[Interest] appropriate versions of emscripten for 6.9

[Lorn Potter]

Hi,

To see what the wasm binaries were actually compiled with, look in 
include/QtCore/qconfig.h for QT_EMCC_VERSION


On 15/3/25 07:37, Glen Mabey wrote:
> Hello —
> I just downloaded the precompiled version of 6.9.0rc only to find that 
> the file
> QtPublicToolchainWasmHelpers
>  indicates 3.1.56 — I did a git pull on the 6.9.0 branch of qtbase/ 
> and it says 3.1.70
> Plz halp.
> Glen
>
> On Thu, Jan 30, 2025 at 5:47 AM Piotr Wierciński 
> <piotr.wiercinski at qt.io> wrote:
>
>     Hi!
>     The correct version of Emscripten for Qt 6.9 is 3.1.70, it has
>     been updated recently in `QtPublicToolchainWasmHelpers`.
>     As for support of JSPI, `-sASYNCIFY=2` should work in Emscricpten
>     3.1.56. However, in 3.1.59 it got deprecated in favor of `-sJSPI`
>     flag.
>     It is documented here:
>     https://github.com/emscripten-core/emscripten/blob/main/ChangeLog.md#3159---043024.
>     Please note that using JSPI requires enabling it via experimental
>     flag in Chrome.
>
>     There is still some work required for Qt to work smoothly with
>     JSPI, but we are on our way to get there.
>
>     Regards,
>     Piotr Wierciński
>
>
>     > -----Original Message-----
>     > From: Interest <interest-bounces at qt-project.org> On Behalf Of
>     Glen Mabey
>     > Sent: Thursday, January 23, 2025 6:41 PM
>     > To: interest at qt-project.org
>     > Subject: [Interest] appropriate versions of emscripten for 6.9
>     >
>     > It looks like (in QtPublicToolchainWasmHelpers.cmake) that the
>     official version of emsdk to use with 6.9 will be 3.1.56 (same as
>     6.8).
>     > I'm trying (unsuccessfully so far) to get a QFileDialog to pop
>     open from my QML app.
>     > I have been working to pursue the appropriate JSPI compile
>     options, yet it seems that it (-sASYNCIFY=2) isn't supported in
>     3.1.56.
>     > So, I realize that JSPI isn't necessarily going to be supported
>     in 6.9, but it's apparent (from the references to JSPI in the
>     docs) that y'all are working towards that destination eventually
>     (but not there yet).
>     > Or, is it just that QtPublicToolchainWasmHelpers.cmake needs to
>     be updated?
>     > If not, then is there an emscripten version that you *have* had
>     good success with?
>     >
>     > Best Regards,
>     > Glen
>
>
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