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

Performance drop since 2.0.2 release Open

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

emscripten-core/emscripten#13796 · 7 comments · Opened Mar 30, 2021
Is there a read-only FileSystem mode? Open

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

emscripten-core/emscripten#13781 · 4 comments · 1 reaction · Opened Mar 27, 2021
Malloc and free operations seem to be deadlocked Open

wontfix

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

emscripten-core/emscripten#13780 · 4 comments · Opened Mar 26, 2021
File system much slower than expected Open

wontfix

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

emscripten-core/emscripten#13758 · 1 comment · Opened Mar 24, 2021
Distinction of main browser and main runtime thread in threading.h Open

wontfix

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

emscripten-core/emscripten#13756 · 2 comments · Opened Mar 24, 2021
sdl2: ReferenceError: screen is not defined Open

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

emscripten-core/emscripten#13755 · 6 comments · Opened Mar 24, 2021
autotools m4 breakage from v2.0.12 to v2.0.13 Open

wontfix

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

emscripten-core/emscripten#13753 · 18 comments · Opened Mar 24, 2021
Emscripten fetch API won't invoke callback if the calling thread is in waiting. Open

wontfix

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

emscripten-core/emscripten#13752 · 11 comments · Opened Mar 24, 2021
WASM_OBJECT_FILES=1 deprecated? Open

wontfix

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

emscripten-core/emscripten#13742 · 3 comments · Opened Mar 23, 2021
__set_stack_limits not found in SIDE_MODULE=2 Open

wontfix

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

emscripten-core/emscripten#13709 · 10 comments · 1 reaction · Opened Mar 19, 2021
C++ static initialization + dynamic libraries lead to a function signature mismatch error Open

wontfix

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

emscripten-core/emscripten#13705 · 1 comment · Opened Mar 18, 2021
glGetActiveUniformBlockiv returns invalid value if GL_UNIFORM_BLOCK_BINDING is 0 Open

wontfix

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

emscripten-core/emscripten#13701 · 1 comment · Opened Mar 18, 2021
sudo: emcmake: command not found Open

wontfix

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

emscripten-core/emscripten#13700 · 2 comments · Opened Mar 18, 2021
Memory leak in webgl. canvases are never garbage collected. WebGLUniformLocations Open

wontfix

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

emscripten-core/emscripten#13697 · 3 comments · Opened Mar 18, 2021
Canary doesn't load dwarf symbols with "-g4 --source-map-base" Open

good first bug help wanted

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

emscripten-core/emscripten#13687 · 5 comments · Opened Mar 17, 2021
Wasm blocks the input of <Input /> and <Textarea /> in html. Open

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

emscripten-core/emscripten#13675 · 2 comments · Opened Mar 16, 2021
Document debug-fission and llvm-dwp usage Open

wontfix

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

emscripten-core/emscripten#13662 · 1 comment · Opened Mar 15, 2021
Use OffscreenCanvas instead of `--proxy-to-worker` Open

wontfix

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

emscripten-core/emscripten#13652 · 5 comments · Opened Mar 12, 2021
fread returns garbage when pipe is closed Open

help wanted wontfix

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

emscripten-core/emscripten#13645 · 3 comments · Opened Mar 12, 2021
import_name/import_module correctly name imports, but are still reported as undefined symbols when linking with STANDALONE_WASM Open

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

emscripten-core/emscripten#13641 · 3 comments · 2 reactions · Opened Mar 10, 2021
undefined symbol `__assert_fail` when build main module Open

wontfix

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

emscripten-core/emscripten#13633 · 8 comments · Opened Mar 10, 2021
How to unzip using fetch API Open

wontfix

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

emscripten-core/emscripten#13620 · 1 comment · Opened Mar 8, 2021
Problems in passing data from JS to C++ Open

wontfix

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

emscripten-core/emscripten#13614 · 1 comment · Opened Mar 6, 2021
Adding a documentation page on all possible emcc compiler flags Open

wontfix

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

emscripten-core/emscripten#13575 · 2 comments · Opened Mar 1, 2021
Splitting WASI into side modules, dynamic linking Open

wontfix

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

emscripten-core/emscripten#13566 · 1 comment · 2 reactions · Opened Feb 25, 2021
swscanf returns EOF (-1) if input string contains characters > 0x7F Open

wontfix

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

emscripten-core/emscripten#13565 · 1 comment · Opened Feb 25, 2021
emconfigure fails inside "type": "module" package Open

