tree 96830dfb3235120cdc0b91487d8c6f0074b8c6ee
parent 889e744ec70b8caa5a82008c572e4e42d8b282a8
author Kojo Acquah <KoolJBlack@users.noreply.github.com> 1633478899 -0700
committer GitHub <noreply@github.com> 1633478899 -0700
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Implementation of the gradle-android Docker file and build_android_library github action. (#7143)

This implements a new Github action `.github/workflows/build_android_library.yml` that runs our workflow to build IREE's TFLite Java bindings via  `build_tools/gradle/build_tflite_android_library.sh`.

The Github Action uses a new `gradle-android/Docker` file to produce consistent repeatable builds locally and remote. 

On some systems, gradle fails to run the `externalNativeBuild` task with an unexplained NullPointer error. To get around this. We manually build the native IREE TFLite compatibility shim with [Android cross-compilation](https://google.github.io/iree/building-from-source/android/). The resulting library is copied into the `jniLibs` folder to be included directly in the final library, while native build tasks are skipped by gradle. 

Additional changes to fix recent issues with the gradle build: 
* Switching to the support Android library for  the `NonNull` annotation
* Encapsulating `mlir-tablegen` target with the `IREE_BUILD_COMPILER ` in `build_tools/cmake/iree_copts.cmake`. This caused build failure when compiling the host-tooling without compiler targets (avoid building all of LLVM) since tablegen targets can't compile without other compiler dependencies hidden behind this flag.