Actually emscripten should be getting incremental linking soon. It depends on upstream components, the LLVM wasm backend and lld. Those are almost ready now. I

Actually emscripten should be getting incremental linking soon. It depends on upstream components, the LLVM wasm backend and lld. Those are almost ready now. In other words, the emscripten integration for those components is the easy work, the upstream LLVM/lld stuff is the hard part.