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BUILDING external libs

Based on https://forum.getmonero.org/5/support/87643/building-monero-v0-10-3-1-for-android and the internet.

Do not follow this blindly.

These instructions are tailored to building wallep_api.

These instructions build all supported architectures: 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'.

Yes, lots of copy&paste here. TODO: Script this.

Prepare Ubuntu environment

sudo apt-get install build-essential cmake tofrodos libtool-bin
sudo mkdir /opt/android
sudo chown $LOGNAME /opt/android

Install Android NDK

cd /opt/android
wget https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip
unzip android-ndk-r16b-linux-x86_64.zip
ln -s android-ndk-r16b ndk
ndk/build/tools/make_standalone_toolchain.py --api 21 --stl=libc++ --arch arm --install-dir /opt/android/tool/arm
ndk/build/tools/make_standalone_toolchain.py --api 21 --stl=libc++ --arch arm64 --install-dir /opt/android/tool/arm64
ndk/build/tools/make_standalone_toolchain.py --api 21 --stl=libc++ --arch x86 --install-dir /opt/android/tool/x86
ndk/build/tools/make_standalone_toolchain.py --api 21 --stl=libc++ --arch x86_64 --install-dir /opt/android/tool/x86_64

Prepare output

mkdir -p /opt/android/build

Build OpenSSL

Best is to compile openssl from sources. Copying from your phone or elsewhere (don't!) ends up in misery.

If you don't want to build for all architectures, edit build-all-arch.sh before running it (Line 12).

cd /opt/android
git clone https://github.com/m2049r/android-openssl.git
wget https://github.com/openssl/openssl/archive/OpenSSL_1_0_2l.tar.gz
cd android-openssl
tar xfz ../OpenSSL_1_0_2l.tar.gz
ANDROID_NDK_ROOT=/opt/android/ndk ./build-all-arch.sh

Install & make symlinks

mkdir -p /opt/android/build/openssl/{arm,arm64,x86,x86_64}
cp -a /opt/android/android-openssl/prebuilt/armeabi   /opt/android/build/openssl/arm/lib
cp -a /opt/android/android-openssl/prebuilt/arm64-v8a /opt/android/build/openssl/arm64/lib
cp -a /opt/android/android-openssl/prebuilt/x86       /opt/android/build/openssl/x86/lib
cp -a /opt/android/android-openssl/prebuilt/x86_64    /opt/android/build/openssl/x86_64/lib
cp -aL /opt/android/android-openssl/openssl-OpenSSL_1_0_2l/include/openssl/ /opt/android/build/openssl/include
ln -s /opt/android/build/openssl/include /opt/android/build/openssl/arm/include
ln -s /opt/android/build/openssl/include /opt/android/build/openssl/arm64/include
ln -s /opt/android/build/openssl/include /opt/android/build/openssl/x86/include
ln -s /opt/android/build/openssl/include /opt/android/build/openssl/x86_64/include

ln -sf /opt/android/build/openssl/include /opt/android/tool/arm/sysroot/usr/include/openssl
ln -sf /opt/android/build/openssl/lib/armeabi-v7a/*.so /opt/android/tool/arm/sysroot/usr/lib

ln -sf /opt/android/build/openssl/include /opt/android/tool/arm64/sysroot/usr/include/openssl
ln -sf /opt/android/build/openssl/lib/arm64-v8a/*.so /opt/android/tool/arm64/sysroot/usr/lib

ln -sf /opt/android/build/openssl/include /opt/android/tool/x86/sysroot/usr/include/openssl
ln -sf /opt/android/build/openssl/lib/x86/*.so /opt/android/tool/x86/sysroot/usr/lib

ln -sf /opt/android/build/openssl/include /opt/android/tool/x86_64/sysroot/usr/include/openssl
ln -sf /opt/android/build/openssl/lib/x86_64/*.so /opt/android/tool/x86_64/sysroot/usr/lib64

Build Boost

cd /opt/android
wget https://sourceforge.net/projects/boost/files/boost/1.58.0/boost_1_58_0.tar.gz/download -O boost_1_58_0.tar.gz
tar xfz boost_1_58_0.tar.gz
cd boost_1_58_0
./bootstrap.sh

Comment out using ::fgetpos; & using ::fsetpos; in cstdio.

Then build & install to /opt/android/build/boost with

PATH=/opt/android/tool/arm/arm-linux-androideabi/bin:/opt/android/tool/arm/bin:$PATH      ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --build-dir=android-arm    --prefix=/opt/android/build/boost/arm    --includedir=/opt/android/build/boost/include toolset=clang threading=multi threadapi=pthread target-os=android install
ln -sf ../include /opt/android/build/boost/arm
PATH=/opt/android/tool/arm64/aarch64-linux-android/bin:/opt/android/tool/arm64/bin:$PATH  ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --build-dir=android-arm64  --prefix=/opt/android/build/boost/arm64  --includedir=/opt/android/build/boost/include toolset=clang threading=multi threadapi=pthread target-os=android install
ln -sf ../include /opt/android/build/boost/arm64
PATH=/opt/android/tool/x86/i686-linux-android/bin:/opt/android/tool/x86/bin:$PATH         ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --build-dir=android-x86    --prefix=/opt/android/build/boost/x86    --includedir=/opt/android/build/boost/include toolset=clang threading=multi threadapi=pthread target-os=android install
ln -sf ../include /opt/android/build/boost/x86
PATH=/opt/android/tool/x86_64/x86_64-linux-android/bin:/opt/android/tool/x86_64/bin:$PATH ./b2 --build-type=minimal link=static runtime-link=static --with-chrono --with-date_time --with-filesystem --with-program_options --with-regex --with-serialization --with-system --with-thread --build-dir=android-x86_64 --prefix=/opt/android/build/boost/x86_64 --includedir=/opt/android/build/boost/include toolset=clang threading=multi threadapi=pthread target-os=android install
ln -sf ../include /opt/android/build/boost/x86_64

And finally: Build Monero

cd /opt/android
git clone https://github.com/m2049r/monero.git

cd /opt/android/monero/build
./build-all-arch.sh

Bringing it all together

Copy all .a libraries into the appropriate external-libs folders.
Copy /opt/android/monero/src/wallet/api/wallet2_api.h into external-libs/monero/include

If using default locations, this would mean:

cd <path-to-xmrwallet>/external-libs
# remove old stuff
find . -name "*.a" -or -name "*.h" -type f -delete
./collect.sh

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