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

Efficiently using memory with wasm/asmjs? Open

wontfix

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

emscripten-core/emscripten#13117 · 2 comments · Opened Dec 28, 2020
Allocate arguments (argv) on stack in a single contiguous chunk Open

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

emscripten-core/emscripten#13106 · 4 comments · Opened Dec 24, 2020
does emscripten tracing API supports node environment? Open

wontfix

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

emscripten-core/emscripten#13102 · 1 comment · Opened Dec 23, 2020
EMSCRIPTEN_FETCH_NO_DOWNLOAD still attempts http get Open

wontfix

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

emscripten-core/emscripten#13096 · 1 comment · Opened Dec 23, 2020
CMake emscripten flags -s with no space not working on Windows Open

wontfix

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

emscripten-core/emscripten#13095 · 4 comments · Opened Dec 22, 2020
`-gseparate-dwarf` contains copy of the original .wasm file Open

emscripten-core/emscripten#13084 · 14 comments · 1 assignee · Opened Dec 22, 2020
Fatal: globalBase must be set Open

wontfix

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

emscripten-core/emscripten#13082 · 5 comments · Opened Dec 21, 2020
tests fail: Checking JS engine ['/usr/local/bin/node'] failed. Open

wontfix

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

emscripten-core/emscripten#13081 · 2 comments · Opened Dec 21, 2020
build error Open

wontfix

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

emscripten-core/emscripten#13077 · 7 comments · Opened Dec 21, 2020
EMULATE_FUNCTION_POINTER_CASTS + dlsym breaks Open

wontfix

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

emscripten-core/emscripten#13076 · 7 comments · Opened Dec 21, 2020
Dynamic Libraries: RuntimeError function signature mismatch Open

wontfix

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

emscripten-core/emscripten#13073 · 5 comments · Opened Dec 18, 2020
wasm-ld: error: failed to write the output file: permission denied Open

help wanted

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

emscripten-core/emscripten#13067 · 36 comments · Opened Dec 17, 2020
installing on windows does not work Open

wontfix

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

emscripten-core/emscripten#13066 · 3 comments · Opened Dec 17, 2020
I can't know the params When I debug the wasm with .map file. Open

wontfix

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

emscripten-core/emscripten#13064 · 3 comments · Opened Dec 17, 2020
Can't install tools Open

wontfix

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

emscripten-core/emscripten#13058 · 10 comments · Opened Dec 16, 2020
Keeping Reference to JS Function Wrapped by embind val Open

wontfix

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

emscripten-core/emscripten#13055 · 2 comments · Opened Dec 16, 2020
Invalid Asyncify stack when using dlopen() with SIDE_MODULE and asyncify imports Open

asyncify

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

emscripten-core/emscripten#13049 · 4 comments · Opened Dec 15, 2020
Code coverage Open

help wanted

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

emscripten-core/emscripten#13046 · 11 comments · Opened Dec 15, 2020
emscripten_realloc_buffer heap grow error Open

wontfix

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

emscripten-core/emscripten#13045 · 2 comments · Opened Dec 15, 2020
LinkError: WebAssembly.instantiate(): Import #0 module="env" function="_malloc" error: function import requires a callable Open

wontfix

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

emscripten-core/emscripten#13036 · 5 comments · Opened Dec 14, 2020
MEMFS crashes when writing large file Open

good first bug help wanted wontfix

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

emscripten-core/emscripten#13028 · 1 comment · Opened Dec 13, 2020
Random "function signature mismatch" with dynamic libraries + Embind Open

wontfix

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

emscripten-core/emscripten#13026 · 1 comment · Opened Dec 12, 2020
Building cURL: file descriptor issues Open

wontfix

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

emscripten-core/emscripten#13025 · 4 comments · Opened Dec 12, 2020
Is it legal to use Asyncify outside of a main loop? Open

asyncify

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

emscripten-core/emscripten#13014 · 3 comments · Opened Dec 11, 2020
OpenGL legacy emulation, weird WebGL error: GL_INVALID_VALUE: Index must be less than MAX_VERTEX_ATTRIBS Open

wontfix

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

emscripten-core/emscripten#13011 · 1 comment · Opened Dec 11, 2020
Compiler information extraction significantly slower compared to vanilla Clang Open

help wanted wontfix

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

emscripten-core/emscripten#13004 · 8 comments · Opened Dec 10, 2020
[DOCU] Small description issue in fetch.h (requestHeaders) Open

wontfix

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

emscripten-core/emscripten#13001 · 1 comment · Opened Dec 9, 2020
How to handle exceptions that occur in pthreads (workers) Open

wontfix

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

emscripten-core/emscripten#13000 · 2 comments · Opened Dec 9, 2020
"WebAssembly Fix Irreducible Control Flow" pass causes OOM on a huge function Open

