"dart run dart2wasm.dart" broken about sdk HOT 2 CLOSED

I think this was 110219a. I just pass --libraries-path <absolute-path-to-libraries.json>. This workflow of running dart2wasm from source is probably not supported for end users but if possible fixing this should be convenient for devs.

from sdk.

The dart2wasm.dart script had some assumption about where the sdk can be found relative to Platform.script. This is very problematic as Platform.script is different if dart2wasm is e.g. AOT compiled / imported / ... Also this assumption about finding sdk dir was used to supply the sdk dir to CFE (even though we should use platform or libraries spec instead).

This was cleaned up in 328ae02

@biggs0125 I strongly encourage following the documentation and use pkg/dart2wasm/tool/compile_benchmark / pkg/dart2wasm/tool/run_benchmark scripts. They have everything needed. You can give the former the --src argument and it will run from source.

The actual end-user tools (dart compile wasm and flutter build web --wasm (as well as pkg/dart2wasm/tool/compile_benchmark) ensure to use the lower-level dart2wasm.dart in the right way). Though I've uploaded cl/369024 to print a more meaningful error.

from sdk.