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An example of configuring a compiler.

This gives an example of how to setup a cross-compiler for embedded development. It is using the cross compiler from the Android NDK, but other GCC flavors should be similar.

This is not an example of how build android NDK apps.

Instructions

The following instructions assume Linux 64-bit machine.

  • Download the Android NDK from https://developer.android.com/tools/sdk/ndk/index.html

  • Unpack it into $HOME/tmp/android such that $HOME/tmp/android/android-ndk contains README.txt

  • Put BUILD and CROSSTOOL into $HOME/tmp/android/android-ndk

  • Put BUILD.sysroot into $HOME/tmp/android/android-ndk/platforms/android-19/arch-arm/BUILD (don't forget to rename it.)

  • Now create a separate workspace with a BUILD for a cc_binary

  • Run

bazel build --dynamic_mode=off \
    --package_path=%workspace%:$HOME/tmp/android:$HOME/bazel-src \
    --crosstool_top=//android-ndk:toolchain \
    --host_crosstool_top=//tools/cpp:toolchain \
    --cpu=armeabi-v7a \
    --custom_malloc=//android-ndk:malloc \
    //my/cc:binary
  • To deploy and test the resulting to your Android phone, using
adb bazel-bin/my/cc/binary data/local/tmp/my-binary
adb shell ./data/local/tmp/my-binary

For Darwin, the steps will be similar, but all paths referring to "linux-x86" should the equivalent darwin-x86 path instead.