emscripten-core/emscripten

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Emscripten: An LLVM-to-WebAssembly Compiler

Stars: 27.6k
Forks: 3.6k
Open beginner issues: 0
Indexed issues: 2k
Avg merge: 1d 14h
Merged PRs (30d): 125

Dominant language: C++
License: No license data
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

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2,037 open issues indexed

C++ exception in promise is freed prematurely, and destructor does not run Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

emscripten-core/emscripten#27705 · 2 comments · Opened Sep 14, 2026
WasmFS: rename deadlocks against concurrent path lookups in the same directory tree (child-before-parent lock order in __syscall_renameat) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

emscripten-core/emscripten#27684 · Opened Sep 8, 2026
Pipe read() never blocks, and poll() ignores timeouts Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#27683 · 1 comment · Opened Sep 7, 2026
Decouple test suite from compiler internals for pure blackbox testing Open

tests

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#27666 · 1 comment · Opened Sep 4, 2026
Tracking issue - WASM_BINDGEN snippets support changes Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27665 · Opened Sep 4, 2026
BUILD_AS_WORKER: onmessage is installed too late under MODULARIZE, and is installed even on the main thread Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

emscripten-core/emscripten#27625 · 2 comments · Opened Aug 30, 2026
Feature Request: Mount OPFS subdirectories Open

wasmfs

Difficulty 4/5 3-5 days Newbie friendliness 55/100

emscripten-core/emscripten#27621 · Opened Aug 29, 2026
OPFS breaks with -pthread -sPROXY_TO_PTHREAD -sJSPI Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

emscripten-core/emscripten#27620 · 1 comment · Opened Aug 29, 2026
Dynamic linking breaks with exportet non-JavaScript Identifiers Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

emscripten-core/emscripten#27611 · 1 comment · Opened Aug 26, 2026
Tracking issue for the deprecation and removal of wasm2js (AKA `WASM=0`) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

emscripten-core/emscripten#27608 · Opened Aug 25, 2026
-sSINGLE_FILE: embedded wasm string decodes to 1 extra byte (0x20), producing invalid wasm (large binaries) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

emscripten-core/emscripten#27600 · 3 comments · Opened Aug 23, 2026
I can't use the standard library in my dynamic side module no matter what I do, MAIN_MODULE=1 freezes the game. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#27588 · 7 comments · Opened Aug 21, 2026
[feature request] Allow more granular `-sERROR_ON_UNDEFINED_SYMBOLS=getpass` Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

emscripten-core/emscripten#27583 · 15 comments · Opened Aug 21, 2026
Updating from bun 1.3 to 1.4 seems to have broken `core0.test_em_js_pthreads_dylink` Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

emscripten-core/emscripten#27580 · Opened Aug 20, 2026
Can we completely remove WASM_BIGINT=0 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#27565 · 3 comments · Opened Aug 18, 2026
embind: value_object/value_array arguments allocate on every call, and there is no fill-in-place read path Open

emscripten-core/emscripten#27553 · 2 comments · 1 assignee · Opened Aug 17, 2026
test_wasm_worker_futex_wait_pthreads is flakey Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

emscripten-core/emscripten#27551 · Opened Aug 16, 2026
parse exception: popping from empty stack Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

emscripten-core/emscripten#27525 · Opened Aug 11, 2026
Project fails to configure in cmake since i updated emsdk to 6.0.6 Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

emscripten-core/emscripten#27520 · 6 comments · Opened Aug 11, 2026
Permanent integration of Emscripten with autotools Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27518 · Opened Aug 11, 2026
Use `git subtree` to manage LLVM libraries and musl Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

emscripten-core/emscripten#27515 · Opened Aug 11, 2026
emrun quits immediately Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

emscripten-core/emscripten#27504 · 5 comments · Opened Aug 8, 2026
Should we make out CI tests immune network failures? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

