Update AOT doc and CMakeLists.txt on Android (#3471)
The library needs to be linked statically, and `DyLIB` needs to be added
to `IREE_HAL_DRIVERS_TO_BUILD`.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9d5a461..d12969b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -95,8 +95,7 @@
set( IREE_HAL_DRIVERS_TO_BUILD ${IREE_ALL_HAL_DRIVERS} )
# For cross compilation towords Android, we don't want LLVM JIT HAL driver.
if(ANDROID)
- # TODO(ataei): Enable dylib/dylib-llvm-aot for android.
- list(REMOVE_ITEM IREE_HAL_DRIVERS_TO_BUILD LLVM DyLib)
+ list(REMOVE_ITEM IREE_HAL_DRIVERS_TO_BUILD LLVM)
endif()
# For Apple platforms we need to use Metal instead of Vulkan.
diff --git a/docs/get_started/getting_started_android_cmake.md b/docs/get_started/getting_started_android_cmake.md
index ba78b21..e740b27 100644
--- a/docs/get_started/getting_started_android_cmake.md
+++ b/docs/get_started/getting_started_android_cmake.md
@@ -263,16 +263,16 @@
### Dylib LLVM AOT backend
To compile IREE module for the target Android device (assume Android 10 AArc64)
-we need install the corresponding standalone toolchain and setting AOT linker
-path environment variable:
+we need to use the corresponding standalone toolchain (which can be found in
+ANDROID_NDK) and setting AOT linker path environment variable:
```shell
-$ export ANDROID_ARM64_TOOLCHAIN=/path/to/install/the/toolchain
-$ "${ANDROID_NDK?}/build/tools/make-standalone-toolchain.sh" --arch=arm64 --platform=android-29 \
- --install-dir="${ANDROID_ARM64_TOOLCHAIN?}"
-$ export IREE_LLVMAOT_LINKER_PATH="${ANDROID_ARM64_TOOLCHAIN?}/aarch64-linux-android/bin/ld"
+$ export IREE_LLVMAOT_LINKER_PATH="${ANDROID_NDK?}/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android29-clang++ -static-libstdc++ -O3"
```
+`-static-libstdc++` is needed because some dynamic libraries would not be able
+to open.
+
Translate a source MLIR into an IREE module:
```shell
