Doc building for android

These are preliminary build instructions for Android. Note that ARM and Android integration are still very early and incomplete. This information is for hackers that want to work on the ARM port.

1. setup android ndk standalone tool chain with platform=14 option

   Android NDK can be downloaded from http://developer.android.com/tools/sdk/ndk/index.html

   example command to setup standalone tool chain:

   ~/work/toolchains/android-ndk-r8c/build/tools$ ./make-standalone-toolchain.sh --platform=android-14 --install-dir=/home/ubuntu/work/toolchains/ndk_standalone --ndk-dir=/home/ubuntu/work/toolchains/android-ndk-r8c
   

2. Download rustc from git repository

   a. git clone https://github.com/webconv/rust.git

   b. cd rust

   c. mkdir build

   d. cd build

3. Create Makefile using CMake

   cmake ../ -DTargetOsType=android -DTargetCpuType=arm -DToolchain=path_of_standalone_toolchain_dir

4. Build libuv and llvm

   make libuv

   make llvm

5. Create Makefile again (the Makefile made in step 3 does not contain information of llvm)

   cmake ../

6. Build Rustc ( make and make install have been separated)

   a.make

   b.make install [ it will copy ARM libraries into /usr/local/lib/rustc/arm-unknown-android/lib

7. How to cross compiler

   rustc --target arm-unknown-android hello.rs

8. How to run on Android

   use adb -e push command to push all arm libs as specified in 6 b

   push your binary

   set LD_LIBRARY_PATH

   run using adb shell