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Add support for Android versions 5-11.
**Configuration**
We provide the following arguments to configure the Android version:
- `ANDROID_NDK`
- `ANDROID_SDK` (note that this is dependent on `ANDROID_VERSION)
- `ANDROID_VERSION`
- `ANDROID_SYSTEM_COMPLETE`: do a complete Android build
- `ANDROID_SYSTEM_NONE`: do not build the Android system, disables runner support
**Version Support**
We now support NDK versions r10e-r25b, SDK versions 21-33, and Android versions 5.0, 5.1, 6.0, 7.0, 8.0, 8.1, 9.0, 10.0, and 11.0. We also validate that the NDK, SDK, and Android versions are compatible.
For Android 12+, we do support using the NDK with the proper API level, allowing cross-compilation for the desired target, however, running or testing the generated binary is currently not supported without a complete build. Note that support for non-complete builds with Android versions 12+ is unlikely to ever occur, due to issues with APEX in the build system.
**Implementation Details**
Next, we've improved the removal of unittests during the build process, to ensure fast builds while maintaining compatibility with various newer Android versions. To do this, we've implemented a Python library and a script. The Python library contains a complete parser (correctly parses all valid input) for Soong blueprint files, using an LALR grammar, and a rudimentary parser for Makefiles.
The Soong parser removes any `gtest` dependencies, as well as any subdirectories or scope names containing `test`. For example:
```go
cc_library {
name: "lib",
srcs: ["lib.cc",],
}
cc_test {
name: "test",
defaults: ["target"],
srcs: ["test.cc"],
}
```
Will become:
```go
cc_library {
name: "lib",
srcs: ["lib.cc",],
}
```
The Makefile parser first splits the file based on conditional directives (`ifeq`, `endif`, etc.) to ensure any subsequent processing doesn't lead to unbalanced directives. Next, we split the text within each directive based on comment sections used in the Android source tree. For example:
```Makefile
test_tags := tests
include $(call subdir,$(LOCAL_PATH))
c_flags := \
-g \
-Wall
```
We can therefore remove the `Benchmarks` and `Unit tests` sections without removing the `Other section`.
The Python library is reasonably performant (it adds no noticeable overhead to the build process) and is compact (in total, < 60KB). Also, it is much more resilient than a series of `sed` scripts.
Finally, extensive unittests have been added for the Python library, for both code linting (`flake8`) and unittests (via `tox`). Since we cannot assume the presence of Python on the host machine, the tests can be optionally enabled via the `--python` flag (or `PYTHON` environment variable, to hook into the git hooks), and custom overrides for the `flake8` and `tox` commands are provided (since the user may wish to specify a specific Python version, such as `python3.7 -m flake8`).
**Linker**
For Android 10+, since we use a minimal Android build, we only support the bootstrap and ASAN linkers unless using a complete Android build. Supporting the APEX linker requires a nearly complete Android runtime, requiring 60+GB image sizes, slow builds, and other prohibitive factors.
**Complete Builds**
Complete builds are currently untested, for Androids version 12+ they exceed the default storage capacity of WSL2 images (250GB). They should work and properly install both the `/system` and `/apex` directories, however, the builds are slow and untested.- Loading branch information
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,4 @@ | ||
| { | ||
| "description": "support different Android NDK, API, and Android versions using Docker build args.", | ||
| "type": "added" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,11 @@ | ||
| # don't copy any of the python artifacts to the docker context | ||
| __pycache__/ | ||
| .pytest_cache/ | ||
| *.py[cod] | ||
| *$py.class | ||
| **/*.egg-info/ | ||
| *.egg | ||
| .tox | ||
|
|
||
| # also skip our test suite | ||
| android/tests/ |
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