webassembly

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Requirements

To compile C/C++
- emcc hw.c -s WASM=1 -s SIDE_MODULE=1 -o hw.wasm
- emcc hw.cpp -s WASM=1 -o hw.html
- em++ hw.cpp -s WASM=1 --bind --std=c++11 -o hw.js
To update emsdk source run emsdk update or git pull&&emsdk update-tags (for the github repo clone)
To update emsdk used run emsdk install sdk-1.38.24-64bit change version to the latest (see emsdk list), this action will install 3 components: emscripten-1.38.24, clang-e1.38.24-64bit, node-8.9.1-64bit
To activate emsdk run emsdk activate sdk-1.38.24-64bit

all options here settings

-Os optimizations (O0, O1, O2, O3, Os, Oz)
-g generate wast, wasm, wasm.map
-s WASM=1 with JS polyfill
-s "BINARYEN_METHOD='native-wasm'" without polyfill (default)
- methods: ['native-wasm', 'interpret-s-expr', 'interpret-binary', 'interpret-asm2wasm', 'asmjs']
-o <target> one of <name> + '.js' || '.html' || '.bc'(default) || '.o'
-s MAIN_MODULE=1 system libraries linked in or -s SIDE_MODULE=1 without
-s BINARYEN_ASYNC_COMPILATION=1
-s ONLY_MY_CODE=1 only compiles your methods, and stops Emscripten including parts of its standard library
-s EXPORTED_FUNCTIONS="['_my_func','_my_2d_func']" lists the methods we'd like to access from JavaScript. Note that these names are from the source, with a prefixed underscore.