| Android NDK x86-64 instruction set support |
| === |
| |
| Introduction: |
| ------------- |
| |
| Android NDK r[TBD] added support for the '`x86-64`' ABI, that allows native code to |
| run on Android-based devices running on CPUs supporting the x86-64 instruction |
| set. |
| |
| The Android x86-64 ABI itself is fully specified in docs/CPU-ARCH-ABIS.html. |
| |
| Overview: |
| --------- |
| |
| Generating machine code is simple: just add 'x86-64' to your APP_ABI |
| definition in your Application.mk file, for example: |
| |
| APP_ABI := armeabi armeabi-v7a x86 x86-64 |
| |
| Alternatively, you can use: |
| |
| APP_ABI := all |
| |
| will generate machine code for all supported ABIs with this NDK. Doing so |
| will ensure that your application package contains libraries for all target |
| ABIs. Note that this has an impact on package size, since each ABI will |
| correspond to its own set of native libraries built from the same sources. |
| |
| The default ABI is still '`armeabi`', if unspecified in your project. |
| |
| As you would expect, generated libraries will go into `$PROJECT/libs/x86-64/`, |
| and will be embedded into your .apk under `/lib/x86-64/`. |
| |
| And just like other ABIs, the Android package manager will extract these |
| libraries on a *compatible* x86-64 based device automatically at install |
| time, to put them under <dataPath>/lib, where <dataPath> is the |
| application's private data directory. |
| |
| Similarly, the Google Play server is capable of filtering applications |
| based on the native libraries they embed and your device's target CPU. |
| |
| Debugging with ndk-gdb should work exactly as described under docs/NDK-GDB.html. |
| |
| Standalone-toolchain: |
| --------------------- |
| |
| It is possible to use the x86-64 toolchain with NDK in stand-alone mode. |
| See docs/STANDALONE-TOOLCHAIN.html for more details. Briefly speaking, |
| it is now possible to run: |
| |
| $NDK/build/tools/make-standalone-toolchain.sh --arch=x86_64 --install-dir=<path> |
| |
| The toolchain binaries have the `x86_64-linux-android- prefix`. |
| |
| |
| Compatibility: |
| -------------- |
| |
| The minimal native API level provided by official Android x86-64 platform |
| builds is [TBD], which corresponds to all the native APIs provided by |
| Android [TBD], i.e. [TBD]-desert. |
| |
| You won't have to change anything to your project files if you target an older |
| API level: the NDK build script will automatically select the right set of |
| native platform headers/libraries for you. |
