Hi Andrea, glad to hear you have things compiling at least.
A couple of pieces of advice to get started.
1. If possible can you simply use static linking? It would simplify
things greatly and reduce code size. Unless you program is very much
based on around the idea of dlopen/dlsym I would strongly recommend
avoiding dynamic linking.
2. If you must use `-sMAIN_MODULE` then I strongly recommend using
`-sMAIN_MODULE=2`. In this mode you pass your side module on the command
line when linking the main module and emscripten can then figure out
precisely what symbols it needs to include.
3. You don't need/want `-sSTANDALONE_WASM` when building your side module
(in fact I think you probably don't need most of the link flags you have
there).
If you do need dynamic linking and your problem persists then I suggest
taking a look your main module and your side module using something like
`wasm-objdump` to figure out what the signature of the
`_ZNSt3__26chrono12steady_clock3nowEv` symbol on the import side (the side
module) and the export side (the main module).
That symbol is `std::__2::chrono::steady_clock::now()` BTW. It looks like
its is always support to return a `class time_point` which itself that
simply contains a `calss duration` which seems to be templatized so I
suppose its size could vary? I'm not sure yet, that could be the issue I
suppose. Again static linking is probably way to go.
cheers,
sam
On Sat, Jun 29, 2024 at 2:00 PM 'Andrea M' via emscripten-discuss <
emscripten-discuss@googlegroups.com> wrote:
> Hi,
>
> After days of hard work I finally worked out how to compile
> maplibre-native as a WASM side module, roughly 40MB (without
> optimisations). At the moment the file size doesn't worry me much.
>
> maplibre-native is compiled using C++ 17 whereas my main module is
> compiled using C++ 23. Is this generally allowed? Might this be why I'm
> getting:
>
> LinkError: WebAssembly.instantiate(): Import #7289 "env"
> "_ZNSt3__26chrono12steady_clock3nowEv": imported function does not match
> the expected type
>
> Please note, I am using CMake.
>
> # SIDE_MODULE
> set(CMAKE_EXECUTABLE_SUFFIX ".wasm")
>
> set_target_properties(mbgl-core PROPERTIES COMPILE_FLAGS "-O0 -pthread
> -fPIC --use-port=libpng --use-port=libjpeg --use-port=zlib
> --use-port=sqlite3 -s DISABLE_EXCEPTION_CATCHING=0
> -DEMSCRIPTEN_HAS_UNBOUND_TYPE_NAMES=0 -DMLN_RENDER_BACKEND_OPENGL
> -DMLN_DRAWABLE_RENDERER")
>
> set_target_properties(mbgl-core PROPERTIES LINK_FLAGS "--no-heap-copy
> -pthread -fPIC --use-port=libpng --use-port=libjpeg --use-port=zlib
> --use-port=sqlite3 -O0 -lembind -lhtml5.js -lhtml5_webgl.js -lglfw.js -s
> ENVIRONMENT='web,worker' -s ALLOW_MEMORY_GROWTH=1 -s WASM=1 -s USE_GLFW=3
> -s USE_WEBGPU=1 -s STANDALONE_WASM=1 -s ASSERTIONS=1 -s
> STACK_OVERFLOW_CHECK=2 -s MIN_WEBGL_VERSION=2 -s MAX_WEBGL_VERSION=2
> -sFULL_ES3 -s EXPORT_ALL=1 -s DISABLE_EXCEPTION_CATCHING=0 -s SINGLE_FILE=0
> -sSIDE_MODULE")
>
>
> # MAIN MODULE
> set_target_properties(reactDearImgui PROPERTIES COMPILE_FLAGS "-O3
> -pthread -fPIC -Wno-error=deprecated-declarations -Wformat -s
> DISABLE_EXCEPTION_CATCHING=0 --use-port=libpng --use-port=sqlite3
> --use-port=libjpeg --use-port=zlib")
>
> set_target_properties(reactDearImgui PROPERTIES LINK_FLAGS "--no-heap-copy
> -pthread -fPIC --use-port=sqlite3 --use-port=libpng --use-port=libjpeg
> --use-port=zlib -O3 -lembind -lhtml5.js -lhtml5_webgl.js -lglfw.js -s
> DISABLE_EXCEPTION_CATCHING=0 -s ENVIRONMENT='web,worker' -s MODULARIZE=1 -s
> ALLOW_MEMORY_GROWTH=1 -s WASM=1 -s USE_GLFW=3 -s USE_WEBGPU=1 -s
> NO_EXIT_RUNTIME=0 -s STANDALONE_WASM=0 -s EXIT_RUNTIME=1 -s ASSERTIONS=1 -s
> STACK_OVERFLOW_CHECK=2 -s MIN_WEBGL_VERSION=2 -s MAX_WEBGL_VERSION=2
> -sFULL_ES3 -s DISABLE_EXCEPTION_CATCHING=0 -s SINGLE_FILE=0
> -sERROR_ON_UNDEFINED_SYMBOLS=0 -s EXPORT_ALL=1 -sMAIN_MODULE
> ${CMAKE_CURRENT_SOURCE_DIR}/deps/maplibre-native-fork/platform/emscripten/build/mbgl-core.wasm")
>
> Any help with this would be greatly appreciated. I apologise in advance if
> the solution turns out to be trivial.
>
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