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

Feature Request: Control hardware concurrency reported to C/C++ Open

wontfix

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

emscripten-core/emscripten#13372 · 7 comments · Opened Jan 29, 2021
Cannot find module 'acorn' compilation error Open

wontfix

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

emscripten-core/emscripten#13368 · 4 comments · Opened Jan 28, 2021
Wasm2JS double heap assignments get split into two i32 assignments. Open

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

emscripten-core/emscripten#13365 · 2 comments · Opened Jan 28, 2021
Wasm2JS redundant asm.jsism Open

wontfix

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

emscripten-core/emscripten#13364 · 1 comment · Opened Jan 28, 2021
Wasm2JS missed optimization opportunity on memset like repeated heap assignments Open

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

emscripten-core/emscripten#13363 · 2 comments · Opened Jan 28, 2021
Wasm2JS redundant x + 0 operations Open

wontfix

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

emscripten-core/emscripten#13362 · 3 comments · Opened Jan 28, 2021
`uname` should return something more meaningful Open

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

emscripten-core/emscripten#13356 · 11 comments · Opened Jan 28, 2021
HTML5 Callbacks and C++ Open

wontfix

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

emscripten-core/emscripten#13343 · 1 comment · Opened Jan 27, 2021
Clarify and document naming convention used in our client side JS (library and support code). Open

wontfix

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

emscripten-core/emscripten#13341 · 2 comments · 1 reaction · Opened Jan 27, 2021
References to C++ built-in datatypes with Embind? Open

wontfix

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

emscripten-core/emscripten#13338 · 3 comments · Opened Jan 27, 2021
fetch.js doesn't work well in >2GB environment Open

help wanted wontfix

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

emscripten-core/emscripten#13323 · 1 comment · Opened Jan 26, 2021
Event handlers never consume events in Asyncify Open

asyncify Important

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

emscripten-core/emscripten#13320 · 3 comments · Opened Jan 26, 2021
"No thread API" error on C++ compile (macOS) Open

wontfix

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

emscripten-core/emscripten#13318 · 2 comments · Opened Jan 26, 2021
Building wasm with MAIN_MODULE gives runtime error after upgrade to 2.0.12 version Open

wontfix

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

emscripten-core/emscripten#13314 · 1 comment · Opened Jan 25, 2021
Need clarification in page:Optimizing Code Open

good first bug help wanted wontfix

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

emscripten-core/emscripten#13313 · 6 comments · Opened Jan 25, 2021
How to :-s STANDALONE_WASM and provide my own mmap/munamp Open

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

emscripten-core/emscripten#13312 · 3 comments · 1 reaction · Opened Jan 24, 2021
find_package not works in emcmake Open

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

emscripten-core/emscripten#13310 · 12 comments · 4 reactions · Opened Jan 24, 2021
Bad return value from WASM function with Asyncify and fibers Open

asyncify

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

emscripten-core/emscripten#13302 · 2 comments · Opened Jan 22, 2021
Synchronous dispatch to thread Open

wontfix

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

emscripten-core/emscripten#13287 · 4 comments · Opened Jan 20, 2021
problem with build cairo using emscripten(works fine if I just use cmake) Open

wontfix

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

emscripten-core/emscripten#13284 · 4 comments · Opened Jan 19, 2021
test_pthread_cond_signal_1_1 is flaky Open

flaky test

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

emscripten-core/emscripten#13283 · Opened Jan 19, 2021
Windows 64 installation Open

wontfix

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

emscripten-core/emscripten#13281 · 3 comments · Opened Jan 18, 2021
posixtestsuite hangs whole Windows OS when run on system with large number of cores Open

wontfix

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

emscripten-core/emscripten#13267 · 4 comments · Opened Jan 16, 2021
[DWARF] Strange line information at O1 Open

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

emscripten-core/emscripten#13256 · 5 comments · Opened Jan 14, 2021
enum values within namespaces can overwrite each other when using WebIDL Open

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

emscripten-core/emscripten#13243 · 5 comments · 1 reaction · Opened Jan 12, 2021
Function signature mismatch with Embind + Function Pointers + dynamic libraries + Optimizations (with minimal test case) Open

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

emscripten-core/emscripten#13241 · 18 comments · Opened Jan 12, 2021
Advice on semi-blocking implementation of `system` / `popen` / `posix_spawn` / `fork` / `vfork` / `exec` calls Open

