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Emscripten compilation & linking [message #61970]

Fri, 10 April 2026 23:55

frederik.dumarey
Messages: 38
Registered: December 2021
Location: Belgium

Member

I'm trying to use TheIDE as build method for emcc.

Emcc has been setup correctly, with all path environment variables. So emcc --version is working fine.

I added a build method with some settings:
builder: gcc
compiler name: emcc
common options: -o output.html
common c++ options: -s WASM=1 -O3
INCLUDE dir to emscripten\system\include
BIN dir to emscripten\system\bin

But when I'm building using this method CTRL-F7 or F7 I get some directories created, but never the html,js and wasm files.

Regards,

Frederik Dumarey
Belgium

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Re: Emscripten compilation & linking [message #61971 is a reply to message #61970]

Sat, 11 April 2026 10:51

Oblivion
Messages: 1270
Registered: August 2007

Senior Contributor

Hi Frederik,

Unless you're trying to compile U++ into wasm (good news, I am porting it to it and Core is already ported), here's what you need:

WASM=1 is default, you don't need to explicity set it.
In link options set: -sENVIRONMENT=web

If you are compiling a cpp project, use em++ instead of emcc.

Don't set the -o in builder. Instead, in output mode, set the target file override to myfile.js.
E.g:

/forums/index.php?t=getfile&id=7149&private=0

/forums/index.php?t=getfile&id=7149&private=0

Path:
PATH = "/usr/lib/emscripten;/usr/lib/emscripten/system/bin";

Path:
LIB = "/usr/lib/emscripten/system/lib;/lib";

This is for archlinux, but the correct paths should be similar in other distros or on windows.

Best regards,
Oblivion

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[Updated on: Sat, 11 April 2026 10:52]

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Re: Emscripten compilation & linking [message #61972 is a reply to message #61971]

Sat, 11 April 2026 16:31

frederik.dumarey
Messages: 38
Registered: December 2021
Location: Belgium

Member

Hello Oblivion,

Thanks! Works perfectly.
Great to read that Core is already ported, can't wait to see CtrlLib ported too Wink

With your settings you get the Javascript and the Wasm file right, if somebody wants a html test file, just add the -o output.html setting, and you get a html file which you can serve using a local web server with python -m http.server [port]. Run the last command in the directory where the html, js and wasm file have been compiled.

This will be added to the book. Just for your information: I also made an example with the SDL library for a GUI tutorial, also working fine with this options.

Regards,
Frederik.

Regards,

Frederik Dumarey
Belgium

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Re: Emscripten compilation & linking [message #62027 is a reply to message #61970]

Sat, 27 June 2026 22:17

Oblivion
Messages: 1270
Registered: August 2007

Senior Contributor

Long time no news. Until now. Smile

Another milestone reached on the WebAssembly front: Draw and Painter are now native WASM citizens.
The road has been long, but the results speak for themselves: full 2D rendering, right in the browser, powered by U++. Cool