Could not create scene graph context for backend 'epaper' - check that plugins are installed correctly in /usr/lib/plugins

[Eeems]

Describe the bug Error Could not create scene graph context for backend 'epaper' - check that plugins are installed correctly in /usr/lib/plugins is raised before a segfault when running tarnish.

To Reproduce Steps to reproduce the behavior:

1. Install v2.8 or v2.8.1
2. Try to run rm2fb-client tarnish --break-lock
3. See error

Expected behavior Should not error and should instead run as expected.

Screenshots N/A

Version Information:

• Device: reMarkable 2
• OS: 2.15.1.1189
• Version: v2.8 or v2.8.1

Additional context N/A

[Eeems]

Upon running with QT_DEBUG_PLUGINS=1, it does load /usr/lib/plugins/platforms/libepaper.so as expected. This is probably something to do with the change to how qsgepaper and epaper are handled in the build.

[Eeems]

libqsgepaper.so is being stored in /opt/lib, but doesn't appear to be loaded in time? Trying to load it manually with LD_PRELOAD=/opt/lib/libqsgepaper.so has the following error:

/usr/bin/env: symbol lookup error: /opt/lib/libqsgepaper.so: undefined symbol: _ZTI11QSGBindable

[Eeems]

Upon inspecting the required libraries, tarnish depends on liboxide.so, but that does not require libqsgepaper.so. This might be why it's failing to load.

[Eeems]

Adding the dependency for libqsgepaper.so to liboxide.so doesn't fix this. My current guess is that https://github.com/Eeems-Org/oxide/blob/fe74eb8ed3640b642a666026d69ab32ac4ceb333/shared/liboxide/epaper.h isn't doing what I expect with declaring the plugin.

[Eeems]

Running the code in debug or release mode from qt creator works without issue. This appears to be an issue with the build done with the toltec toolchain.

[Eeems]

The code to replace linux-oe-g++ with linux-arm-remarkable-g++ was missing the epaper.pri file.