Add full support for dart 2.0 mode in command line Dart and SDK

[a-siva]

This is a meta bug to track support for dart 2.0 mode in command line Dart and SDK.
The idea is we need to get to a point where one could say
dart --preview-dart-2 hello.dart
and it works.

[a-siva]

Related bugs that should be addressed for this support to be complete

• simplify dart 2.0 command line execution  #31808 (simplify dart 2.0 command line execution)
• [VM] make --strong without --dfe an error #31561 (make --strong without --dfe an error)
• VM: report error if input .dill file is missing the sdk and --kernel-binaries was not provided #30151 (report error if input .dill file is missing the sdk and kernel binaries are not provided)
• switch to incremental compiler for kernel-service #31146 (switch to incremental compiler for kernel-service)
• Kernel mode should retain the existing support we have for Dart API #29989 (dart 2.0 should retain the existing support we have for Dart API)

Other FE issues that need to be fixed to get to being fully functional

• add support for dart-ext uri's  #31618 (add support for dart-ext uris)
• add support for data:* URIs #31594 (add support for data:* uris)
• Can we add a tag in the header of a kernel file to indicate if it is a full kernel file or an incremental kernel file #31545 (add a tag in the header of a kernel file)

Steps for later once the kernel format has stabilized

• Add support in the dart VM build process to enable boot strapping of the Dart Front End #30374 (add support in the dart VM build process to enable boot strapping of the Dart Front End)

[devoncarew]

For my own edification, the current way to run the VM with the CFE is using the script pkg/vm/tool/dart2.

[zoechi]

Will Dart2 run Dart1 programs or
will there be a way to have Dart1 and Dart2 installed at the same time?

[dgrove]

The SDK is gradually moving to running Dart 2 only. As the SDK gets to Dart 2 only, you'd need a separate SDK installed to run Dart 1.

[zoechi]

Don't you think this will cause issues if people use Dart apps that are not yet ported?
There can't be 2 dart.exe in the path at the same time.
Sorry for the noise in this thread, is it worth creating a new issue for that?

[dgrove]

Can you open a new issue?

…

On Wed, Jan 10, 2018 at 11:31 PM, Günter Zöchbauer ***@***.*** > wrote: Don't you think this will cause issues if people use Dart apps that are not yet ported? There can't be 2 dart.exe in the path at the same time. Sorry for the noise in this thread, is it worth creating a new issue for that? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#31807 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACAsWyJBkE77_qnWkA6Zv4GhHFOVZTXfks5tJbjHgaJpZM4RYA_i> .

[devoncarew]

@a-siva, it looks like dart --preview-dart-2 hello.dart is working now; is that correct?

[a-siva]

Not yet, we are still one CL away from it, --strong and --reify-generic-methods is not on when --preview-dart-2 is specified.

[a-siva]

This is done.