Question: how do I build this project for WebAssembly

[The0Dev]

Hello. I wonder if it's possible to compile this example for WebAssembly.

Apparently, it's possible to use GDExtension on the web when building with Scons but I struggle to make it work with CMake

I can export my main project for web with Godot but when it loads it says:

ERROR: No GDExtension library found for current OS and architecture (web.wasm32) in configuration file: res://GDExtensionTemplate.gdextension

I tried to build the example using Emscripten and the following commands:

./emcmake cmake -S /home/user/GDExtensionTemplate -B /home/user/GDExtensionTemplate-build-web -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-sSIDE_MODULE -fPIC -msimd128 -std=c++17 -sNO_DISABLE_EXCEPTION_CATCHING -o3 -pthread --target=wasm32-unknown-emscripten" -DCMAKE_C_FLAGS="-fPIC" -DCMAKE_EXE_LINKER_FLAGS="-pthread -sINITIAL_MEMORY=104857600 -sALLOW_MEMORY_GROWTH=1"

./emmake make -C /home/user/GDExtensionTemplate-build-web -j 4

However, I got the following warning from CMake and it built a static library instead (GDExtensionTemplate.a)

ADD_LIBRARY called with SHARED option but the target platform does not
support dynamic linking

I would appreciate some help

[The0Dev]

I've had some progress resolving this issue by doing this:
emscripten-core/emscripten#15276 (comment)

It now builds a .so library that I can specify in the .gdextension file

[libraries]
web.wasm32 = "lib/Emscripten-x86/libGDExtensionTemplate.so"

However, at link time I get warnings like this:

wasm-ld: warning: function signature mismatch: _ZNK5godot4Mesh21_surface_get_materialEi
defined as () -> void in extern/godot-cpp/bin/libgodot-cpp.emscripten.release.32.a(mesh.cpp.o)
defined as (i32, i32, i32) -> void in lto.tmp

And in my browser I get a similar error:

Uncaught (in promise) LinkError: imported function 'env.strtoull' signature mismatch

I tried to solve this by specifying -flto/-fno-lto flags everywhere I could and clearing cache but it seems like it had no effect.