OLA on Android

These are my notes from trying to get OLA working on Android. This work was done on a Mac, but it should be the same on Linux with a few minor tweaks.

Toolchain

Download the Android NDK. Extract, this assumes you extracted to $HOME/android-ndk-XXX.

The NDK comes with a script to build a stand alone toolchain. We need to run it.

cd android-ndk-XXX
./build/tools/make-standalone-toolchain.sh --system=darwin-x86_64 --platform=android-9 --install-dir=$HOME/android-toolchain/api9

Setup

We'll do all the work in $HOME/android

mkdir $HOME/android
# where we install libs to
mkdir $HOME/android/root

Setup env variables. Make sure you adjust the first line to use the version you downloaded.

export ANDROID_NDK_PATH=$HOME/android-ndk-XXX
export ANDROID_PLATFORM=9
export ANDROID_NDK_STANDALONE_TOOLCHAIN=~/android-toolchain/api$ANDROID_PLATFORM
export CPPFLAGS=""
export LDFLAGS=""
export PATH=$ANDROID_NDK_PATH/android-sdk-linux_x86/tools:$ANDROID_NDK_PATH/android-sdk-linux_x86/platform-tools:$ANDROID_NDK_STANDALONE_TOOLCHAIN/bin:$PATH

Test it out:

ls $ANDROID_NDK_PATH
ls $ANDROID_NDK_STANDALONE_TOOLCHAIN

Protobuf

You need to have protoc installed on your system first. To find out the correct path, run:

which protoc

Then pass this path in the --with-protoc argument below.

Note: if you get an error like Invalid configuration `arm-linux-androideabi': system `androideabi' not recognized when running ./configure, you need to get new versions of config.sub and config.guess and replace the ones in each package. The latest can be downloaded from http://git.savannah.gnu.org/gitweb/?p=config.git;a=tree

cd $HOME/android
wget <protobuf>
tar -zxf <protobuf>
cd protobuf-X.Y.Z
# fetch config.sub and config.guess if needed
./configure   --target=arm-linux-androideabi-gcc  --with-protoc=/opt/local/bin/protoc
make
DESTDIR="$HOME/android/root" make install

TODO: Figure out how to package (or should we statically link to ola?)

UUID

OSSP UUID is quite old (2008) now so it doesn't cross compile well. Instead we'll use the libuuid from e2fsprogs.

Download from http://e2fsprogs.sourceforge.net/

cd $HOME/android
wget <e2fsprogs-url>
tar -zxf <e2fsprogs>
cd e2fsprogs-X.Y.Z
./configure   --target=arm-linux-androideabi   
# we only want the libuuid bit
cd lib/uuid
make
DESTDIR="$HOME/android make install

Dependency Check

By this point you should have protobuf and uuid installed into ~/android/root. Check this is so:

$ ls ~/android/root/usr/local/include/
google uuid

OLA

export ac_cv_func_malloc_0_nonnull=yes
export PKG_CONFIG_PATH="$HOME/android/root/usr/local/lib/pkgconfig"
./configure --host=arm-linux-androideabi --build=i686-pc-linux-gnu CC=arm-linux-androideabi-gcc CXX=arm-linux-androideabi-c++ --disable-http --disable-unittests
make