tree cb7b36d5f432800171e4c5a326e2887b93863bf2
parent ed0f7d07821c9ee01882f54d6d75be110435034d
author Jingwen Chen <jingwen@google.com> 1563396199 -0700
committer Copybara-Service <copybara-worker@google.com> 1563396284 -0700

Integrate Android NDK with toolchains

Fixes https://github.com/bazelbuild/bazel/issues/8871

Generates toolchains for the `cc_toolchain` targets in the `@androidndk` BUILD file:

```python
toolchain(
  name = "x86-clang8.0.7-libcpp_toolchain",
  toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
  target_compatible_with = [
      "@bazel_tools//platforms:android",
      "@bazel_tools//platforms:x86_32"
  ],
  toolchain = "@androidndk//:x86-clang8.0.7-libcpp",
)
toolchain(
  name = "x86_64-clang8.0.7-libcpp_toolchain",
  toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
  target_compatible_with = [
      "@bazel_tools//platforms:android",
      "@bazel_tools//platforms:x86_64"
  ],
  toolchain = "@androidndk//:x86_64-clang8.0.7-libcpp",
)
toolchain(
  name = "arm-linux-androideabi-clang8.0.7-v7a-libcpp_toolchain",
  toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
  target_compatible_with = [
      "@bazel_tools//platforms:android",
      "@bazel_tools//platforms:arm"
  ],
  toolchain = "@androidndk//:arm-linux-androideabi-clang8.0.7-v7a-libcpp",
)
toolchain(
  name = "aarch64-linux-android-clang8.0.7-libcpp_toolchain",
  toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
  target_compatible_with = [
      "@bazel_tools//platforms:android",
      "@bazel_tools//platforms:aarch64"
  ],
  toolchain = "@androidndk//:aarch64-linux-android-clang8.0.7-libcpp",
)
```

Users can use them by using the `--extra_toolchains=@androidndk//:all` flag or by registering them in the WORKSPACE with `register_toolchains("androidndk//:all")`.

RELNOTES: The Android NDK is now integrated with toolchains. To use them, pass the `--extra_toolchains=@androidndk//:all` flag or register them in your WORKSPACE with `register_toolchains("@androidndk//:all")`.

Closes #8918.

Change-Id: Iba708d1749efacbd47fc3584efd55634c70d2b18
PiperOrigin-RevId: 258633109