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

Beginner friendly Everything

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2,037 open issues indexed

Add diagnose_if warnings for slow SIMD stuff? Open

good first bug help wanted

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

emscripten-core/emscripten#12871 · 3 comments · 1 reaction · Opened Nov 24, 2020
C stdlib function fread breaks with bytes with leading 1s Open

wontfix

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

emscripten-core/emscripten#12867 · 4 comments · Opened Nov 23, 2020
What is the reason not having The WebAssembly Binary Toolkits in Emscripten 2.0.8 Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12866 · 3 comments · Opened Nov 23, 2020
Module.instantiateWasm callback failed with error: ReferenceError: resetPrototype is not defined, when using pthreads+MODULARIZE+sanitizers Open

help wanted wontfix

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

emscripten-core/emscripten#12865 · 4 comments · 1 reaction · Opened Nov 23, 2020
compile successfully, and running normal on browser, but the result is wrong. Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 25/100

emscripten-core/emscripten#12849 · 5 comments · Opened Nov 21, 2020
Remove `_` prefix/name mangling for native symbols Open

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

emscripten-core/emscripten#12844 · 4 comments · Opened Nov 20, 2020
Atleast the latest Emscripten build breaks CMake / emcmake compilation Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12828 · 3 comments · Opened Nov 19, 2020
more than one touch asserts emscripten_set_touchmove_callback callback Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12826 · 4 comments · 1 reaction · Opened Nov 19, 2020
please update docs/packaging.md to cover Debian packaging Open

wontfix

Difficulty 1/5 Under an hour Newbie friendliness 45/100

emscripten-core/emscripten#12812 · 2 comments · Opened Nov 18, 2020
Add a custom logging facility along with console.error in threadPrintErr function. Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 30/100

emscripten-core/emscripten#12811 · 1 comment · Opened Nov 18, 2020
Avoid emitting library calls in standalone WASM Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 30/100

emscripten-core/emscripten#12809 · 19 comments · Opened Nov 18, 2020
firefox hangs when using fetch api Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12805 · 2 comments · Opened Nov 17, 2020
obsolete find syntax in tests/third_party/freealut/Makefile.* Open

wontfix

Difficulty 1/5 Under an hour Newbie friendliness 35/100

emscripten-core/emscripten#12802 · 3 comments · Opened Nov 17, 2020
Better error messages when loading the wrong Wasm binary? Open

wontfix

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

emscripten-core/emscripten#12796 · 5 comments · Opened Nov 17, 2020
Create Wasm globals from C code? Open

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

emscripten-core/emscripten#12793 · 15 comments · 2 reactions · Opened Nov 17, 2020
undefined symbols for fetch api even with FETCH = 1 Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12791 · 3 comments · Opened Nov 16, 2020
Duplicate main and __original_main Open

wontfix

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

emscripten-core/emscripten#12787 · 4 comments · Opened Nov 15, 2020
Emscripten Atomics API misdepends on malloc and free Open

wontfix

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

emscripten-core/emscripten#12786 · 4 comments · Opened Nov 15, 2020
Improved heap growth check in pthreads with memory growth enabled? Open

wontfix

Difficulty 5/5 Over a week Newbie friendliness 20/100

emscripten-core/emscripten#12783 · 4 comments · Opened Nov 15, 2020
Wasm table is not optimized away if not used Open

wontfix

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

emscripten-core/emscripten#12779 · 2 comments · Opened Nov 14, 2020
__wasm_call_ctors is also emitted into C programs, and not optimized out in C++ programs if there are no ctors to call. Open

wontfix

emscripten-core/emscripten#12777 · 2 comments · 1 assignee · Opened Nov 14, 2020
C function free not working. Memory leak of malloc and free. Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12776 · 7 comments · Opened Nov 14, 2020
fetch apis not working from web worker thread in async mode Open

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

emscripten-core/emscripten#12772 · 14 comments · Opened Nov 13, 2020
Inconsistent output of first invocation of `em++ -dumpmachine` is breaking tools Open

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

emscripten-core/emscripten#12769 · 3 comments · Opened Nov 13, 2020
BindingError when running unittests twice Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 30/100

emscripten-core/emscripten#12768 · 3 comments · Opened Nov 13, 2020
Missing emcc --help documentation on emcc flags that affect wasm codegen? Open

wontfix

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

emscripten-core/emscripten#12760 · 4 comments · Opened Nov 11, 2020
Emscripten Install broken by doing a pthreads build. Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 30/100

emscripten-core/emscripten#12753 · 5 comments · Opened Nov 10, 2020
NODE_CODE_CACHING with dynamic libraries Open

help wanted wontfix

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

emscripten-core/emscripten#12752 · 7 comments · Opened Nov 10, 2020
Problem with EM_FUNC_SIG_PARAM_I64 when posting to main thread Open

