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overte/BUILD_ANDROID.md
Stephen Birarda c844502b97 use Qt 5.3 for android build as well
2015-01-19 14:49:01 -08:00

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Please read the general build guide for information on dependencies required for all platforms. Only Android specific instructions are found in this file.

###Android Dependencies

You will need the following tools to build our Android targets.

You will also need to cross-compile the dependencies required for all platforms for Android, and help CMake find these compiled libraries on your machine.

####ANDROID_LIB_DIR

Since you won't be installing Android dependencies to system paths on your development machine, CMake will need a little help tracking down your Android dependencies.

This is most easily accomplished by installing all Android dependencies in the same folder. You can place this folder wherever you like on your machine. In this build guide and across our CMakeLists files this folder is referred to as ANDROID_LIB_DIR. You can set ANDROID_LIB_DIR in your environment or by passing when you run CMake.

####Qt

Install Qt 5.3 for Android for your host environment from the Qt downloads page. Install Qt to $ANDROID_LIB_DIR/Qt. This is required so that our root CMakeLists file can help CMake find your Android Qt installation.

If you would like to install Qt to a different location, or attempt to build with a different Qt version, you can pass ANDROID_QT_CMAKE_PREFIX_PATH to CMake. Point to the cmake folder inside $VERSION_NUMBER/android_armv7/lib. Otherwise, our root CMakeLists will set it to $ANDROID_LIB_DIR/Qt/5.3/android_armv7/lib/cmake.

####OpenSSL

Cross-compilation of OpenSSL has only been tested from an OS X machine running 10.10 compiling OpenSSL 1.0.1j. It is likely that the steps below will work for other OpenSSL versions than 1.0.1j.

The full instructions to compile OpenSSL for Android from your host environment can be found here.

Download the OpenSSL source and extract the tarball inside your ANDROID_LIB_DIR. Rename the extracted folder to openssl.

You will need the setenv-android.sh script from the OpenSSL wiki.

First, make sure ANDROID_NDK_ROOT is set in your env. This should be the path to the root of your Android NDK install. If you've configured your machine to build the Android client using the instructions below, you can set it to the value of $ANDROID_NDK. setenv-android.sh needs ANDROID_NDK_ROOT to set the environment variables required for building OpenSSL.

Execute the setenv-android.sh script so it can set environment variables that OpenSSL will use while compiling.

Then, from the OpenSSL directory, run the following commands.

perl -pi -e 's/install: all install_docs install_sw/install: install_docs install_sw/g' Makefile.org 
./config shared -no-ssl2 -no-ssl3 -no-comp -no-hw -no-engine --openssldir=/usr/local/ssl/$ANDROID_API 
make depend
make all

This should generate libcrypto and libssl in the root of the OpenSSL directory.

If you have been building other components it is possible that the OpenSSL compile will fail based on the values other cross-compilations (tbb, bullet) have set. Ensure that you are in a new terminal window to avoid compilation errors from previously set environment variables.

####Intel Threading Building Blocks

Download the Intel Threading Building Blocks source and extract the tarball inside your ANDROID_LIB_DIR. Rename the extracted folder to tbb.

From the tbb directory, execute the following commands. This will set the compiler and archive tool to the correct ones from the NDK install and then build TBB using ndk-build. Then, the compiled libs are copied to a lib folder in the root of tbb directory.

Note that you will need to replace the value of $HOST below with whatever is appropriate for your host OS. On OS X, for example, the full exported value for CC is $ANDROID_NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc.

export CC=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/$HOST/bin/arm-linux-androideabi-gcc
export AR=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/$HOST/bin/arm-linux-androideabi-ar
cd jni
ndk-build target=android tbb tbbmalloc arch=arm
cd ../
mkdir lib
cp -rf build/linux_arm_*/**/*.so lib/

####GLM

Since GLM is a header only library, assuming it is installed at a system path or a path where our FindGLM module will find it you do not need to do anything specific for the Android build.

###CMake

We use CMake to generate the makefiles that compile and deploy the Android APKs to your device. In order to create Makefiles for the Android targets, CMake requires that some environment variables are set, and that other variables are passed to it when it is run.

The following must be set in your environment:

  • ANDROID_NDK - the root of your Android NDK install
  • ANDROID_HOME - the root of your Android SDK install
  • ANDROID_LIB_DIR - the directory containing cross-compiled versions of dependencies

The following must be passed to CMake when it is run:

  • CMAKE_TOOLCHAIN_FILE - full path to the android.toolchain.cmake file that is included in this repository (/cmake/android/android.toolchain.cmake)
  • ANDROID_NATIVE_API_LEVEL - the API level you want to use (this should be 19 for GearVR)