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

emscripten-core/emscripten#13551 · 4 comments · 3 reactions · Opened Feb 23, 2021
firefox cannot preload bitmap files Open

wontfix

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

emscripten-core/emscripten#13550 · 1 comment · Opened Feb 23, 2021
EM++ error: Unexpected arg0 type ((select unexpected expression type Open

wontfix

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

emscripten-core/emscripten#13546 · 4 comments · Opened Feb 22, 2021
emcc compile fails on openGL's symbol glLoadMatrixf Open

wontfix

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

emscripten-core/emscripten#13545 · 4 comments · Opened Feb 21, 2021
set -s EMULATE_FUNCTION_POINTER_CASTS=1 and the pthread will not work Open

wontfix

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

emscripten-core/emscripten#13543 · 3 comments · Opened Feb 20, 2021
fatal error: error in backend: Cannot use EM_ASM* alongside setjmp/longjmp Open

wontfix

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

emscripten-core/emscripten#13542 · 3 comments · Opened Feb 20, 2021
Storage Foundation emscripten filesystem for multi-threaded apps not working Open

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

emscripten-core/emscripten#13519 · 2 comments · Opened Feb 17, 2021
Enable REVERSE_DEPS=all on O0/O1 Open

wontfix

emscripten-core/emscripten#13510 · 21 comments · 1 assignee · Opened Feb 16, 2021
embind should use the length that std::string already knows Open

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

emscripten-core/emscripten#13500 · 4 comments · Opened Feb 15, 2021
pb duplicate interface between idl file and wrapper Open

wontfix

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

emscripten-core/emscripten#13496 · 1 comment · Opened Feb 14, 2021
Embind modules vs no modules Open

wontfix

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

emscripten-core/emscripten#13495 · 1 comment · 5 reactions · Opened Feb 14, 2021
Bad file descriptor errors -- How are file descriptors stored in WASM module? Open

wontfix

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

emscripten-core/emscripten#13491 · 4 comments · Opened Feb 13, 2021
Regression: JS preprocessor is run on HTML files, failing on CSS styles Open

wontfix

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

emscripten-core/emscripten#13488 · 2 comments · Opened Feb 12, 2021
Support Uint8Array instances as Module.stdin and as Module's stdout/stderr Open

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

emscripten-core/emscripten#13476 · 7 comments · Opened Feb 11, 2021
Not building libfetch Open

wontfix

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

emscripten-core/emscripten#13473 · 2 comments · Opened Feb 11, 2021
Include virtual /etc/passwd file with web_user Open

wontfix

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

emscripten-core/emscripten#13466 · 2 comments · Opened Feb 10, 2021
Sphinx-build is not warnings clean Open

wontfix

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

emscripten-core/emscripten#13463 · 2 comments · Opened Feb 10, 2021
Building an existing project (json-c) for wasm Open

wontfix

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

emscripten-core/emscripten#13456 · 3 comments · Opened Feb 9, 2021
Size profiler for wasm Open

wontfix

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

emscripten-core/emscripten#13446 · 2 comments · Opened Feb 8, 2021
Latest emsdk fails with Python 3.7.8 on Windows 10 Open

wontfix

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

emscripten-core/emscripten#13433 · 5 comments · Opened Feb 6, 2021
Audio Stream to forward to WebRTC Open

wontfix

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

emscripten-core/emscripten#13432 · 2 comments · Opened Feb 6, 2021
SDL_TTF and freetype not building with PTHREADS Open

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

emscripten-core/emscripten#13402 · 2 comments · 3 reactions · Opened Feb 2, 2021
Fetch throws on staticInit when browser content blocking is in place Open

wontfix

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

emscripten-core/emscripten#13401 · 1 comment · Opened Feb 2, 2021
Add emserve tool Open

wontfix

Difficulty 5/5 Over a week Newbie friendliness 28/100

emscripten-core/emscripten#13376 · 5 comments · 1 reaction · Opened Jan 29, 2021

emscripten-core/emscripten

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