On Sat, Jun 29, 2024 at 3:08 PM 'Andrea M' via emscripten-discuss <
emscripten-discuss@googlegroups.com> wrote:
> Hi Sam,
>
> Thanks for the prompt reply - on a Saturday on top of that.
>
> To clarify, you mean I should use the -shared flag when building the side
> module?
>
No. `-shared` doesn't build side modules today.
My main advice is to avoid dynamic linking completely and use static
linking. i.e. use `.a` archives rather than a side module.
Failing that, use `-sMAIN_MODULE=2` which at least gives you dead code
elimination.
> Apologies for the dull question.
>
> Best,
> Andrea
>
> On Sat, 29 Jun 2024, 23:54 'Sam Clegg' via emscripten-discuss, <
> emscripten-discuss@googlegroups.com> wrote:
>
>> 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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>>>
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