I can't use the standard library in my dynamic side module no matter what I do, MAIN_MODULE=1 freezes the game.

Comienza reproduciendo el fallo del side module dinámico con el comando de enlace em++ proporcionado, MAIN_MODULE=2, SIDE_MODULE=2 y el error reportado de un símbolo de la biblioteca estándar. Compara ese resultado con MAIN_MODULE=1 y aísla un caso mínimo de enlace dinámico; se considerará terminado cuando se identifique un defecto reproducible de Emscripten o una limitación de configuración documentada.

So in my game, I load code dynamically through shared objects. I look up symbols dynamically via function names defined in a JSON file. Then once I have a generic function pointer, I cast it to the correct function pointer.

I compile my game code using MAIN_MODULE=2 and the side modules using SIDE_MODULE=2 to reduce dead code. All my functions that are loaded by the main module dynamically through the dlopen family of functions explicitly kept alive C symbols.

Aborted(Assertion failed: undefined symbol '_ZNSt12length_errorD1Ev'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) [Vivescence.js:2655:6](http://localhost:6931/Vivescence.js)
error loading dynamic library Data/DataPack/Module/VivescenceModule.wasm: RuntimeError: unreachable executed [Vivescence.js:8158:8](http://localhost:6931/Vivescence.js)
�[31m[Default Error] �[00m�[35mSource\Data\Module.cpp�[00m �[36mModule:16�[00m Condition �[33m!shared_object�[00m is true. �[33mFailed loading Data/DataPack/Module/VivescenceModule.wasm: could not load dynamic lib: Data/DataPack/Module/VivescenceModule.wa�[00m Executing statement �[32mreturn;�[00m [Vivescence.js:4567:12](http://localhost:6931/Vivescence.js)
�[31m[Default Error] �[00m�[35mSource\Data\Registry\ModuleRegistry.cpp�[00m �[36mregister_module:14�[00m Condition �[33m!module->is_valid()�[00m is true. Executing statement �[32mreturn;�[00m

I did what it said and tried that env thing. It didn't fix anything. I tried removing std vector stuff. Then it complains about the function used for the new operator... which makes no sense because obviously I use the new operator in my main game.

Ok, so MAIN_MODULE=2 doesn't work because it can't find the symbols for standard library stuff. So I try with MAIN_MODULE=1 and it just does this forever.

Freezes the entire tab and never starts the game.

Version of emscripten/emsdk:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 6.0.8 (aeb67926e7de656da38bc807d83050af93578758)
clang version 24.0.0git (https:/github.com/llvm/llvm-project 4bfd08c2d769736841ae4f5705d76fa6daa39027)

Failing command line in full:
If this is compile or link-time failure please include the full failing command
along with its entire output.

Full link command and output with -v appended:
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Adding -v to the link command will show all of the sub-commands run which
can help us diagnose your issue.