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

emscripten-core/emscripten#12748 · 3 comments · Opened Nov 9, 2020
websocket protocols Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

emscripten-core/emscripten#12745 · 6 comments · 2 reactions · Opened Nov 9, 2020
C compiled WASM functions - Pointers logic do not work as expected Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12742 · 8 comments · Opened Nov 9, 2020
Memory leak during repeated runs on node.js? Open

good first bug help wanted

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

emscripten-core/emscripten#12740 · 15 comments · 1 reaction · Opened Nov 9, 2020
Flake errors Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 35/100

emscripten-core/emscripten#12727 · 2 comments · Opened Nov 8, 2020
Document long double printing issues (was: std::numeric_limits<long double>::max() returns infinity) Open

good first bug help wanted wontfix

Difficulty 4/5 3-5 days Newbie friendliness 30/100

emscripten-core/emscripten#12720 · 27 comments · Opened Nov 6, 2020
Emscripten does not process input method editor event，so app can not receive ime data to process input words Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12718 · 1 comment · Opened Nov 6, 2020
Imply -msimd128 when -msse* or other similar flags are specified Open

SIMD wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

emscripten-core/emscripten#12714 · 19 comments · 3 reactions · Opened Nov 5, 2020
Swap executable bit between .js and .wasm files? Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 35/100

emscripten-core/emscripten#12707 · 2 comments · Opened Nov 5, 2020
file-packager js output not working with closure and --pre-js Open

good first bug help wanted

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

emscripten-core/emscripten#12701 · 3 comments · Opened Nov 4, 2020
A programmatic way to kill running WASM instance on Browser? Open

wontfix

Difficulty 5/5 Over a week Newbie friendliness 15/100

emscripten-core/emscripten#12696 · 1 comment · Opened Nov 4, 2020
Add testing for our windows-specific emcmake behaviour. Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 35/100

emscripten-core/emscripten#12691 · 1 comment · Opened Nov 3, 2020
wasm2c.js sources/build-routines are missing Open

wontfix

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

emscripten-core/emscripten#12688 · 5 comments · Opened Nov 3, 2020
emscripten fetch api should be more like JS Fetch API Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

emscripten-core/emscripten#12684 · 8 comments · 4 reactions · Opened Nov 2, 2020
system/lib/libc/musl/COPYRIGHT references non-existent file src/string/arm/memcpy_el.S Open

good first bug help wanted pinned

Difficulty 1/5 Under an hour Newbie friendliness 68/100

emscripten-core/emscripten#12680 · 3 comments · Opened Nov 2, 2020
WebIDL static on prototype vs. function/class definition is not correct Open

wontfix

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

emscripten-core/emscripten#12676 · 4 comments · Opened Nov 2, 2020
[Emscripten 2.0.8] Assertion failed: (ESI.Type != EST_Uninstantiated), function SubstExceptionSpec Open

wontfix

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

emscripten-core/emscripten#12639 · 8 comments · 2 reactions · Opened Oct 29, 2020
Increase visibility of --extern-post-js for avoiding onRuntimeInitialized misfires; consider Promisifying onRuntimeInitialized Open

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

emscripten-core/emscripten#12637 · 11 comments · Opened Oct 29, 2020
Switch to disable configuration through environment variables Open

wontfix

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

emscripten-core/emscripten#12611 · 11 comments · Opened Oct 27, 2020
libunwind CREDITS.TXT is missing - and arguably required to comply with its license Open

good first bug help wanted pinned

Difficulty 3/5 1-2 days Newbie friendliness 38/100

emscripten-core/emscripten#12605 · 3 comments · Opened Oct 26, 2020
Undefined Reference while using webgl Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 25/100

emscripten-core/emscripten#12596 · 2 comments · Opened Oct 24, 2020
Want invoke remote FLASK (rest) server from my C++ client Open

wontfix

Difficulty 5/5 Over a week Newbie friendliness 20/100

emscripten-core/emscripten#12577 · 2 comments · Opened Oct 22, 2020

emscripten-core/emscripten

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