Bazel release 0.20.0

[Dmitry Lomov]

Bazel 0.20.0 is now available for general usage at:

  https://github.com/bazelbuild/bazel/releases/tag/0.20.0

 

If you observe any regression, please report it to

https://github.com/bazelbuild/bazel/issues as soon as possible.

 

The release notes for version 0.20.0 are:

 

# Release 0.20.0 (2018-11-30)

 

Baseline: 7bf7f031c332dc483257248d1c1f98ad75bbc83b

 

Cherry picks:

 

   + fd52341505e725487c6bc6dfbe6b5e081aa037da:

     update bazel-toolchains pin to latest release Part of changes to

     allow bazelci to use 0.19.0 configs. RBE toolchain configs at or

     before 0.17.0 are not compatible with bazel 0.19.0 or above.

   + 241f28d05424db2d11ee245dc856b992258505e3:

     Revert "Toggle --incompatible_disable_late_bound_option_defaults

     flag."

   + f7e5aef145c33968f658eb2260e25630dc41cc67:

     Add cc_toolchain targets for the new entries in the default

     cc_toolchain_suite.

   + d2920e32ec7f3f8551a693d33c17b19f1b802145:

     Revert "WindowsFileSystem: open files with delete-sharing"

 

[Breaking changes in 0.20](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Abreaking-change-0.20)

 

  - [--incompatible_remove_native_http_archive](https://github.com/bazelbuild/bazel/issues/6570).

  - [--incompatible_remove_native_git_repository](https://github.com/bazelbuild/bazel/issues/6569).

  - [--incompatible_disable_cc_toolchain_label_from_crosstool_proto](https://github.com/bazelbuild/bazel/issues/6434).

  - [--incompatible_disable_depset_in_cc_user_flags](https://github.com/bazelbuild/bazel/issues/6384).

  - [--incompatible_disable_cc_configuration_make_variables](https://github.com/bazelbuild/bazel/issues/6381).

  - [--incompatible_disallow_conflicting_providers](https://github.com/bazelbuild/bazel/issues/5902).

  - [--incompatible_range_type](https://github.com/bazelbuild/bazel/issues/5264).

 

[0.20 is a migration window for the following changes](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Amigration-0.20)

 

  - [--incompatible_use_jdk10_as_host_javabase](https://github.com/bazelbuild/bazel/issues/6661)

  - [--incompatible_use_remotejdk_as_host_javabase](https://github.com/bazelbuild/bazel/issues/6656)

  - [--incompatible_disable_sysroot_from_configuration](https://github.com/bazelbuild/bazel/issues/6565)

  - [--incompatible_provide_cc_toolchain_info_from_cc_toolchain_suite](https://github.com/bazelbuild/bazel/issues/6537)

  - [--incompatible_disable_depset_in_cc_user_flags](https://github.com/bazelbuild/bazel/issues/6383)

  - [--incompatible_package_name_is_a_function](https://github.com/bazelbuild/bazel/issues/5827)

 

[Breaking changes in the next release (0.21)](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Abreaking-change-0.21)

 

  - [--incompatible_use_jdk10_as_host_javabase](https://github.com/bazelbuild/bazel/issues/6661)

  - [--incompatible_use_remotejdk_as_host_javabase](https://github.com/bazelbuild/bazel/issues/6656)

  - [--incompatible_disable_sysroot_from_configuration](https://github.com/bazelbuild/bazel/issues/6565)

  - [--incompatible_provide_cc_toolchain_info_from_cc_toolchain_suite](https://github.com/bazelbuild/bazel/issues/6537)

  - [--incompatible_disable_depset_in_cc_user_flags](https://github.com/bazelbuild/bazel/issues/6383)

  - [--incompatible_disallow_data_transition](https://github.com/bazelbuild/bazel/issues/6153)

  - [--incompatible_package_name_is_a_function](https://github.com/bazelbuild/bazel/issues/5827)

  - [--incompatible_disallow_slash_operator](https://github.com/bazelbuild/bazel/issues/5823)

  - [--incompatible_static_name_resolution](https://github.com/bazelbuild/bazel/issues/5637)

 

Incompatible changes:

 

  - the --experimental_no_dotd_scanning_with_modules command line

    argument is not supported anymore.

  - The --prune_cpp_modules command line option is not supported

    anymore.

  - the --experimental_prune_cpp_input_discovery command line option

    is not supported anymore.

 

New features:

 

  - Added support for Android NDK r18.

 

Important changes:

 

  - The 'default' parameter of attr.output and attr.output_list is

    removed. This is controlled by

    --incompatible_no_output_attr_default

  - A number of platform-related Starlark APIs which were previously

    marked "experimental" are now disabled by default, and may be

    enabled via --experimental_platforms_api

  - Make legacy-test-support ("legacy_test-<api-level>") from

    android_sdk_repository neverlink. The legacy test support

    libraries shouldn't be built into test binaries. To make them

    available at runtime, developers should declare them via

    uses-library:

    https://developer.android.com/training/testing/set-up-project#andr

    oid-test-base

  - query remote server Capabilities (per REAPI v2)

  - CppRules: All cc_toolchains depended on from

    cc_toolchain_suite.toolchains are now analyzed when not using

    platforms in order to select the right cc_toolchain.

