Reland: [infra] Roll clang to match the version used by Flutter

Reland: [infra] Roll clang to match the version used by Flutter

Flutter uses the same clang toolchain as Fuchsia. This CL puts Dart
on that toolchain, as well. This roll should entail no changes to
glibc version requirements on Linux.

The Fuchsia buildtools distribute clang-format with the toolchain
rather than separately, so this CL introduces forwarding scripts
that are copied to the right place under //buildtools.

This CL sets the default for the number of workers in //tools/gn.py
to 1, as the newer GN version fails occasionally when run
concurrently with other invocations.

As Flutter does, this CL uses the clang toolchain to build for
Android. Thus, it is now possible to build for Android on MacOS.

This change is a prerequisite for assembling the SDK in GN
rather than with a python script:

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

and will be nicer for making prebuilt SDKs for Fuchsia.

Committed: https://github.com/dart-lang/sdk/commit/6bf2c800fda97d21c439ee8e6d3decc8d2b727c6

[zra, 2017-05-03 22:42:22]

zra@google.com changed reviewers:
+ asiva@google.com

[zra, 2017-05-03 22:42:22]

TBR

[zra, 2017-05-03 22:42:51]

Description was changed from

==========
Reland: [infra] Roll clang to match the version used by Flutter

Flutter uses the same clang toolchain as Fuchsia. This CL puts Dart
on that toolchain, as well. This roll should entail no changes to
glibc version requirements on Linux.

The Fuchsia buildtools distribute clang-format with the toolchain
rather than separately, so this CL introduces forwarding scripts
that are copied to the right place under //buildtools.

This CL sets the default for the number of workers in //tools/gn.py
to 1, as the newer GN version fails occasionally when run
concurrently with other invocations.

As Flutter does, this CL uses the clang toolchain to build for
Android. Thus, it is now possible to build for Android on MacOS.

This change is a prerequisite for assembling the SDK in GN
rather than with a python script:

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

and will be nicer for making prebuilt SDKs for Fuchsia.
==========

to

==========
Reland: [infra] Roll clang to match the version used by Flutter

Flutter uses the same clang toolchain as Fuchsia. This CL puts Dart
on that toolchain, as well. This roll should entail no changes to
glibc version requirements on Linux.

The Fuchsia buildtools distribute clang-format with the toolchain
rather than separately, so this CL introduces forwarding scripts
that are copied to the right place under //buildtools.

This CL sets the default for the number of workers in //tools/gn.py
to 1, as the newer GN version fails occasionally when run
concurrently with other invocations.

As Flutter does, this CL uses the clang toolchain to build for
Android. Thus, it is now possible to build for Android on MacOS.

This change is a prerequisite for assembling the SDK in GN
rather than with a python script:

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

and will be nicer for making prebuilt SDKs for Fuchsia.

Committed:
https://github.com/dart-lang/sdk/commit/6bf2c800fda97d21c439ee8e6d3decc8d2b727c6
==========

[zra, 2017-05-03 22:42:52]

Committed patchset #1 (id:1) manually as
6bf2c800fda97d21c439ee8e6d3decc8d2b727c6 (presubmit successful).