:53:11.925 DEBUG MainWindow:2219                  command line options 
received
06:53:11.925 DEBUG MainWindow:1065                  Started
06:53:11.953 INFO  DeviceManager:355                Device added: 
"Gio//ext3/ext4/15383740416"
06:53:11.954 WARN  IconLoader:48                    Icon name is null
06:53:11.954 WARN  IconLoader:48                    Icon name is null
06:53:11.954 WARN  IconLoader:48                    Icon name is null
06:53:11.961 INFO  DeviceManager:355                Device added: 
"Gio//msdos/264289280"
06:53:11.962 WARN  IconLoader:48                    Icon name is null
06:53:11.962 WARN  IconLoader:48                    Icon name is null
06:53:11.962 WARN  IconLoader:48                    Icon name is null
06:53:11.968 INFO  DeviceManager:355                Device added: 
"Gio//proc/0"
06:53:11.968 WARN  IconLoader:48                    Icon name is null
06:53:11.968 WARN  IconLoader:48                    Icon name is null
06:53:11.969 WARN  IconLoader:48                    Icon name is null
06:53:12.303 WARN  unknown                          QOpenGLShaderProgram: 
could not create shader program 
06:53:12.304 WARN  unknown                          QOpenGLShader: could not 
create shader 
06:53:12.304 WARN  unknown                          Could not link shader 
program: 
06:53:12.304 WARN  unknown                           "" 
06:55:02.752 DEBUG Database:605                     Starting database 
integrity check
06:55:02.764 DEBUG Database:666                     Starting database backup

Cross-built Qt examples using OpenGL ES2.0 are running on the device, and I 
have checked via ldd that the clementine binary finds the correct
broadcom version of the GLESv2 library.

Not sure what I need to make of the warning:

06:53:11.371 WARN  unknown                          Attribute 
Qt::AA_ShareOpenGLContexts 
must be set before QCoreApplication is created. 
06:53:11.925 DEBUG MainWindow:2219                  command line options 
received

Any help solving this would be appreciated~
Thanks!!


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