Bazel SDK

The Bazel SDK frontend produces a Bazel workspace.

This Bazel SDK is not meant for public use!

This Bazel SDK is used to verify that the core Integrator's Developer Kit (IDK) is not biased towards any particular build system. However, this code is not actively maintained, so it may break when used with future versions of its dependencies.

If you are looking for an SDK to use, check out the GN SDK, or consider building your own using the IDK.

Directory structure

• generate.py: the script that generates the SDK;
• templates: Mako templates used to produce various SDK files;
• base: SDK contents that are copied verbatim;
• tests: various SDK tests, copied over to the test workspace.

Output layout

$root/
    tools/                                 # host tools
    dart/                                  # Dart packages
        lorem/
            BUILD
            lib/
    pkg/                                   # C++ package contents
        foo/
            BUILD                          # generated Bazel build file for this package
            include/                       # headers
            arch                           # target-independent prebuilts
                x64/
                    lib/
                        libfoo.so          # ABI only, to link against
                    dist/
                        libfoo.so          # to include in Fuchsia packages
                    debug/
                        libfoo.so          # unstripped version
                arm64/
                    lib/
                    dist/
                    debug/
            BUILD
        bar/
            include/
            src/                           # sources for a C++ library
            BUILD
    arch/
        x64/
            sysroot/                       # x64 sysroot (libc, libzircon, and friends)
        arm64/
            sysroot/                       # arm64 sysroot

Generating

In order to generate a Bazel workspace, point the generate.py script to an SDK archive, e.g.:

$ scripts/sdk/bazel/generate.py \
    --archive my_sdk_archive.tar.gz \
    --output my_workspace/

Testing

The generate.py script optionally creates a workspace for testing the generated SDK:

$ scripts/sdk/bazel/generate.py \
    --archive my_sdk_archive.tar.gz \
    --output my_workspace/ \
    --tests my_test_workspace/

Tests are then run with:

$ my_test_workspace/run.py

It is recommended to use the version of Bazel available in the Fuchsia source tree at //prebuilt/sdk/bazel to run the tests:

$ my_test_workspace/run.py --bazel $FUCHSIA_DIR/prebuilt/sdk/bazel/bazel

To exclude a target from the suite, mark it as ignored with:

my_rule(
    name = "foobar",
    ...
    tags = [
        "ignored",
    ],
)

To force-build ignored targets, use the --ignored flag.

The test runner also builds targets in the SDK itself. To bypass this step, use the --no-sdk flag.

Consuming

C++

The produced Bazel SDK can be consumed by adding those lines to a Bazel WORKSPACE:

http_archive(
  name = "fuchsia_sdk",
  path = "<FUCHSIA_SDK_URL>",
)

load("@fuchsia_sdk//build_defs:fuchsia_setup.bzl", "fuchsia_setup")
fuchsia_setup(with_toolchain = True)

This adds the Fuchsia SDK to the workspace and sets up the necessary toolchains for cross compilation.

To reference the toolchains, add this to the .bazelrc file:

build:fuchsia --crosstool_top=@fuchsia_crosstool//:toolchain
build:fuchsia --cpu=x86_64
build:fuchsia --host_crosstool_top=@bazel_tools//tools/cpp:toolchain

Targets can then be built for Fuchsia with:

$ bazel build --config=fuchsia //...

Dart & Flutter

To build Dart & Flutter packages using the Bazel SDK, add those lines to the Bazel WORKSPACE:

http_archive(
  name = "fuchsia_sdk",
  path = "<FUCHSIA_SDK_URL>",
)

load("@fuchsia_sdk//build_defs:fuchsia_setup.bzl", "fuchsia_setup")
fuchsia_setup(with_toolchain = False)

http_archive(
  name = "io_bazel_rules_dart",
  url = "https://github.com/dart-lang/rules_dart/archive/master.zip",
  strip_prefix = "rules_dart-master",
)

load("@io_bazel_rules_dart//dart/build_rules:repositories.bzl", "dart_repositories")
dart_repositories()

load("@fuchsia_sdk//build_defs:setup_dart.bzl", "setup_dart")
setup_dart()

load("@fuchsia_sdk//build_defs:setup_flutter.bzl", "setup_flutter")
setup_flutter()