Difference between revisions of "Compiling ScummVM/Android"

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Update instructions - use the Dockerized buildbot toolchains
(Update instructions - use the Dockerized buildbot toolchains)
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This page describes how to build Android packages from the ScummVM source tree.
This page describes how to build Android packages from the ScummVM source tree.
While one can manually go through the process of installing and configuring the toolchains for the target Android architectures, and cross-compiling any third party libraries (again for each target architecture), currently the recommended method is to use a Docker container that can be built using scripts from our [https://github.com/scummvm/dockerized-bb Dockerised Buildbot repository]. This page will cover how to build ScummVM for the supported target Android architecture using the Docker container method.


{| border="0" cellpadding="1" cellspacing="2" style="margin-left:5em; background:#FF9999; width:80%"
However, one can still attempt the manual way of setting up the Android toolchain(s), without using Docker containers, by following the logic and commands in our scripts for building the Docker images.  
|- align="center"
| '''NOTE'''
|- style="margin-left:1em; background:#ffffff;"
|- style="background:#ffffff"
| Please note that information on this page may be outdated; The Optional Libraries  section in particular needs updating.  
|}


= Mandatory tools =
= Preparatory work =


Android SDK Manager from Android Studio or from Command line tools - https://developer.android.com/studio
== On a Linux 64bit distribution ==


Use the SDK Manager to install:
You will to run a recent Linux 64bit distribution, eg. Ubuntu 16.04 LTS or higher (or equivalent). These instructions were tested on a host running Ubuntu x64 20.04 LTS.
* Platform tools
* Build Tools 29.0.
* SDK Platform API 29
* NDK 21.3.6528147 (r21d)


Set the <tt>ANDROID_SDK_ROOT</tt> environment variable to the root directory of the SDK, and <tt>ANDROID_NDK_ROOT</tt> to the root directory of the NDK - default installation: <tt>${ANDROID_SDK_ROOT}/ndk/21.3.6528147</tt>
Install the <tt>git</tt> package in order to clone the ScummVM source code repository and keep it up-to-date, and also some additional packages to build the Docker toolchain containers:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install git m4 make


= Optional libraries =
Follow the instructions on the [https://docs.docker.com/engine/install/ubuntu/ official Docker documentation page to install the Docker Engine on Linux]. We tested with Docker Engine Community Edition 19.03.12, (build 48a66213fe) using containerd.io version 1.2.13 on Linux Ubuntu x64 20.04 LTS.
* [http://svn.xiph.org/branches/lowmem-branch/Tremor/ Tremor] (lowmem branch) to play ''.ogg'' audio files
* [http://www.underbit.com/products/mad/ MAD] to play ''.mp3'' audio files
* [http://flac.sourceforge.net/ FLAC] to play lossless ''.flac'' files


Again, you have two options:
== On Windows 10 (version 1904 or higher) using WSL2 ==


== Precompiled binaries ==
Please, follow the instructions on the [https://docs.docker.com/docker-for-windows/wsl/ official Docker documentation page to install the Docker Engine on Windows 10 using WSL2]. This process requires rebooting your PC at least a couple of times. The instructions also link to appropriate documentation on how to enable WSL on Windows and install a Linux distribution from the Windows Store. These instructions were tested with the Ubuntu 20.04 LTS app installed.


Get [http://sourceforge.net/projects/scummvm/files/build/3rd-android-4.tar.bz2/download this archive] and extract it to e.g. <tt>/opt/android</tt>.
After enabling WSL2, and running Docker Desktop (with WSL integration), launch a bash shell for your installed Linux distribution by running the respective Windows app (here, Ubuntu 20.04 LTS). You can launch multiple bash shells by running the Linux distribution app multiple times.  


== Build the libraries yourself ==
From the Linux bash shell do:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install git m4 make


Warning: this sections is not yet updated for new Android toolchain
*Important note: The instructions below assume that you are running the commands from a Linux bash shell. If you're on Windows, please make sure you 'always have Docker Desktop up and running' before launching your Linux bash shell(s).


Here's a a simple script to set up a shell for crosscompiling for <tt>arm-v7a</tt>:
= Setting up the environment =
In this step we will fetch the latest code from the ScummVM source code repository, and create a few additional folders and files that will help in the building process and/or improve its ease of use (eg. by maintaining the history of submitted commands).


