Arm compile

[Dan Ormsby]

I tried and failed to compile emscripten on a Raspberry Pi 4. Seems the emsdk install from github tried to download a Node build compiled for x86.

Is arm not a supported platform for emscripten? Or is there any advise to compile the latest emscripten on arm?

Cheers,
Dan.

[Alon Zakai]

That's correct, the emsdk only supports x64, as that's all we have builders for atm.

For arm, currently you need to build LLVM and Binaryen from source (unless there are arm builds for them somewhere - those would work, as emscripten has no local modifications to those projects, when using the upstream wasm backend).

- Alon

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[Dan Ormsby]

Thanks for the quick reply Alon. I’ve found an old build of emscripten is bundled in Raspbian, the Debian fork for Raspberry pi. Unfortunately it doesn’t compile code throwing a python error.

If I get a working compilation I’ll report back to the community on this forum.

Cheers,
Dan.

[Brion Vibber]

I have a provisional patch for emsdk which may help, please give a shout if you have troubles with it and I'll try to update it.

https://github.com/emscripten-core/emsdk/pull/277

Note that the llvm/clang compile takes a long time on rpi. :)

-- brion

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[Dan Ormsby]

Hi All,

I have successfully build emscripten from source on my Raspberry Pi 4 on the latest build of Raspbian. As the main repositories were updated I didn’t need to apply the patch Brion kindly suggested. Build time was about 3 hours.

Command lines after the git clone were simply...

./emsdk install sdk-incoming-32bit
./emsdk activate sdk-incoming-32bit
source ./emsdk_env.sh

Cheers,
Dan.