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Imported Upstream version 5.20.0.180

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Xamarin Public Jenkins (auto-signing)
2019-02-04 20:11:37 +00:00
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external/corert/Documentation/how-to-build-WebAssembly.md vendored
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@@ -4,6 +4,7 @@
1. Install Emscripten by following the instructions [here](https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html).
2. Follow the instructions [here](https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html#updating-the-sdk) to update Emscripten to the latest version.
3. Install [Firefox](https://www.getfirefox.com) (for testing).
3. Get CoreRT set up by following the [Visual Studio instructions](how-to-build-and-run-ilcompiler-in-visual-studio.md).
4. Build the WebAssembly runtime by running ```build.cmd wasm``` from the repo root.
5. Run the WebAssembly "Hello World" test by running ```C:\corert\tests\runtest.cmd wasm```.
@@ -36,6 +37,7 @@ This is Windows only for now.
# Useful tips #
* To manually make ILC compile to WebAssembly, add ```--wasm``` to the command line.
* To debug C# source, add ```-g4``` to the emcc command line and change ```-s WASM=1``` to ```-s WASM=0```. This will generate a JavaScript source map that browser debuggers and Visual Studio Code can work with. Using Visual Studio Code's Chrome debugger works particularly well.
* Add ```-g3``` to the emcc command line to generate more debuggable output and a .wast file with the text form of the WebAssembly.
* Omit ```-s WASM=1``` from the emcc command line to generate asm.js. Browser debuggers currently work better with asm.js and it's often a bit more readable than wast.
* Change ```-s WASM=1``` to ```-s WASM=0``` in the emcc command line to generate asm.js. Browser debuggers currently work better with asm.js and it's often a bit more readable than wast.
* Add ```-O2 --llvm-lto 2``` to the emcc command line to enable optimizations. This makes the generated WebAssembly as much as 75% smaller as well as more efficient.