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

emscripten-core/emscripten#13239 · 4 comments · 1 reaction · Opened Jan 12, 2021
[feature request] pwd.h functions (and getpwuid specifically) Open

good first bug help wanted wontfix

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

emscripten-core/emscripten#13219 · 3 comments · 4 reactions · Opened Jan 9, 2021
pipe() doesn't create a blocking pipe Open

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

emscripten-core/emscripten#13214 · 14 comments · 1 reaction · Opened Jan 8, 2021
Module.print behavior wrt zero bytes Open

wontfix

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

emscripten-core/emscripten#13204 · 1 comment · Opened Jan 8, 2021
syntax error in emscripten.py Open

wontfix

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

emscripten-core/emscripten#13200 · 9 comments · Opened Jan 6, 2021
Interaction between runtime exit, threads, and fetch Open

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

emscripten-core/emscripten#13193 · 7 comments · Opened Jan 6, 2021
Missing DWARF entries for passed-by-reference structs Open

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

emscripten-core/emscripten#13192 · 16 comments · Opened Jan 5, 2021
compile wasm binary without javascript imports.env (for deno support) Open

JavaScript

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

emscripten-core/emscripten#13190 · 11 comments · Opened Jan 5, 2021
-s MAXIMUM_MEMORY=4GB broke on node@10.23.0 Open

wontfix

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

emscripten-core/emscripten#13187 · 1 comment · Opened Jan 5, 2021
Sanitizers with dynamic linking Open

help wanted wontfix

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

emscripten-core/emscripten#13184 · 1 comment · Opened Jan 4, 2021
Getting different results on multiple run Open

wontfix

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

emscripten-core/emscripten#13181 · 1 comment · Opened Jan 3, 2021
Add option to disable warnings when ASYNCIFY_REMOVE functions are not found Open

asyncify help wanted

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

emscripten-core/emscripten#13179 · 2 comments · Opened Jan 3, 2021
SDL 2 and SDL image 2 dependencies Open

wontfix

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

emscripten-core/emscripten#13174 · 3 comments · Opened Jan 3, 2021
longjmp in Lua producing unexpected behavior in Emscripten 2.0.11 Open

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

emscripten-core/emscripten#13166 · 6 comments · Opened Jan 2, 2021
In threadprofiler.js, need type checking in updateUi function Open

wontfix

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

emscripten-core/emscripten#13157 · 6 comments · Opened Dec 31, 2020
Tutorial Request: Creating a canvas component in React/Other Open

wontfix

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

emscripten-core/emscripten#13151 · 8 comments · Opened Dec 31, 2020
[feature request] abspath / normpath for PATH Open

help wanted wontfix

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

emscripten-core/emscripten#13145 · 6 comments · Opened Dec 30, 2020
Uncaught (in promise) RuntimeError: abort(LinkError: WebAssembly.instantiate(): mismatch in shared state of memory, declared = 1, imported = 0). Build with -s ASSERTIONS=1 for more info. Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 20/100

emscripten-core/emscripten#13143 · 4 comments · Opened Dec 30, 2020
Uncaught (in promise) RuntimeError: abort(LinkError: WebAssembly.instantiate(): mismatch in shared state of memory, declared = 1, imported = 0). Build with -s ASSERTIONS=1 for more info. Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 15/100

emscripten-core/emscripten#13142 · 1 comment · Opened Dec 30, 2020
"SyntaxError: Unexpected token < in JSON at position 0" on source map load failure Open

help wanted

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

emscripten-core/emscripten#13136 · 4 comments · Opened Dec 29, 2020
animation / glSwapBuffers Open

wontfix

Difficulty 4/5 3-5 days Newbie friendliness 18/100

emscripten-core/emscripten#13134 · 2 comments · Opened Dec 29, 2020
Error: sinf and cosf return wrong values in iOS Safari 12 / iOS Chrome 12 Open

wontfix

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

emscripten-core/emscripten#13130 · 4 comments · Opened Dec 29, 2020
animation / glSwapBuffers Open

wontfix

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

emscripten-core/emscripten#13127 · 3 comments · Opened Dec 29, 2020
compiling tests/hello_world_gles_deriv.c Open

wontfix

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

emscripten-core/emscripten#13125 · 4 comments · Opened Dec 28, 2020

emscripten-core/emscripten

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