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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