Compiling QT on ubuntu/ARM for WASM

dreamlax

I am trying to compile QT for Webassembly. I cloned the QT source code from code.qt.io/qt/qt5.git and checked out version 5.15. I am using emcc/em++ version 2.0.13 with clang version 13.0.0.

In build directory I ran configure as follows:

../qt5/configure -opensource -confirm-license -xplatform wasm-emscripten -feature-thread -nomake examples -no-dbus -no-ssl -prefix $PWD/../qt5_wasm_binaries

followed by make.
There are two issues: One, I see a lot of files being compiled with gcc instead of emcc. Second the build fails with the error:

make[3]: *** No rule to make target 'qt5widgets_metatypes.json', needed by '../../lib/libQt5Widgets.a'.

I feel I am missing some steps. Would be great to get some help on this.

Thanks

SGaist

Hi and welcome to devnet,

By default when you clone the Qt repo, it's on the dev branch that means it's for Qt 6. Did you explicitly checkout Qt 5.15 ?

raven-worx

@dreamlax said in Compiling QT on ubuntu/ARM for WASM:

One, I see a lot of files being compiled with gcc instead of emcc.

this is ok, since the host binaries (moc, rcc, etc.) are compiled with gcc.

lorn.potter

Emscripten does not run on native arm on any OS. On Mac M1, it requires the Rosetta 2 emulation to work.

"emsdk only officially supports x86_64 today."
https://github.com/emscripten-core/emsdk/issues/671