Enable Aspects to specify their configuration fragment dependencies.

Note: This specification currently does not have any effect, but soon...

In the default mode, when an aspect does not call any of the configuration
fragment methods on its AspectDefinition.Builder, the old behavior will
persist; aspects can only access fragments their associated rule has access
to, and have no guarantee as to what those fragments are.
This mode will become deprecated with a future CL.

If an aspect does call a configuration fragment method, it will have a
configuration fragment policy. In a future CL, this will mean it will be
restricted to accessing only those fragments, but will be understood as
requiring access to them for the purposes of dynamic configuration, even if
the rule it is attached to or created by does not otherwise require them.
Eventually, all aspects will be required to declare their configuration
fragments this way.

Skylark aspects may also declare configuration fragments as of this CL.
Two new parameters are added to the aspect() function, fragments and
host_fragments, mirroring the similar parameters for rules.
If both of these parameters are empty or unspecified, the default mode
is used, as with normal aspects.

Also in this CL:
* Minor javadoc fixes for AspectDefinition.
* Additional tests for AspectDefinition.

--
MOS_MIGRATED_REVID=112271713
5 files changed
tree: fea553f726bba8739dfa581281c684a2887229fc
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. compile.sh
  13. CONTRIBUTING.md
  14. CONTRIBUTORS
  15. LICENSE.txt
  16. README.md
  17. WORKSPACE
README.md

Bazel (Beta)

{Fast, Correct} - Choose two

Bazel is a build tool that builds code quickly and reliably. It is used to build the majority of Google‘s software, and thus it has been designed to handle build problems present in Google’s development environment, including:

  • A massive, shared code repository, in which all software is built from source. Bazel has been built for speed, using both caching and parallelism to achieve this. Bazel is critical to Google's ability to continue to scale its software development practices as the company grows.

  • An emphasis on automated testing and releases. Bazel has been built for correctness and reproducibility, meaning that a build performed on a continuous build machine or in a release pipeline will generate bitwise-identical outputs to those generated on a developer's machine.

  • Language and platform diversity. Bazel's architecture is general enough to support many different programming languages within Google, and can be used to build both client and server software targeting multiple architectures from the same underlying codebase.

Find more background about Bazel in our FAQ.

Getting Started

About the Bazel project: