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Add What's New entry about Emscripten changes

awaiting merge

docsDocumentation in the Doc dirDocumentation in the Doc dir

needs backport to 3.14bugs and security fixesbugs and security fixes

OS-emscripten

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Status: Open (in progress).

python/cpythonnumber 137035

#137035 In python/cpython;

· hoodmane opened on Jul 23, 2025

Emscripten build fails with Python 3.14

3.14bugs and security fixesbugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

OS-emscripten

Status: Open.

#137025 In python/cpython;

· treyhunner opened on Jul 22, 2025

Emscripten build doesn't include <code>_decimal</code>, <code>_uuid</code>, <code>_ssl</code> or <code>_hashlib</code>

extension-modulesC modules in the Modules dirC modules in the Modules dir

OS-emscripten

Status: Open.

#136976 In python/cpython;

· hoodmane opened on Jul 22, 2025

Don't use <code>var</code> in js code

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

OS-emscripten

type-refactorCode refactoring (with no changes in behavior)Code refactoring (with no changes in behavior)

Status: Open.

#136938 In python/cpython;

· sobolevn opened on Jul 21, 2025

Allow Subinterpreters on WASI/Emscripten Builds

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

OS-emscripten

OS-wasi

stdlibPython modules in the Lib dirPython modules in the Lib dir

testsTests in the Lib/test dirTests in the Lib/test dir

topic-subinterpreters

Status: Open.

#135190 In python/cpython;

· ericsnowcurrently opened on Jun 5, 2025

emscripten cross-compile wasm-ld: error: duplicate symbol <code>_Py_LibHacl_Hacl_Hash_*</code>

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

buildThe build process and cross-buildThe build process and cross-build

extension-modulesC modules in the Modules dirC modules in the Modules dir

OS-emscripten

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#133042 In python/cpython;

· Lukasdoe opened on Apr 27, 2025

Wasi + Emscripten: configure behavior with --enable-optimizations seems incorrect?

buildThe build process and cross-buildThe build process and cross-build

OS-emscripten

OS-wasi

Status: Open.

#126748 In python/cpython;

· hoodmane opened on Nov 12, 2024

Emscripten settings in configure.ac are not embedding friendly

OS-emscripten

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#120746 In python/cpython;

· allsey87 opened on Jun 19, 2024

WASM build step does something weird with prefix

3.11only security fixesonly security fixes

3.12only security fixesonly security fixes

buildThe build process and cross-buildThe build process and cross-build

OS-emscripten

Status: Open.

#92744 In python/cpython;

· zooba opened on May 12, 2022