[Web] Update minimum requirements for emscripten to 3.1.62

[adamscott]

This PR updates the minimum requirements for emscripten to 3.1.62

See godotengine/godot-cpp#1566 (comment) for more context.
tl;dr: Godot-cpp requires emscripten >= 3.1.62 to compile, why not set the same for the main project.

[akien-mga]

I'm not too keen on dropping support for older compiler versions generally, especially versions as recent as just a couple months old.

But if both @Faless and @adamscott think it's a good idea, I'm fine. Emscripten is relatively easy to update / use different versions for different projects, so I guess it's not too big a hassle for users to have to update.

[adamscott]

I'm not too keen on dropping support for older compiler versions generally, especially versions as recent as just a couple months old.

Are other compilers update at the same rhythm as emscripten? And is emscripten the outlier in version checks for flags? (from a quick check, there's only the Linux build that has a cc_semver check for gcc >= 12.1 if using mold)

We obviously don't test every version of emscripten. It makes things kinda hard to maintain, isn't it?

[akien-mga]

Bump, review feedback still needs to be addressed.

[Faless]

Emscripten is relatively easy to update / use different versions for different projects, so I guess it's not too big a hassle for users to have to update.

My feeling is that we should always try to stay close to the latest version. The reason is that the whole WASM ecosystem is still evolving, with parts being understandardized and left to tool conventions including things like the metadata format for dynamic linking.

You don't usually expect your application to break if you use an older or newer toolchain (when GCC did that it was a big fuss ).

Emscripten, on the other hand, constantly changes flags, add/remove functionalities, and, more importantly, changes the runtime.

Part of the heavy lifting emscripten does, is providing a "unix-like" runtime (file system, opengl abstraction, threads, etc).

The runtime is constantly changing, using more modern APIs, converting things that had to be done in JS to WASM (because new WASM specs comes out), etc.

This means that using old versions, will most likely produce worse, less performant binaries.

In some cases (e.g. audio), old versions, may use now deprecated APIs, that would either no longer work, or have terrible performance in browsers (which no longer care about support them since they are deprecated).

[Faless]

LGTM

[akien-mga]

Thanks!

[dustdfg]

Debian 12 now can't build godot for web :/

[Faless]

I regularly build from Debian 12. Use emsdk to install a recent version of the emscripten toolchain https://github.com/emscripten-core/emsdk . The version in Debian would have produced broken builds anyway for some configuration (e.g. dlink+thread).

…

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