C:\Users\firec\Files\vivescence>scons platform=web
scons: Reading SConscript files ...
TOOLS loaded: ['gcc', 'g++', 'gnulink', 'ar']
File created at: C:\Users\firec\Files\vivescence\Source\Generated\BuildInfo.gen.cpp
CCFLAGS: ['-s', 'USE_PTHREADS=1', '-fwasm-exceptions', '-sUSE_FREETYPE=1', '-sUSE_HARFBUZZ=1', '-fPIC']
CXXFLAGS:
LINKFLAGS: ['-s WASM=1', '-s', 'USE_PTHREADS=1', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'PTHREAD_POOL_SIZE=Math.min(Math.max(parseInt(navigator.hardwareConcurrency),4),32)', '-s', 'ENVIRONMENT=web', '-s', 'EXPORTED_FUNCTIONS=_main', '-s', 'EXPORTED_RUNTIME_METHODS=requestFullscreen,ccall,cwrap', '-sMIN_WEBGL_VERSION=2', '-sMAX_WEBGL_VERSION=2', '-sGL_ASSERTIONS=1', '-sFORCE_FILESYSTEM=1', '-sFETCH=1', '-sUSE_FREETYPE=1', '-sUSE_HARFBUZZ=1', '-sMAIN_MODULE=2', '-fPIC', '-lidbfs.js', '--preload-file', 'C:\\Users\\firec\\Files\\vivescence/Build/Data@Data', '-fwasm-exceptions', '-sSTACK_SIZE=262144', '--shell-file', 'C:\\Users\\firec\\Files\\vivescence\\EmscriptenShell.html', '-gsource-map', '-sASSERTIONS=2', '-lwebsocket.js']
TOOLS loaded: ['gcc', 'g++', 'gnulink', 'ar']
Platform: win32
MSVC flag: None
emcmake cmake -B C:\Users\firec\Files\vivescence\CMake\Build -G Ninja -DPLATFORM=web -DCMAKE_C_FLAGS="-s USE_PTHREADS=1 -fwasm-exceptions -sUSE_FREETYPE=1 -sUSE_HARFBUZZ=1 -fPIC" -DCMAKE_CXX_FLAGS="" -DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=OFF -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -G Ninja
emcmake: cmake -B 'C:\Users\firec\Files\vivescence\CMake\Build' -G Ninja -DPLATFORM=web '-DCMAKE_C_FLAGS=-s USE_PTHREADS=1 -fwasm-exceptions -sUSE_FREETYPE=1 -sUSE_HARFBUZZ=1 -fPIC' -DCMAKE_CXX_FLAGS= -DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=OFF -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -G Ninja '-DCMAKE_TOOLCHAIN_FILE=C:\Users\firec\Files\emsdk-main\upstream\emscripten\cmake\Modules\Platform\Emscripten.cmake' '-DCMAKE_CROSSCOMPILING_EMULATOR=C:\Users\firec\Files\emsdk-main/node/24.19.0_64bit/node.exe' in directory C:\Users\firec\Files\vivescence
-- -DPLATFORM=web;-DCMAKE_C_COMPILER=C:/Users/firec/Files/emsdk-main/upstream/emscripten/emcc.exe;-DCMAKE_CXX_COMPILER=C:/Users/firec/Files/emsdk-main/upstream/emscripten/em++.exe;-DCMAKE_C_FLAGS=-s USE_PTHREADS=1 -fwasm-exceptions -sUSE_FREETYPE=1 -sUSE_HARFBUZZ=1 -fPIC;-DCMAKE_CXX_FLAGS=;-DCMAKE_BUILD_TYPE=Debug;-DBUILD_SHARED_LIBS=OFF;-DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded;-DCMAKE_TOOLCHAIN_FILE=C:\Users\firec\Files\emsdk-main\upstream\emscripten\cmake\Modules\Platform\Emscripten.cmake;-DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=BOTH
-- Configuring done (0.6s)
-- Generating done (0.0s)
-- Build files have been written to: C:/Users/firec/Files/vivescence/CMake/Build
cmake --build C:\Users\firec\Files\vivescence\CMake\Build
ninja: no work to do.
scons: done reading SConscript files.
scons: Building targets ...
em++ -o Source\Generated\BuildInfo.gen.o -c -s USE_PTHREADS=1 -fwasm-exceptions -sUSE_FREETYPE=1 -sUSE_HARFBUZZ=1 -fPIC -DVIVESCENCE_DEBUG -DMBEDTLS_USER_CONFIG_FILE=\"MbedTLSConfig.hpp\" -DHALF_ENABLE_CPP11_CFENV=0 -DHALF_ENABLE_CPP11_USER_LITERALS=0 -DAS_MAX_PORTABILITY -DAS_USE_STLNAMES=1 -DSDL_STATIC -IExtern\Include -IExtern\FireCatMagic\Source -IExtern\FireCatMagic\Extern\Include -IExtern\FireCatMagic\Extern\angelscript\sdk\angelscript\include -IExtern\FireCatMagic\Extern\angelscript\sdk\add_on -IExtern\FireCatMagic\Extern\zstd\lib -ISource -IAPI -ICMake\Install\include -ICMake\Install\include\everest -ICMake\Install\include\mbedtls -ICMake\Install\include\psa -ICMake\Install\include\SDL3 -ICMake\Install\include\SDL3_mixer Source\Generated\BuildInfo.gen.cpp
