6.0.10
asheshgoplani/agent-deck6.0.10Sep 21, 2026by emscripten-bot
Upgrading?
AI Summary
Emscripten 6.0.10 stabilizes the SDL3 port, deprecates WASM=0 and WASM=2, updates mimalloc, and improves wasm-bindgen, Embind, and timeout handling. It also removes the obsolete NODE_CODE_CACHING setting and includes an Embind registration ABI change requiring rebuilds.
Key Highlights
- SDL3 port is no longer experimental and its compiler diagnostic warning is removed.
- WASM=0 and WASM=2 (wasm2js) are marked deprecated.
- mimalloc updated to 3.5.1.
- -sWASM_BINDGEN now supports emcc usage as a post-link step and is safe for non-wasm-bindgen builds.
- Embind value_object and value_array temporaries for trivial types are placed on the wasm stack instead of heap-allocated per call.
Breaking Changes
- Embind registration ABI gained size and triviality parameters, so object files built against an older bind.h must be rebuilt.
- The NODE_CODE_CACHING setting was removed.
- WASM=0 and WASM=2 are deprecated.
New Features
- -sWASM_BINDGEN support for emcc post-link usage.
- Embind stack allocation optimization for trivially constructible/destructible value_object and value_array arguments.
- emscripten_clear_timeout releases the runtime keepalive held by pending timeouts.
- emscripten_clear_timeout and emscripten_clear_immediate are no-ops for IDs that already fired.
Full Release Notes
## 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 * @mrnickzh made their first contribution in https://github.com/emscripten-core/emscripten/pull/26886 * @Kammu2000 made their first contribution in https://github.com/emscripten-core/emscripten/pull/27671 * @jrcain-usgs made their first contribution in https://github.com/emscripten-core/emscripten/pull/27691 * @dimokol made their first contribution in https://github.com/emscripten-core/emscripten/pull/27610 **Full Changelog**: https://github.com/emscripten-core/emscripten/compare/6.0.9...6.0.10
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