  - removed obsolete --explicit_jre_deps flag.

  - Incompatible flag

    --incompatible_disable_legacy_cpp_toolchain_skylark_api was

    flipped.

  - Improve error messaging when unsupport proguard options are

    specified at the library level.

  - Incompatible flag

    --incompatible_disable_legacy_cpp_toolchain_skylark_api was

    flipped.

  - Incompatible flag

    --incompatible_disable_legacy_cpp_toolchain_skylark_api was

    flipped.

  - The --incompatible_disable_late_bound_option_defaults flag has

    been flipped (#6384)

  - Incompatible flag

    --incompatible_disable_legacy_flags_cc_toolchain_api was flipped

    (#6434)

  - Fixed issue where ctx.resolve_command created conflicting

    intermediate files when resolve_command was called multiple times

    within the same rule invocation with a long command attribute.

  - Incompatible flag

    --incompatible_disable_cc_configuration_make_variables was

    flipped (#6381)

  - If the --javabase flag is unset, it Bazel locates a JDK using

    the JAVA_HOME environment variable and searching the PATH. If no

    JDK is found --javabase will be empty, and builds targeting Java

    will not

    be supported. Previously Bazel would fall back to using the

    embedded

    JDK as a --javabase, but this is no longer default behaviour. A

    JDK should

    be explicitly installed instead to enable Java development

  - Bazel will now shut down when idle for 5 minutes and the system

    is low on RAM (linux only).

  - CROSSTOOL file is now read from the package of cc_toolchain, not

    from

    the package of cc_toolchain_suite. This is not expected to break

    anybody since

    cc_toolchain_suite and cc_toolchain are commonly in the same

    package.

  - All overrides of Starlark's ctx.new_file function are now

    deprecated.

      Try the `--incompatible_new_actions_api` flag to ensure your

    code is forward-compatible.

  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto

    was flipped.

  - Introduce --(no)shutdown_on_low_sys_mem startup flag to toggle

    idle low-memory shutdown, disabled by default.

  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto

    was flipped.

  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto

    was flipped.

  - CppRules: All cc_toolchains depended on from

    cc_toolchain_suite.toolchains are now analyzed when not using

    platforms in order to select the right cc_toolchain.

  - The function `attr.license` is deprecated and will be removed.

      It can be disabled now with `--incompatible_no_attr_license`.

  - `range()` function now returns a lazy value

    (`--incompatible_range_type` is now set by default).

  - The code coverage report now includes the actual paths to header

    files instead of the ugly,

    Bazel generated, virtual includes path.

  - `--incompatible_disallow_conflicting_providers` has been switched

    to true

  - Add new flag `--incompatible_disable_systool_from_configration` to

    disable loading the systool from CppConfiguration.

  - Add new flag `--incompatible_disable_sysroot_from_configuration`

    to

    disable loading the systool from CppConfiguration.

  - Sorting remote Platform properties for remote execution. May

    affect cache keys!

  - Use different server log files per Bazel server process; java.log

    is

    now a symlink to the latest log.

 

This release contains contributions from many people at Google, as well as a7g4, Alan, Asaf Flescher, Benjamin Peterson, Ed Schouten, George Gensure, George Kalpakas, Keith Smiley, Loo Rong Jie, Mark Zeren, Petros Eskinder, rachcatch , Robert Brown, Robert Gay, Salty Egg.

--

Google Germany GmbH

Erika-Mann-Straße 33, 80636 München, Germany

[lcid...@gmail.com]

On Monday, December 3, 2018 at 3:44:10 PM UTC+1, Dmitry Lomov wrote:
>   - If the --javabase flag is unset, it Bazel locates a JDK using
>     the JAVA_HOME environment variable and searching the PATH. If no
>     JDK is found --javabase will be empty, and builds targeting Java
>     will not
>     be supported. Previously Bazel would fall back to using the
>     embedded
>     JDK as a --javabase, but this is no longer default behaviour. A
>     JDK should
>     be explicitly installed instead to enable Java development

Haven't been following the discussion but wondering why it does not fallback to downloading a "recent" version of JDK, similar to what e.g. Go or Scala rules do.

[Laurent Le Brun]

+Tobias

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Laurent

[Tobias Werth]

+Irina Iancu +Liam Miller-Cushon 

There's some discussion about all the JDKs in https://groups.google.com/d/msg/bazel-sig-jvm/wA9f-B6Tl5w/_RkXFI31AgAJ

The summary for the particular change is here: https://github.com/bazelbuild/bazel/issues/6105

--

Tobias Werth

Software Engineer

twe...@google.com

Google Germany GmbH

Erika-Mann-Straße 33

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