em++ -o Build\Vivescence.html "-s WASM=1" -s USE_PTHREADS=1 -s ALLOW_MEMORY_GROWTH=1 -s PTHREAD_POOL_SIZE=Math.min(Math.max(parseInt(navigator.hardwareConcurrency),4),32) -s ENVIRONMENT=web -s EXPORTED_FUNCTIONS=_main -s EXPORTED_RUNTIME_METHODS=requestFullscreen,ccall,cwrap -sMIN_WEBGL_VERSION=2 -sMAX_WEBGL_VERSION=2 -sGL_ASSERTIONS=1 -sFORCE_FILESYSTEM=1 -sFETCH=1 -sUSE_FREETYPE=1 -sUSE_HARFBUZZ=1 -sMAIN_MODULE=2 -fPIC -lidbfs.js --preload-file C:\Users\firec\Files\vivescence/Build/Data@Data -fwasm-exceptions -sSTACK_SIZE=262144 --shell-file C:\Users\firec\Files\vivescence\EmscriptenShell.html -gsource-map -sASSERTIONS=2 -lwebsocket.js Source\Main.o Source\VivescenceMain.o Source\API\BlockBehavior.o Source\API\Registry.o Source\API\Variant.o Source\API\World.o Source\APIDefinitions\AudioGroup.o Source\APIDefinitions\HTTPRequest.o Source\Audio\AudioManager.o Source\Client\ClientSettings.o Source\Core\EntitySerialization.o Source\Core\Utility.o Source\Core\Input\InputManager.o Source\Core\Input\InputEvent\InputEvent.o Source\Core\Input\InputEvent\InputEventKey.o Source\Core\Input\InputEvent\InputEventMouseButton.o Source\Core\Input\InputEvent\InputEventMouseMotion.o Source\Core\Input\InputEvent\InputEventMouseWheel.o Source\Core\Input\InputMap\InputMap.o Source\Core\Input\InputReceiver\InputReceiver.o Source\Core\ProgramState\ProgramState.o Source\Core\ProgramState\ProgramStateLoading.o Source\Core\ProgramState\ProgramStateServerEditMenu.o Source\Core\ProgramState\ProgramStateTest.o Source\Core\ProgramState\ProgramStateTitleMenu.o Source\Core\ProgramState\ProgramStateWomb.o Source\Core\ProgramState\ProgramStateWorld.o Source\Core\ProgramState\ProgramStateWorldCreationMenu.o Source\Core\ProgramState\ProgramStateWorldEditMenu.o Source\Core\ProgramState\ProgramStateWorldSelectMenu.o Source\Core\Window\WindowV2.o Source\Core\World\ChunkData.o Source\Core\World\ChunkV2.o Source\Core\World\GenerateChunkData.o Source\Core\World\LightPropagationManager.o Source\Core\World\StorageGUIContext.o Source\Core\World\World.o Source\Core\World\WorldClient.o Source\Core\World\WorldGUIManager.o Source\Core\World\WorldProperties.o Source\Core\World\WorldServer.o Source\Core\World\ChunkSaveFormat\ChunkSaveFormat.o Source\Core\World\ChunkSaveFormat\ChunkSaveFormatV1.o Source\Core\World\ChunkSaveFormat\ChunkSaveFormatV2.o Source\Core\World\ECS\ApplyEntityLightSystem.o Source\Core\World\ECS\BleedSysten.o Source\Core\World\ECS\CameraSystem.o Source\Core\World\ECS\ChunkStatusSystem.o Source\Core\World\ECS\DecaySystem.o Source\Core\World\ECS\EntityChunkPartitioningSystem.o Source\Core\World\ECS\EntityControllerSystem.o Source\Core\World\ECS\EntityModelRendererManagerSystem.o Source\Core\World\ECS\FollowSystem.o Source\Core\World\ECS\GravitySystem.o Source\Core\World\ECS\HUDSystem.o Source\Core\World\ECS\InputStateSystem.o Source\Core\World\ECS\InteractionSystem.o Source\Core\World\ECS\NaturalSpawningSystem.o Source\Core\World\ECS\PhysicsSystem.o Source\Core\World\ECS\RegenerationSystem.o Source\Core\World\ECS\RenderHoveredBlockSystem.o Source\Core\World\ECS\RotationSystem.o Source\Core\World\ECS\SpeedSystem.o Source\Core\World\WorldSystem\CameraSystem.o Source\Core\World\WorldSystem\ChunkManagementSystem.o Source\Core\World\WorldSystem\EntityModelRendererManagementSystem.o Source\Core\World\WorldSystem\HUDSystem.o Source\Core\World\WorldSystem\InputStateSystem.o Source\Core\World\WorldSystem\InteractionSystem.o Source\Core\World\WorldSystem\PhysicsSystem.o Source\Core\World\WorldSystem\RenderFocusedBlockSystem.o Source\Data\Block.o Source\Data\BlockModelConfiguration.o Source\Data\BlockModelConfigurationInformation.o Source\Data\DataPackManager.o Source\Data\EntityModel.o Source\Data\EntityTemplate.o Source\Data\Font.o Source\Data\Module.o Source\Data\TextureAtlasV2.o Source\Data\TextureV2.o Source\Data\Registry\AudioGroupRegistry.o Source\Data\Registry\AudioRegistry.o Source\Data\Registry\BlockBehaviorRegistry.o Source\Data\Registry\BlockModelRegistry.o Source\Data\Registry\BlockRegistry.o Source\Data\Registry\EntityComponentRegistry.o