[Interest] appropriate versions of emscripten for 6.9

[Morten Sørvig]

Hello!

For accessing local files QFileDIalog::getOpenFileContent() is your best option with Qt today. The tradeoff is that it reads the entire file info memory and returns a QByteArray. If you have existing QFile-based code that you want to reuse then you can save that QByteArray to /tmp/ (which is backed by Emscripten's in-memory file system, inside the web sandbox).

JSPI support is in the works. We are also waiting for native browser support, and you do need a somewhat recent Emscripten version. Note that JSPI alone is not sufficient to enable local file access using the standard QFileDialog API, we most likely also need a custom file engine of some sort.

Regards,
Morten


> On 23 Jan 2025, at 18:40, Glen Mabey <gmabey at gmail.com> wrote:
> 
> 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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