emscripten_wasm_eh - The Rust Unstable Book

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# `emscripten-wasm-eh`

Use the WebAssembly exception handling ABI to unwind for the `wasm32-unknown-emscripten`. If compiling with this setting, the `emcc` linker should be invoked with `-fwasm-exceptions`. If linking with C/C++ files, the C/C++ files should also be compiled with `-fwasm-exceptions`.