Source\Data\Registry\EntityComponentRegistryOLD.o Source\Data\Registry\EntityTemplateRegistry.o Source\Data\Registry\GenomeRegistry.o Source\Data\Registry\ItemBehaviorRegistry.o Source\Data\Registry\ItemPropertyRegistry.o Source\Data\Registry\ItemRegistry.o Source\Data\Registry\ModuleRegistry.o Source\Data\Registry\NativeEntitySystemRegistry.o Source\Data\Registry\RecipeRegistry.o Source\Data\Registry\ServerServiceRegistry.o Source\Data\Registry\TextureRegistry.o Source\Data\Registry\TraitRegistry.o Source\Data\Registry\WorldGenerationStepRegistry.o Source\Data\Registry\WorldGeneratorRegistry.o Source\Data\Registry\WorldSystemRegistry.o Source\Debug\Debug.o Source\Generated\BuildInfo.gen.o Source\Packet\Client\AuthenticatePacket.o Source\Packet\Client\SetAimNormalPacket.o Source\Packet\Client\SetLocalPlayerEntityComponentDataPacket.o Source\Packet\Client\SetMovementInputNormalPacket.o Source\Packet\Client\SetPressedActionFlagsPacket.o Source\Packet\Client\SetSelectedHotbarIndexPacket.o Source\Packet\Client\TrySendMessagePacket.o Source\Packet\Server\AddEntityComponentPacket.o Source\Packet\Server\BlockDestroyedPacket.o Source\Packet\Server\BlockPlacedPacket.o Source\Packet\Server\CreateEntityPacket.o Source\Packet\Server\DestroyEntityPacket.o Source\Packet\Server\LoadChunkPacket.o Source\Packet\Server\RemoveEntityComponentPacket.o Source\Packet\Server\SendMessagePacket.o Source\Packet\Server\SetChunkBufferIndexPacket.o Source\Packet\Server\SetChunkBufferRegionPacket.o Source\Packet\Server\SetEntityComponentDataPacket.o Source\Packet\Server\SetRemoteEntityPacket.o Source\Packet\Server\SetWorldPropertyPacket.o Source\Packet\Server\UnloadChunkPacket.o Source\Rendering\RenderingContext.o Source\Rendering\WorldRenderingManager.o Source\Rendering\Camera\Camera.o Source\Rendering\Camera\ControlledCamera.o Source\Rendering\Image\Image.o Source\Rendering\OpenGL\GLEBO.o Source\Rendering\OpenGL\GLUBOManager.o Source\Rendering\OpenGL\GLVAO.o Source\Rendering\OpenGL\GLVBO.o Source\Rendering\OpenGL\RenderingContextOpenGL.o Source\Rendering\Renderer\Renderer.o Source\Rendering\Renderer\BlockModelRenderer\BlockModelRenderer.o Source\Rendering\Renderer\BlockModelRenderer\BlockModelRenderer2D.o Source\Rendering\Renderer\BlockModelRenderer\BlockModelRenderer3D.o Source\Rendering\Renderer\BlockModelRenderer\BlockModelRendererBase.o Source\Rendering\Renderer\BoxOutlineRenderer\BoxOutlineRenderer.o Source\Rendering\Renderer\ChunkRenderer\ChunkRenderer.o Source\Rendering\Renderer\CloudsRenderer\CloudsRenderer.o Source\Rendering\Renderer\EntityModelRenderer\EntityModelRenderer.o Source\Rendering\Renderer\ItemModelRenderer\ItemModelRenderer2D.o Source\Rendering\Renderer\ItemModelRenderer\ItemModelRenderer3D.o Source\Rendering\Renderer\RectangleRenderer\NinePatchRenderer2D.o Source\Rendering\Renderer\RectangleRenderer\RectangleRenderer2D.o Source\Rendering\Renderer\SkyRenderer\SkyRenderer.o Source\Rendering\Renderer\TextRenderer\TextRenderer2D.o Source\Rendering\Shader\Shader.o Source\Rendering\Shader\ShaderProgram.o Source\Rendering\Texture\GLTexture.o Source\Service\Ezcha\ClientServiceEzcha.o Source\Service\Ezcha\EzchaBase.o Source\Service\Ezcha\ServerServiceEzcha.o Source\Service\Generic\ClientServiceGeneric.o Source\Service\Generic\ServerServiceGeneric.o Source\Tests\Tests.o Extern\FireCatMagic\Extern\mbedtls\library\base64.o Extern\FireCatMagic\Extern\mbedtls\library\md5.o Extern\FireCatMagic\Extern\mbedtls\library\platform_util.o Extern\glad\gl.o Extern\tinyobjloader\tiny_obj_loader.o Extern\stb_image_write.o Extern\stb_rect_pack.o Build\libGUI.a -LCMake\Install\lib Extern\FireCatMagic\libfirecatmagic.a -lSDL3 -lSDL3_mixer -lopusfile -lopus -logg

I'm not sure what I am supposed to do at this point. I can't use MAIN_MODULE=1 because it just freezes the tab and I can't play my game. Can't use MAIN_MODULE=2 because it can't load the side modules because of missing symbols.