Change Details

`--memory-init-file 1` was previously ignored and `--memory-init-file 0` was the implicit behavior. To avoid confusing people, `emcc` now errors when `--memory-init-file` is passed at all. Here are some sources from Claude: > 1. GitHub Issue: https://github.com/emscripten-core/emscripten/issues/10622 - This GitHub issue discusses how memory init file generation is ignored in the WASM backend. > 2. Stack Overflow: https://stackoverflow.com/questions/78203093/the-memory-init-file-is-no-longer-supported - A 2024 Stack Overflow question specifically about this error. > 3. Panda3D Forum: https://discourse.panda3d.org/t/the-memory-init-file-is-no-longer-supported-emscripten/29978 - Another 2024 report of this issue. Depends on D15367

The new Emscripten has a number of changes. It modernizes its usage of JS, which requires some config updates. Unfortunately it also ends up requiring a lot more boilerplate, largely because our template hacks for vectors and optional no longer work. The idiomatic solution is to use `register_optional` and `register_vector`, but the former is annoying because it doesn't allow `null` and the latter is annoying because it corresponds to some specific vector type in JS instead of native arrays. Depends on D15367

`--memory-init-file 1` was previously ignored and `--memory-init-file 0` was the implicit behaviorThe new Emscripten has a number of changes. To avoid confusing peopleIt modernizes its usage of JS, `emcc` now errors when `--memory-init-file` is passed at allwhich requires some config updates. Here are some sources from Claude: > 1.Unfortunately it also ends up requiring a lot more boilerplate, GitHub Issue: https://github.com/emscripten-core/emscripten/issues/10622 - This GitHub issue discusses how memory init file generation is ignored in the WASM backend. > 2largely because our template hacks for vectors and optional no longer work. Stack Overflow: https://stackoverflow.com/questions/78203093/the-memory-init-file-is-no-longer-supported - A 2024 Stack Overflow question specifically about this error. > 3.The idiomatic solution is to use `register_optional` and `register_vector`, Panda3D Forum: https://discourse.panda3d.org/t/the-memory-init-file-is-no-longer-supported-emscripten/29978 - Another 2024 report of this issuebut the former is annoying because it doesn't allow `null` and the latter is annoying because it corresponds to some specific vector type in JS instead of native arrays. Depends on D15367