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Jul 10

[PSA] Emscripten test suite now runs against a pinned emsdk version

This is a PSA for emscripten developers only. You can stop reading now if you don't work on

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[PSA] Emscripten test suite now runs against a pinned emsdk version

This is a PSA for emscripten developers only. You can stop reading now if you don't work on

Jul 10

Sam Clegg, … Mike7

Jul 10

[PSA] Moving away from .bat files on Windows

On Fri, Jul 10, 2026 at 11:36 AM Mike <sep...@gmail.com> wrote: I would say if the exe files

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[PSA] Moving away from .bat files on Windows

On Fri, Jul 10, 2026 at 11:36 AM Mike <sep...@gmail.com> wrote: I would say if the exe files

Jul 10

Kveon Lichman, … Sam Clegg12

Jul 8

WASMFS socket backend and WISP

On Tue, Jul 7, 2026 at 2:08 PM Kveon Lichman <kveo...@gmail.com> wrote: Yes, emscripten seems

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WASMFS socket backend and WISP

On Tue, Jul 7, 2026 at 2:08 PM Kveon Lichman <kveo...@gmail.com> wrote: Yes, emscripten seems

Jul 8

Phil Endecott, … Mike7

Jul 5

Changing shell.html without re-linking everything?

of course just use a different file to load the javascript glue file that is generated instead. the

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Changing shell.html without re-linking everything?

of course just use a different file to load the javascript glue file that is generated instead. the

Jul 5

Jun 22

[PSA] Emscripten 6.0.1 released

Continuing the experiment of using github releases. Details at https://github.com/emscripten-core/

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[PSA] Emscripten 6.0.1 released

Continuing the experiment of using github releases. Details at https://github.com/emscripten-core/

Jun 22

Александр Гурьянов, Sam Clegg8

Jun 17

UT99/emscripten Mutliplayer

Breakdown video: https://youtu.be/7NJIcI2ajgw сб, 15 нояб. 2025 г. в 12:04, Александр Гурьянов <

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UT99/emscripten Mutliplayer

Breakdown video: https://youtu.be/7NJIcI2ajgw сб, 15 нояб. 2025 г. в 12:04, Александр Гурьянов <

Jun 17

Guy Bedford, … Thomas Lively4

Jun 10

Supporting Emscripten on Tokio

> Is the idea to start with the single-threaded runtime and extend it with multithreaded support

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Supporting Emscripten on Tokio

> Is the idea to start with the single-threaded runtime and extend it with multithreaded support

Jun 10

Jun 9

[PSA] Emscripten 6.0.0 released

Windows users, I'm particularly interested in how the new `.exe` launcher files are working out.

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[PSA] Emscripten 6.0.0 released

Windows users, I'm particularly interested in how the new `.exe` launcher files are working out.

Jun 9

John Dallman, … Alon Zakai5

Jun 4

SINGLE_FILE: Is there a way to look at the wasm embedded in the .js file?

Strings definitely show up in the wasm binary, like they do in normal binaries. But function names

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SINGLE_FILE: Is there a way to look at the wasm embedded in the .js file?

Strings definitely show up in the wasm binary, like they do in normal binaries. But function names

Jun 4

John Dallman, Sam Clegg3

May 26

Dynamic Linking questions

Thanks, I will do some trials and discuss the trade-offs with my management. John On Fri, May 22,

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Dynamic Linking questions

Thanks, I will do some trials and discuss the trade-offs with my management. John On Fri, May 22,

May 26

May 20

PSA: Change in default behaviour `-shared`

Historically, emscripten has always produced fake dynamic libraries when the `-shared` flag was used.

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PSA: Change in default behaviour `-shared`

Historically, emscripten has always produced fake dynamic libraries when the `-shared` flag was used.

May 20

John Dallman, Alon Zakai3

May 20

EMULATE_FUNCTION_POINTER_CASTS and max-func-params

> Interesting, this means that your codebase has functions with 26 parameters, I'll believe

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EMULATE_FUNCTION_POINTER_CASTS and max-func-params

> Interesting, this means that your codebase has functions with 26 parameters, I'll believe

May 20

May 15

Suggestion: Clang warning specific to WebAssembly function signature matching

The codebase I'm porting to WebAssembly is mostly C, rather than C++, and parts of it are decades

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Suggestion: Clang warning specific to WebAssembly function signature matching

The codebase I'm porting to WebAssembly is mostly C, rather than C++, and parts of it are decades

May 15

Sam Clegg, Brooke Vibber5

Apr 30

[RFC] Dropping support for older browsers

OK, the PR for this is getting closer to landing: https://github.com/emscripten-core/emscripten/pull/

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[RFC] Dropping support for older browsers

OK, the PR for this is getting closer to landing: https://github.com/emscripten-core/emscripten/pull/

Apr 30

Thomas Grund, Sam Clegg3

Apr 25

Handling of while(Runnning) loops

Thanks for clarifying, that helps! Best, Thomas s...@google.com schrieb am Freitag, 24. April 2026 um

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Handling of while(Runnning) loops

Thanks for clarifying, that helps! Best, Thomas s...@google.com schrieb am Freitag, 24. April 2026 um

Apr 25

John Dallman, Alon Zakai5

Apr 10

Enhancement request for "RuntimeError: null function or function signature mismatch"

Good idea, we'll add mention of that flag here: https://github.com/emscripten-core/emscripten/