  #!/bin/sh
From your Linux host shell do:
   
  mkdir -p ~/Workspace
PREFIX=${ANDROID_NDK}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-
  mkdir -p ~/Workspace/android-scummvm-bb/bshomes
  export CC=${PREFIX}gcc
  touch ~/Workspace/android-scummvm-bb/.bash_history
export CXX=${PREFIX}g++
  sudo chmod o+rw ~/Workspace/android-scummvm-bb/.bash_history
export AS=${PREFIX}gcc
export LD=${PREFIX}gcc
export AR=${PREFIX}ar cru
export RANLIB=${PREFIX}ranlib
export STRIP=${PREFIX}strip
export OBJCOPY=${PREFIX}objcopy
export CPP=${PREFIX}cpp
export MACHDEP="--sysroot=$ANDROID_NDK/platforms/android-4/arch-arm -g -mandroid -mthumb-interwork"
   
export CFLAGS="${MACHDEP} -Os -Wall -mandroid -msoft-float -march=armv5te -mtune=xscale"
export CXXFLAGS="${CFLAGS}"
export CPPFLAGS="${CFLAGS}"
export LDFLAGS="${MACHDEP}"
echo "./configure --host=arm --prefix=/opt/android/3rd-android-4-armeabi"


Save it to a file (like <tt>android-4-eabi.sh</tt>) and run
Now clone the ScummVM repository:
cd ~/Workspace
git clone https://github.com/scummvm/scummvm.git


  . ./android-4-eabi.sh
Also clone the ScummVM dockerized buildbot repository and build the Docker containers:
  git clone https://github.com/scummvm/dockerized-bb.git ~/Workspace/android-scummvm-bb/dockerized-bb
cd ~/Workspace/android-scummvm-bb/dockerized-bb
make toolchains/android


in your shell. Build systems should now use the correct tools.
At this point the 'docker images' command should return something like the following:
docker images
REPOSITORY                  TAG      IMAGE ID      CREATED            SIZE
toolchains/android          latest    2005faedc472  22 minutes ago      3.9GB
toolchains/android-common  latest    c726cca9065b  About an hour ago  30kB
toolchains/common          latest    c751ec410582  About an hour ago  24.7kB


=== Tremor ===
*Important note: From time to time, you may need get updates from our Dockerized buildbot code (using git pull) and rebuild the toolchain containers, in order to make use of the latest improvements and any additional third party cross-compiled libraries.


Get a SVN checkout (r17852. as of this writing):
= Launch the Docker container =


  svn co http://svn.xiph.org/trunk/Tremor
Now launch the Docker container shell:
  docker run -v ~/Workspace/scummvm:/data/scummvm \
-v ~/android-scummvm-bb/bshomes:/data/bshomes/android \
-v ~/android-scummvm-bb/.bash_history:/root/.bash_history \
-w /data/scummvm \
-it toolchains/android \
/bin/bash


configure it:
= Compiling =
 
./autogen.sh --host=arm --prefix=/opt/android/3rd-android-4-armeabi --enable-low-accuracy --enable-64kHz-limit
 
and finally build & install it:


  make
== Set the environment variables ==
  make install
First, make sure that the required environment variables are set with the correct values:
  export RO_ANDROID_ROOT=/opt/android \
ANDROID_EXTERNAL_ROOT=/data/bshomes/android \
  HOST_TAG=linux-x86_64


=== MAD ===
Then run:
export ANDROID_NDK_ROOT=${RO_ANDROID_ROOT}/ndk \
ANDROID_TOOLCHAIN=${RO_ANDROID_ROOT}/ndk/toolchains/llvm/prebuilt/linux-x86_64 \
ANDROID_SDK_ROOT=${ANDROID_EXTERNAL_ROOT}/sdk \
ANDROID_SDK_HOME=${ANDROID_EXTERNAL_ROOT}/sdk-home \
GRADLE_USER_HOME=${ANDROID_EXTERNAL_ROOT}/gradle \
ANDROID_SDK_BTOOLS_VERSION=29.0.3


Get a tarball of the latest stable version [http://sourceforge.net/projects/mad/files/libmad/ here] (v0.15.1b as of this writing) and extract it.
*Important note: The above command reflects the SDK build tools version installed by the container at the time of writing. This version string may need updating if the container is updated to set up a more recent version of the SDK build tools.  


configure it:
Additionally, run:
export ANDROID_SDK_TOOLS=${ANDROID_SDK_ROOT}/tools \
ANDROID_SDK_BTOOLS=${ANDROID_SDK_ROOT}/build-tools/${ANDROID_SDK_BTOOLS_VERSION} \
PATH=${ANDROID_SDK_TOOLS}:${ANDROID_SDK_BTOOLS}:${PATH} \
NDK_LOG=1 \
LC_ALL=C \
CCACHE_COMPRESS=1


  ./autogen.sh --host=arm --prefix=/opt/android/3rd-android-4-armeabi --enable-speed --enable-fpm=arm --disable-aso
Also, after setting up these variables, run the following command:
  mkdir -p "${ANDROID_SDK_ROOT}" "${ANDROID_SDK_HOME}" "${GRADLE_USER_HOME}"
cp -R "${RO_ANDROID_ROOT}"/sdk/licenses "${ANDROID_SDK_ROOT}"/licenses


and finally build & install it:
*Important note: The above command is only required to be run once, since it sets up some required folders and copies required SDK licenses to the external mounted folders (on the host Linux, outside the container itself)


  make
== Configuring and Compiling ScummVM ==
  make install
From your Linux host (ie. not from within the Container shell):
You should probably first make sure you are working with the latest ScummVM code. Please, run:
  cd ~/Workspace/scummvm
  git pull


