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What's Changed

  • The ability to redirect JS compiler stderr using EMCC_STDERR_FILE was
    removed. These days you can use EMCC_DEBUG and/or EMCC_DEBUG_SAVE to
    preserve all the intermediate JS compiler files. (#27101)
  • The installed versions of the compiler-rt library now follow the upstream
    naming convetion of libclang_rt.<something>.a. (#27089)
  • Dynamic linking now explicitly requires asynchronous Wasm compilation. The
    process of loading side modules at startup currently depends on this. (#27086)
  • New experimental -sCROSS_ORIGIN_STORAGE linker flag integrating the
    proposed Cross-Origin Storage browser API
    as a progressive enhancement for Wasm loading on the web target. See
    docs/compiling/CrossOriginStorage.rst for details. (#27066)
  • The -sUSE_PTHREADS and -sMEMORY64 flags have been deprecated in favor of the
    more standard -pthread and -m64 (or --target=wasm64) flags. (#27025)
  • Adds wasm-bindgen support. When -sWASM_BINDGEN is set, Emscripten will call
    out to wasm-bindgen in the users's path and integrate the wasm-bindgen JS
    with the normal Emscripten JS. Some wasm-bindgen features may not yet be fully
    supported. (#23493)
  • Fixed getentropy/random_get spuriously failing under Node.js and the
    shell environment for small requests. (#27122)
  • The startup process for the generated program now makes use of async /
    await under more circumstances (specifically when using setStatus, or
    run dependencies). This means that errors during startup (or during the
    main() function) will more often show up as unhandled promise rejections
    (onunhandledreject) rather than synchronous errors (onerror). (#27121)

Contributors

Thanks to the following contributors: @sbc100 (48) @brendandahl (3) @hwhsu1231 (3) @kleisauke (3) @Diyou (2) @arsnyder16 (1) @guybedford (1) @hoodmane (1) @iakovgi (1) @juj (1) @stevenwdv (1) @tomayac (1) @valadaptive (1) @walkingeyerobot (1)

New Contributors

Full Changelog: https://github.com/emscripten-core/emscripten/compare/6.0.0...6.0.1

Source: README.md, updated 2026-06-18