This repository contains Starlark rules for integrating Bazel with the Android NDK. These rules currently work with Android NDK version 25b.
NOTE: This is a development preview of the Starlark Android NDK Bazel
rules. These rules are not guaranteed to be complete or work for every
NDK use case. Bazel versions up to and including 7.0.0 contain a
built-in ("native") version of android_ndk_repository described at
https://bazel.build/reference/be/android#android_ndk_repository. Over
time, these Starlark rules will replace the native version of
android_ndk_repository.
To use the Android NDK rules, add the following to your WORKSPACE file:
# Or a later commit
RULES_ANDROID_NDK_COMMIT= "81ec8b79dc50ee97e336a25724fdbb28e33b8d41"
RULES_ANDROID_NDK_SHA = "b29409496439cdcdb50a8e161c4953ca78a548e16d3ee729a1b5cd719ffdacbf"
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
http_archive(
name = "rules_android_ndk",
url = "https://github.com/bazelbuild/rules_android_ndk/archive/%s.zip" % RULES_ANDROID_NDK_COMMIT,
sha256 = RULES_ANDROID_NDK_SHA,
strip_prefix = "rules_android_ndk-%s" % RULES_ANDROID_NDK_COMMIT,
)
load("@rules_android_ndk//:rules.bzl", "android_ndk_repository")
android_ndk_repository(name = "androidndk")
register_toolchains("@androidndk//:all")
Then, set the ANDROID_NDK_HOME environment variable or the path attribute of
android_ndk_repository to the path of the local Android NDK installation
directory. If the path starts with $WORKSPACE_ROOT, then this string is
replaced with the root path of the Bazel workspace.
The api_level attribute can also be used to set the Android API level to build
against.
Finally, when building an Android app with native dependencies (e.g.
cc_library targets), add
--fat_apk_cpu=<cpus> --android_crosstool_top=@androidndk//:toolchain
to your Bazel invocation. <cpus> is a comma-separated list of the available
CPUs:
armeabi-v7a
arm64-v8a
x86
x86_64
e.g. --fat_apk_cpu=arm64-v8a or --fat_apk_cpu=arm64-v8a,x86.
These flags may also be added to the your project's .bazelrc file so that they
don't have to be specified on the command line.
See the example in https://github.com/bazelbuild/rules_android_ndk/tree/main/examples/basic.