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

emscripten-core/emscripten#12992 · 7 comments · Opened Dec 8, 2020
Is WebAssembly slower than NaCl ? Open

wontfix

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

emscripten-core/emscripten#12989 · 6 comments · 2 reactions · Opened Dec 7, 2020
Terminate'ing doesn't prevent subsequent code execution Open

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

emscripten-core/emscripten#12987 · 3 comments · Opened Dec 7, 2020
duplicate symbol errors with -s OFFSCREEN_FRAMEBUFFER Open

wontfix

Difficulty 3/5 1-2 days Newbie friendliness 28/100

emscripten-core/emscripten#12983 · 2 comments · Opened Dec 6, 2020
SDL_VIDEORESIZE only fires when using deprecated emscripten_set_canvas_size API Open

wontfix

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

emscripten-core/emscripten#12978 · 2 comments · Opened Dec 5, 2020
Function signature mismatch Open

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

emscripten-core/emscripten#12950 · 19 comments · Opened Dec 3, 2020
`exit()` under node does not obey `EXIT_RUNTIME` Open

wontfix

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

emscripten-core/emscripten#12945 · 3 comments · Opened Dec 2, 2020
clang-12: error: no such file or directory: '/local/emsdk/upstream/lib/clang/12.0.0/share/cfi_blacklist.txt' Open

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

emscripten-core/emscripten#12943 · 4 comments · Opened Dec 2, 2020
relocation R_WASM_MEMORY_ADDR_TLS_SLEB cannot be used against `__THREW__` in non-TLS section: .bss Open

wontfix

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

emscripten-core/emscripten#12941 · 30 comments · Opened Dec 2, 2020
std::filesystem::permissions() does not give me the correct permission value Open

help wanted wontfix

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

emscripten-core/emscripten#12932 · 11 comments · Opened Dec 1, 2020
Failures against Content Security Policy of your site blocks the use of 'eval' in JavaScript Open

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

emscripten-core/emscripten#12910 · 5 comments · Opened Nov 29, 2020
order of unordered_map is reverse Open

wontfix

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

emscripten-core/emscripten#12909 · 2 comments · Opened Nov 29, 2020
Emrun only displays stderr in the console, but not in the html output textarea Open

wontfix

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

emscripten-core/emscripten#12897 · 2 comments · Opened Nov 27, 2020
Recent Emscripten versions no longer work on Netlify builders Open

wontfix

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

emscripten-core/emscripten#12896 · 14 comments · Opened Nov 27, 2020
getsockname and gepeername of "POSIX TCP Sockets over WebSockets" get stuck during exchange with proxy server Open

wontfix

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

emscripten-core/emscripten#12895 · 1 comment · Opened Nov 27, 2020
error: undefined symbol: ldexpf (referenced by top-level compiled C/C++ code)jtgjio Open

wontfix

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

emscripten-core/emscripten#12893 · 5 comments · Opened Nov 27, 2020
emscripten_lazy_load_code causes errors on re-entry Open

wontfix

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

emscripten-core/emscripten#12891 · 3 comments · Opened Nov 26, 2020
Can't build GNU diffutils with emscripten Open

wontfix

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

emscripten-core/emscripten#12879 · 9 comments · Opened Nov 24, 2020
Is it possible to get a typed_memory_view that is a Uint8ClampedArray? Open

wontfix

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

emscripten-core/emscripten#12878 · 2 comments · Opened Nov 24, 2020
warning: indirection of non-volatile null pointer will be deleted, not trap Open

wontfix

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

emscripten-core/emscripten#12876 · 1 comment · Opened Nov 24, 2020
How to setup webgl 2.0 context with SDL2 in c++? Open

wontfix

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

emscripten-core/emscripten#12875 · 3 comments · Opened Nov 24, 2020
postabmble.js generated code run(args): the args not take in effect Open

wontfix

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

emscripten-core/emscripten#12873 · 1 comment · Opened Nov 24, 2020

emscripten-core/emscripten

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