emscripten-core/emscripten#27500 · 1 comment · Opened Aug 8, 2026
Can we find a way to convert `instantiateWasm` from callback to promises? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27499 · Opened Aug 8, 2026
Help interpreting an Emscripten 4.0.9 Wasm imported-call control-flow contradiction Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27486 · 2 comments · Opened Aug 4, 2026
Can `EmbindString` support `SharedArrayBuffer`? Open

emscripten-core/emscripten#27429 · 1 comment · 1 assignee · Opened Jul 28, 2026
Support for multivalue ABI? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#27418 · 3 comments · Opened Jul 26, 2026
Trouble with emcc 6.0.0 from #25930 Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

emscripten-core/emscripten#27403 · 8 comments · Opened Jul 22, 2026
JSPI shadow stack management Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27364 · Opened Jul 16, 2026
[regression from 6.0.2] LLVM crash when building OpenCV's color_lab.cpp Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27358 · 5 comments · Opened Jul 15, 2026
[regression from 6.0.2] LLVM crash when compiling OpenCV with Relaxed SIMD support Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

emscripten-core/emscripten#27356 · 1 comment · Opened Jul 15, 2026
Runtime crash when calling poll() from a worker thread with pthreads and Asyncify Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

emscripten-core/emscripten#27291 · 1 comment · Opened Jul 9, 2026
LLVM coverage runtime included when linking with `-sMAIN_MODULE=1` Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

emscripten-core/emscripten#27270 · 4 comments · Opened Jul 7, 2026
Link error when using `getrandom` Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

emscripten-core/emscripten#27257 · 3 comments · Opened Jul 6, 2026
Update compiler-rt with clang? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#27223 · 7 comments · Opened Jun 30, 2026
OpenMP does not work on WASM64 Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

emscripten-core/emscripten#27221 · 5 comments · Opened Jun 30, 2026
Could emscripten report the usage of unsupported features in object files? Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

emscripten-core/emscripten#27213 · Opened Jun 29, 2026
run_python, run_python_compiler could readlink -f Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

emscripten-core/emscripten#27211 · 1 comment · Opened Jun 29, 2026
Remove dead code from generated JS file Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#27189 · Opened Jun 25, 2026
Should we have a setting that is the opposite of `LEGACY_VM_SUPPORT` Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

emscripten-core/emscripten#27177 · 12 comments · Opened Jun 24, 2026
Intensive `fseek`/`fread` calls are slow if main thread proxied to pthread, regardless of the file system used Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

emscripten-core/emscripten#27143 · Opened Jun 18, 2026
WASMFS (with OPFS backend) is extremely slow when reading simultaneously from multiple threads Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

emscripten-core/emscripten#27134 · 6 comments · Opened Jun 17, 2026
emscripten_fetch_unpack_response_headers returns header values with leading and trailing whitespace Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

emscripten-core/emscripten#27114 · 4 comments · Opened Jun 12, 2026
emsdk 6.0.0 and dynamic linking... Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

emscripten-core/emscripten#27104 · 1 comment · Opened Jun 11, 2026
Undefined wasmBinaryFile when compiled with SPLIT_MODULE and pthread Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

emscripten-core/emscripten#27064 · 4 comments · Opened Jun 7, 2026
cwrap with returnType "boolean" returns a number when all args are numeric Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

emscripten-core/emscripten#27021 · 2 comments · Opened May 28, 2026
Attach event listeners to the canvas rather than the window object Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

emscripten-core/emscripten#26971 · Opened May 16, 2026
Using single-line arrow functions can cause closure compiler to inject an extra `return` keyword`. Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

emscripten-core/emscripten#26922 · Opened May 12, 2026
Implement mutexes in non-pthreads Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

emscripten-core/emscripten#26914 · 1 comment · Opened May 10, 2026
Cryptographic check-summing not available for WebAssembly.instantiateStreaming() Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

emscripten-core/emscripten#26911 · 1 comment · Opened May 10, 2026

emscripten-core/emscripten

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