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Cross Compilation for Android on Linux

Through cross compilation, on Linux it is possible to build CoreCLR for arm64 Android.

Requirements

You'll need to generate a toolchain and a sysroot for Android. There's a script which takes care of the required steps.

Generating the rootfs

To generate the rootfs, run the following command in the coreclr folder:

cross/init-android-rootfs.sh

This will download the NDK and any packages required to compile Android on your system. It's over 1 GB of data, so it may take a while.

Cross compiling CoreCLR

Once the rootfs has been generated, it will be possible to cross compile CoreCLR.

When cross compiling, you need to set both the CONFIG_DIR and ROOTFS_DIR variables.

To compile for arm64, run:

CONFIG_DIR=`realpath cross/android/arm64` ROOTFS_DIR=`realpath cross/android-rootfs/toolchain/arm64/sysroot` ./build.sh cross arm64 cmakeargs -DENABLE_LLDBPLUGIN=0

The resulting binaries will be found in artifacts/bin/coreclr/Linux.BuildArch.BuildType/

Running the PAL tests on Android

You can run the PAL tests on an Android device. To run the tests, you first copy the PAL tests to your Android phone using adb, and then run them in an interactive Android shell using adb shell:

To copy the PAL tests over to an Android phone:

adb push artifacts/obj/coreclr/Linux.arm64.Debug/src/pal/tests/palsuite/ /data/local/tmp/coreclr/pal/tests/palsuite
adb push cross/android/toolchain/arm64/sysroot/usr/lib/libandroid-support.so /data/local/tmp/coreclr/lib/
adb push cross/android/toolchain/arm64/sysroot/usr/lib/libandroid-glob.so /data/local/tmp/coreclr/lib/
adb push src/pal/tests/palsuite/paltestlist.txt /data/local/tmp/coreclr
adb push src/pal/tests/palsuite/runpaltests.sh /data/local/tmp/coreclr/

Then, use adb shell to launch a shell on Android. Inside that shell, you can launch the PAL tests:

LD_LIBRARY_PATH=/data/local/tmp/coreclr/lib ./runpaltests.sh /data/local/tmp/coreclr/

Debugging coreclr on Android

You can debug coreclr on Android using a remote lldb server which you run on your Android device.

First, push the lldb server to Android:

adb push cross/android/lldb/2.2/android/arm64-v8a/lldb-server /data/local/tmp/

Then, launch the lldb server on the Android device. Open a shell using adb shell and run:

adb shell
cd /data/local/tmp
./lldb-server platform --listen *:1234

After that, you'll need to forward port 1234 from your Android device to your PC:

adb forward tcp:1234 tcp:1234

Finally, install lldb on your PC and connect to the debug server running on your Android device:

lldb-3.9
(lldb) platform select remote-android
  Platform: remote-android
 Connected: no
(lldb) platform connect connect://localhost:1234
  Platform: remote-android
    Triple: aarch64-*-linux-android
OS Version: 23.0.0 (3.10.84-perf-gf38969a)
    Kernel: #1 SMP PREEMPT Fri Sep 16 11:29:29 2016
  Hostname: localhost
 Connected: yes
WorkingDir: /data/local/tmp

(lldb) target create coreclr/pal/tests/palsuite/file_io/CopyFileA/test4/paltest_copyfilea_test4
(lldb) env LD_LIBRARY_PATH=/data/local/tmp/coreclr/lib
(lldb) run