[Interest] QML plugin with wasm not building

[Konstantin Shegunov]

Me again. If it matters, the exact diagnostics is as follows:

On Mon, Feb 13, 2023 at 10:22 AM Konstantin Shegunov <kshegunov at gmail.com>
wrote:

> `qt_register_pluginXXX` (or something of this sort).
>

Here's what emscripten reports:

error: undefined symbol: _Z31qt_static_plugin_XXX_UiPluginv (referenced by
top-level compiled C/C++ code)
warning: Link with `-sLLD_REPORT_UNDEFINED` to get more information on
undefined symbols
warning: To disable errors for undefined symbols use
`-sERROR_ON_UNDEFINED_SYMBOLS=0`
warning: __Z31qt_static_plugin_XXX_UiPluginv may need to be added to
EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors

If I don't use  `PLUGIN_TARGET xxx`, instead I get a cmake warning and the
runtime says the plugin can't be loaded:
---/qtbase/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake:2821 (message):
  The qml plugin 'xxx-uiplugin' is a dependency of 'xxx', but the link
  target it defines (xxx-uiplugin) does not exist in the current scope.
  The plugin will not be linked.
Call Stack (most recent call first):
  ---/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:640
(qt6_import_qml_plugins)
  ---/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:640 (cmake_language)
  ---/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:705
(_qt_internal_finalize_executable)
  ---/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:562:EVAL:1
(qt6_finalize_target)
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