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What's Changed

  • The SDL3 port is no longer considered experimental, and the compiler diagnostic warning has been removed. (#27646)
  • WASM=0 and WASM=2 (wasm2js) were marked as deprecated. (See [#27608])
  • mimalloc was updated to 3.5.1. (#27662)
  • -sWASM_BINDGEN supports emcc usage as a post-link step, where EXPORTED_FUNCTIONS is authoritative. wasm-bindgen processing is only performed when the linker inputs carry the wasm-bindgen Emscripten marker section, so -sWASM_BINDGEN can safely be passed to non-wasm-bindgen builds. (#27208)
  • Embind value_object and value_array argument temporaries for trivially constructible/destructible types (up to alignof 16) are now placed on the wasm stack instead of being heap-allocated per call, and per-field destructor bookkeeping is skipped when the type registers no destructor. This removes the per-call garbage on such calls. The registration ABI gained size and triviality parameters, so object files built against an older bind.h need to be rebuilt. (#27610)
  • emscripten_clear_timeout now releases the runtime keepalive held by the pending timeout, and both emscripten_clear_timeout and emscripten_clear_immediate are no-ops for ids that already fired. (#27720)
  • The NODE_CODE_CACHING setting was removed, as node's support for serializing WebAssembly modules has been missing for over 5 years now.

Contributors

Thanks to the following contributors: @sbc100 (46) @guybedford (9) @aheejin (4) @dschuff (4) @dimokol (2) @kleisauke (2) @brendandahl (1) @jeremy-code (1) @jrcain-usgs (1) @Kammu2000 (1) @kripken (1) @mrnickzh (1) @tlively (1)

New Contributors

Full Changelog: https://github.com/emscripten-core/emscripten/compare/6.0.9...6.0.10

Source: README.md, updated 2026-09-18