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Enhancement request for "RuntimeError: null function or function signature mismatch"

Good idea, we'll add mention of that flag here: https://github.com/emscripten-core/emscripten/

Apr 10

Sam Clegg, John Dallman4

Apr 10

[PSA] Plan to remove DETERMINISTIC setting

> BTW are you actually using this setting yourself? Not at present, but I can't rule out using

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[PSA] Plan to remove DETERMINISTIC setting

> BTW are you actually using this setting yourself? Not at present, but I can't rule out using

Apr 10

Apr 2

[RFC] Bumping the minimum supported version of Node from v12 to v18

Hi all, I'm considering bumping the minimum supported version of node (that emscripten can

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[RFC] Bumping the minimum supported version of Node from v12 to v18

Hi all, I'm considering bumping the minimum supported version of node (that emscripten can

Apr 2

leopatras, … Alon Zakai6

Feb 23

sqlite: SQL code runs slower on each iteration in Chrome if ASYNCIFY and IDBFS are used

> IDBFS seems to show only spikes of activity with big pauses in-between IDBFS is async - that

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sqlite: SQL code runs slower on each iteration in Chrome if ASYNCIFY and IDBFS are used

> IDBFS seems to show only spikes of activity with big pauses in-between IDBFS is async - that

Feb 23

John Dallman, Sam Clegg3

Feb 16

Forwards/backwards compatibility between Emscripten versions?

OK, that makes sense. Thanks, John On Mon, Feb 16, 2026 at 1:31 AM 'Sam Clegg' via emscripten

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Forwards/backwards compatibility between Emscripten versions?

OK, that makes sense. Thanks, John On Mon, Feb 16, 2026 at 1:31 AM 'Sam Clegg' via emscripten

Feb 16

John Dallman, Sam Clegg5

Feb 11

Is there a published support lifecycle for Emscripten?

On Tue, Feb 10, 2026 at 6:46 PM 'Sam Clegg' via emscripten-discuss <emscripten-discuss@

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Is there a published support lifecycle for Emscripten?

On Tue, Feb 10, 2026 at 6:46 PM 'Sam Clegg' via emscripten-discuss <emscripten-discuss@

Feb 11

Jan 26

[PSA] emscripten 5.0

Hi all, We just released emscripten 5.0. Mostly by coincidence it's the first release of the new

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[PSA] emscripten 5.0

Hi all, We just released emscripten 5.0. Mostly by coincidence it's the first release of the new

Jan 26

leopatras, Sam Clegg3

Jan 26

emcc: compiling with fsanitize=address and async function raises compile error

Thanks Sam, I tried your workaround ,but it just adds some underscores to the error error: undefined

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emcc: compiling with fsanitize=address and async function raises compile error

Thanks Sam, I tried your workaround ,but it just adds some underscores to the error error: undefined

Jan 26

Sahil Gautam, Sam Clegg7

12/15/25

--preload-file doesn't work when passed to target_link_options in cmake

that's much better, thanks! On Tuesday, December 16, 2025 at 2:10:25 AM UTC+5:30 s...@google.com

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--preload-file doesn't work when passed to target_link_options in cmake

that's much better, thanks! On Tuesday, December 16, 2025 at 2:10:25 AM UTC+5:30 s...@google.com

12/15/25

chris goyette, … Brooke Vibber5

12/10/25

Any deep-dive learning resources for Emscripten?

On Wed, Dec 10, 2025 at 8:38 AM chris goyette <chrisgoy...@gmail.com> wrote: What I do not

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Any deep-dive learning resources for Emscripten?

On Wed, Dec 10, 2025 at 8:38 AM chris goyette <chrisgoy...@gmail.com> wrote: What I do not

12/10/25

Александр Гурьянов, Brendan Dahl2

12/3/25

Replacing Asyncify with JSPI (js-dos / dosbox)

It looks like the wasm entry function is missing it's JSPI wrapper. You should add `SHELL_Init` (

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Replacing Asyncify with JSPI (js-dos / dosbox)

It looks like the wasm entry function is missing it's JSPI wrapper. You should add `SHELL_Init` (

12/3/25

Dale Pennington, Sam Clegg4

12/1/25

Seeing symbols in emcc generated object files.

I have figured out the issue is with the AUTOMOC tool that Qt provides and CMake uses that is the

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Seeing symbols in emcc generated object files.

I have figured out the issue is with the AUTOMOC tool that Qt provides and CMake uses that is the

12/1/25

John Dallman, … Alon Zakai7

12/1/25

Optimisation and assertions

"no output file specified" can be ignored, but I am confused why it appears... I can't

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Optimisation and assertions

"no output file specified" can be ignored, but I am confused why it appears... I can't

12/1/25

John Dallman, Sam Clegg4

11/29/25

WebAssembly needs correct function pointer types

On Thu, Nov 27, 2025 at 8:59 AM John Dallman <jgdats...@gmail.com> wrote: On Wed, Nov 26,

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WebAssembly needs correct function pointer types

On Thu, Nov 27, 2025 at 8:59 AM John Dallman <jgdats...@gmail.com> wrote: On Wed, Nov 26,

11/29/25

John Dallman, Sam Clegg3

11/19/25

How to turn off caching?

Sorry I didn't finish typing my response. If you build the same program 3 times in row like this:

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How to turn off caching?

Sorry I didn't finish typing my response. If you build the same program 3 times in row like this:

11/19/25

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