Using qmake subprojects with WebAssembly

[realwernerrammer]

Hi,
I am trying to compile an existing program to Wasm. The code consists of a main executable and some "plugins" which are built using the "subdirs" template.
For "normal" targets (Linux, Windows) I include the "plugins" in the .pro file of the project.

Now for Wasm, the compiler tells me:

error: undefined symbol: _Z27qt_static_plugin_FirePluginv (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: __Z27qt_static_plugin_FirePluginv may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _Z27qt_static_plugin_WindPluginv (referenced by top-level compiled C/C++ code)
warning: __Z27qt_static_plugin_WindPluginv may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
error: undefined symbol: _Z33qt_static_plugin_BarkBeetlePluginv (referenced by top-level compiled C/C++ code)
warning: __Z33qt_static_plugin_BarkBeetlePluginv may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors

Is there a way to include these modules also for WASM?

This is how it looks like for windows in the .pro file:

win32-msvc*:{
#release msvc

PRE_TARGETDEPS += ../plugins/iland_fire.lib
PRE_TARGETDEPS += ../plugins/iland_wind.lib
PRE_TARGETDEPS += ../plugins/iland_barkbeetle.lib
LIBS += -L../plugins -liland_fire -liland_wind -liland_barkbeetle
}
}

I am using Qt6.5.2, emscripten 3.1.25, Ubuntu 20.4.

Any help is appreciated!