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Implementation of mixed language project compilation via Bazel platform.

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yicm/BazelMixedLanguage

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[toc]

  • Support to build cpp application or library with bazel platform
  • Support to build golang application or library with bazel platform
  • Support to build android jni library with bazel platform(generate jni header automatically, end-to-end)
  • Support to build android application(non-platform)

2 Environment

  • WSL,Ubuntu18.04
  • Bazel 3.3+
  • Android JNI Library
    • Local JDK 8+(just for usingjavah orjavac to generate native headers)
      • sudo apt install openjdk-8-jdk-headless
    • Android sdkmanager (https://developer.android.com/studio#command-tools)
      • config the environment ofsdkmanager
      • sdkmanager --sdk_root=$HOME/Android --list
      • sdkmanager --sdk_root=$HOME/Android 'build-tools;29.0.2'
      • sdkmanager --sdk_root=$HOME/Android 'platforms;android-28'
      • sdkmanager --sdk_root=$HOME/Android --install "ndk;18.1.5063045"
$ sudo apt-get install gcc$ sudo apt-get install g++$ sudo apt-get install gcc-arm-linux-gnueabihf$ sudo apt-get install g++-arm-linux-gnueabihf

3 Non-Platform

3.1 Enable

  1. Open.bazelrc file:
build   --toolchain_resolution_debug# --------------------------# Way1: enable/disable --crosstool_top,--cpu# --------------------------build:compiler_config --crosstool_top=//toolchains/cpp:compiler_suitebuild:compiler_config --cpu=ubuntu_gccbuild:compiler_config --host_crosstool_top=@bazel_tools//tools/cpp:toolchain# --------------------------# Way2: enable/diable platform# --------------------------#build   --incompatible_enable_cc_toolchain_resolution
  1. Opentoolchains/cpp/BUILD, and commentgenerate_toolchains function, and uncommentgenerate_toolchain_suite function.

3.2 Default Build(cpu=k8)

To build this example you can use:

$ bazel build //cpp:hello-world

This compilation will only use the default compiler of the local machine.

3.3 Cross Build

  • step1: config your toolchains path:toolchain/cpp/supported.bzl
  • step2: build
# Default compilation configuration, --cpu : ubuntu_gcc$ bazel build --config=compiler_config //cpp:hello-world# Specify the toolchain to compile the target$ bazel build --config=compiler_config --cpu=ubuntu_arm_linux_gnueabihf //cpp:hello-world

4 Platform & Mixed Language

  • cpp
  • golang

4.1 Enable

  1. Open.bazelrc file:
build   --toolchain_resolution_debug# --------------------------# Way1: enable/disable --crosstool_top,--cpu# --------------------------#build:compiler_config --crosstool_top=//toolchains/cpp:compiler_suite#build:compiler_config --cpu=ubuntu_gcc#build:compiler_config --host_crosstool_top=@bazel_tools//tools/cpp:toolchain# --------------------------# Way2: enable/diable platform# --------------------------build   --incompatible_enable_cc_toolchain_resolution
  1. Opentoolchains/cpp/BUILD, and commentgenerate_toolchain_suite function, and uncommentgenerate_toolchains function.

4.2 Query

# to view all supported platforms$ bazel cquery"//platforms:all"# to view all android_sdk targets generated by android_sdk_repository$ bazel query"kind(android_sdk, @androidsdk//...)"

4.3 Build

4.3.1 C/C++

# p_ubuntu_gcc$ bazel build cpp:hello-world --platforms=//platforms:p_ubuntu_gcc# p_ubuntu_arm_linux_gnueabihf$ bazel build cpp:hello-world --platforms=//platforms:p_ubuntu_arm_linux_gnueabihf

4.3.2 Golang

$ bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64 golang/cmd/hello$ bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_arm //golang/cmd/hello

4.3.3 All

# build all targets$ bazel build --platforms=//platforms:p_ubuntu_gcc //...

4.3.4 Remote caching

# Remote caching$ bazel clean$ bazel build --remote_cache=grpc://10.151.176.11:8980 cpp:hello-world --platforms=//platforms:p_ubuntu_arm_linux_gnueabihf

4.3.5 JNI library

# Only Build Android JNI Library$ bazel build --platforms=//platforms:p_android_armv7a android:gen_jni_header$ bazel build --platforms=//platforms:p_android_armv7a android:jni_lib_shared$ bazel build --platforms=//platforms:p_android_aarch64 android:jni_lib_shared

4.3.6 Android APK

# Build and Install Android Application(including jni/java library)# First, you need to turn off the bazel platform feature in .bazelrc# archs: armeabi-v7a/arm64-v8/x86# way1$ bazel build android/demo/app/src/main:app --fat_apk_cpu=arm64-v8a# way2$ bazel build android/demo/app/src/main:app --config=android_arm64-v8a# Install apk# Maybe you'll have this problem: https://github.com/bazelbuild/examples/issues/120# way1$ bazel mobile-install android/demo/app/src/main:app# way2$ adb install bazel-bin/android/demo/app/src/main/app.apk
# view APK package information$ zipinfo -l app.apk# view application stack information$ adb shell dumpsys meminfo net.xiaobaiai.app

5 Platform Configuration

All toolchain information is in filetoolchains/cpp/supported.bzl.

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