=== FLAC ===
'''TODO''' The following instructions build for the 'android-arm64-v8a' architecture. A slightly different configure command is required for the other target architectures


Get a tarball of the latest stable version [http://flac.sourceforge.net/download.html here] (v1.2.1 as of this writing) and extract it.
From the Docker container shell:
* For a debug build, run the following series of commands from inside the local scummvm repository folder (you should be in there by default after running the 'docker run' command):
rm -rf android_project
rm -rf debug
rm -rf release
CXX="ccache ${ANDROID_TOOLCHAIN}/bin/aarch64-linux-android21-clang++" PKG_CONFIG_LIBDIR="${ANDROID_TOOLCHAIN}/sysroot/usr/lib/aarch64-linux-android/21/pkgconfig" PATH=${PATH}:"${ANDROID_TOOLCHAIN}/sysroot/usr/bin/aarch64-linux-android/21" make clean; ./configure --enable-verbose-build --enable-all-engines --host=android-arm64-v8a  --enable-debug
make -j$(nproc) androiddistdebug


configure it:
A debug build will be signed automatically by a debug certificate. This certificate will be created by default inside a '.android' subfolder of your ANDROID_SDK_HOME path, which for us is the host path: <tt>~/Workspace/android-scummvm-bb/.android/</tt>. The debug keystore is named appropriately 'debug.keystore'. For instructions on how to create a debug signing certificate manually, please refer to the [https://developer.android.com/studio/publish/app-signing#debugmode Android Developers instructions here]


  ./configure --prefix=/opt/android/3rd-android-4-armeabi --disable-largefile --disable-thorough-tests --disable-doxygen-docs --disable-xmms-plugin --disable-cpplibs --disable-ogg --disable-oggtest --disable-rpath
* For a release build, run the following series of commands from inside the local scummvm repository folder (you should be in there by default after running the 'docker run' command):
  rm -rf android_project
rm -rf debug
rm -rf release
CXX="ccache ${ANDROID_TOOLCHAIN}/bin/aarch64-linux-android21-clang++" PKG_CONFIG_LIBDIR="${ANDROID_TOOLCHAIN}/sysroot/usr/lib/aarch64-linux-android/21/pkgconfig" PATH=${PATH}:"${ANDROID_TOOLCHAIN}/sysroot/usr/bin/aarch64-linux-android/21" make clean; ./configure --enable-verbose-build --enable-all-engines --host=android-arm64-v8a  --disable-debug --enable-release
make -j$(nproc) androiddistrelease


and build & install the required parts:
Please note that a release build must be signed with a non-debug key in order to be installed on a Android device.


make -C src/libFLAC
Supported target architectures for the configure command:
make -C src/libFLAC install
make -C include install
 
= Compiling =
 
The Android port can be compiled with the <tt>configure</tt> script.
 
The most basic way to accomplish this is to run:
 
./configure --host=android-arm-v7a
make
 
The script supports various arguments, which you can use to en- or disable features, see <tt>./configure --help</tt>.
 
If you want support for additional libraries, you need cross-compiled binaries.
If you followed the [[#Optional libraries|above description]] and have those libraries in <tt>/opt/android/3rd-android-4-armeabi</tt>, the <tt>configure</tt> command line would look like this:
 
./configure --host=android-arm-v7a --with-tremor-prefix=/opt/android/3rd-android-4-armeabi --with-mad-prefix=/opt/android/3rd-android-4-armeabi --with-flac-prefix=/opt/android/3rd-android-4-armeabi
 
Supported hosts:
* <tt>android-arm-v7a</tt> - for older Android devices
* <tt>android-arm-v7a</tt> - for older Android devices
* <tt>android-arm64-v8a</tt> - for all new Android devices
* <tt>android-arm64-v8a</tt> - for all new Android devices
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After compiling there in the build directory (if used) there will be a new directory called <tt>android-project</tt>, this can be opened by Android Studio. C files are not yet available, but it is possible to edit the Java source files and debug both Java & native code (in emulator or on a real device via <tt>adb</tt> connection).
After compiling there in the build directory (if used) there will be a new directory called <tt>android-project</tt>, this can be opened by Android Studio. C files are not yet available, but it is possible to edit the Java source files and debug both Java & native code (in emulator or on a real device via <tt>adb</tt> connection).
To enable debugging, after opening the <tt>android-project</tt> directory change <tt>Project configuration</tt>, under tab <tt>Debugger</tt>, set field <tt>Debug type</tt> to <tt>Dual</tt>
To enable debugging, after opening the <tt>android-project</tt> directory change <tt>Project configuration</tt>, under tab <tt>Debugger</tt>, set field <tt>Debug type</tt> to <tt>Dual</tt>
= References  =
* [[Compiling_ScummVM/Docker#Using_the_docker_images | Using the Docker images]]
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