Produce a 'Dart Platform SDK' on the Dart bots

[mit-mit]

Motivation

Currently the Dart SDK contains several libraries and tools that are web specific. For products that embed the Dart SDK but which are not web oriented -- e.g. http://flutter.io -- these take up space, yet provide no value. It would be good to produce a more focused Platform SDK for these use cases.

Contents

The contents of the platform SDK should be the contents of the current Dart SDK with the following not included:

• /bin/
  • dart2js
  • snapshots/dart2js.dart.snapshot
  • dartdevc
  • snapshots/dartdevc.dart.snapshot
• /lib/
  • _blink
  • _chrome
  • html
  • indexed_db
  • js
  • js_util
  • svg
  • web_audio
  • web_gl
  • web_sql

Production

This platform SDK should be produced on the bots just like the current Dart SDK. It should also be uploaded to cloud storage like the current SDK.

Naming

The name of the produced .zip file should be dart-platform-sdk-<platform>-<architecture>-release.zip

The file should be uploaded to the storage bucket https://storage.googleapis.com/dart-archive/channels/<stable/dev>/release/<release>/platform-sdk/.

[mit-mit]

@kevmoo can you sanity check exclude lists above, please?

[rmacnak-google]

Note if you include the standalone VM (bin/dart) in this SDK variant, you should still keep lib/mirrors.

[mit-mit]

Ah, good catch the VM will indeed be there, updated!

[whesse]

@zanderso @rmacnak-google
The work to move the creation of the SDK to GN means that this will be created as a GN target, right?

[zanderso]

It's a bit simpler to choose the smaller SDK with GN argument rather than creating a new target for it, so that's what I'd like to do. I can wire up the GN argument to an environment variable in gn.py so that it's easier to set up on the bots.

Is it also possible to exclude the analyzer, analysis_server, front_end, and kernel sources in the small SDK?

https://codereview.chromium.org/2848943003/

[mit-mit]

Is it also possible to exclude the analyzer, analysis_server, front_end, and kernel sources in the small SDK?

I think Flutter needs those; @devoncarew?

[devoncarew]

Yup, at this point those are specifically there for use by Flutter. They use the sources from the sdk in preference to hosted - pub.dartlang.org - versions (@pq to confirm).

[zanderso]

Alright. I've updated the CL to make sure the sources are in there. The CL is ready for review, but I'll be OOO next week. I'll be able to address comments and land when I get back.

[pq]

They use the sources from the sdk in preference to hosted - pub.dartlang.org - versions (@pq to confirm).

👍 Spot on.

[zanderso]

After the above commit, when DART_MAKE_PLATFORM_SDK is in the environment on a gclient sync, or when --platform-sdk is passed to tools/gn.py, only the subset of the SDK described above will be built.