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# BUILDING external libs | ||
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Based on https://forum.getmonero.org/5/support/87643/building-monero-v0-10-3-1-for-android and the internet. | ||
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Do not follow this blindly. These instructions are for 32-bit only. 64-bit building mostly involves | ||
replacing "32" with "64". | ||
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## Prepare Ubuntu environment | ||
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``` | ||
sudo apt-install build-essential cmake tofrodos | ||
sudo mkdir /opt/android | ||
sudo chown $LOGNAME /opt/android | ||
``` | ||
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## Install Android NDK | ||
``` | ||
cd /opt/android | ||
wget https://dl.google.com/android/repository/android-ndk-r15c-linux-x86_64.zip | ||
unzip android-ndk-r15c-linux-x86_64.zip | ||
android-ndk-r15c/build/tools/make_standalone_toolchain.py --api 21 --stl=libc++ --arch arm --install-dir /opt/android/tool32 | ||
``` | ||
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## Build OpenSSL | ||
Best is to compile openssl from sources. Copying from your phone or elsewhere (don't!) ends up in misery. | ||
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### Setup environment | ||
``` | ||
cd /opt/android | ||
wget https://wiki.openssl.org/images/7/70/Setenv-android.sh | ||
fromdos Setenv-android.sh | ||
``` | ||
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Edit Setenv-android.sh: | ||
``` | ||
_ANDROID_EABI="arm-linux-androideabi-4.9" | ||
_ANDROID_API="android-21" | ||
``` | ||
Then: | ||
``` | ||
export ANDROID_NDK_ROOT=/opt/android/android-ndk-r15c | ||
. ./Setenv-android.sh | ||
``` | ||
and ignore error about FIPS_SIG. | ||
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### Download and build OpenSSL | ||
``` | ||
wget https://github.com/openssl/openssl/archive/OpenSSL_1_0_2l.tar.gz | ||
tar xfz OpenSSL_1_0_2l.tar.gz | ||
cd openssl-OpenSSL_1_0_2l/ | ||
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=/opt/android/openssl/android-21/ | ||
make depend | ||
# Make sure we don't get versioned .so which Android can't deal with | ||
make CALC_VERSIONS="SHLIB_COMPAT=; SHLIB_SOVER=" MAKE="make -e" all | ||
mkdir -p /opt/android/openssl/android-21/lib | ||
echo "place-holder make target for avoiding symlinks" >> /opt/android/openssl/android-21/lib/link-shared | ||
make SHLIB_EXT=.so install_sw | ||
``` | ||
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### Make symlinks | ||
``` | ||
cd /opt/android/tool32/sysroot/usr/include | ||
ln -s ../../../../openssl/android-21/include/openssl | ||
cd /opt/android/tool32/sysroot/usr/lib | ||
ln -s ../../../../openssl/android-21/lib/libssl.so | ||
ln -s ../../../../openssl/android-21/lib/libcrypto.so | ||
``` | ||
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## Build Boost | ||
``` | ||
cd /opt/android | ||
https://sourceforge.net/projects/boost/files/boost/1.64.0/boost_1_64_0.tar.gz/download -O boost_1_64_0.tar.gz | ||
tar xfz boost_1_64_0.tar.gz | ||
(cd boost_1_64_0; ./bootstrap.sh) | ||
``` | ||
The NDK r15c above gives errors about fsetpos and fgetpos not found(!?!), so we "just" comment them out in the include file: | ||
`nano /opt/android/tool32/include/c++/4.9.x/cstdio` (`//using ::fgetpos`, `//using ::fsetpos`) | ||
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Then: | ||
``` | ||
export PATH=/opt/android/tool32/arm-linux-androideabi/bin:/opt/android/tool32/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=android32 --stagedir=android32 toolset=clang threading=multi threadapi=pthread target-os=android stage | ||
``` | ||
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## And finally: Build Monero | ||
``` | ||
cd /opt/android | ||
git clone https://github.com/monero-project/monero | ||
cd monero | ||
# <patch monero code as needed> | ||
mkdir -p build/release.android32 | ||
cd build/release.android32 | ||
# only if not set already set | ||
export PATH=/opt/android/tool32/arm-linux-androideabi/bin:/opt/android/tool32/bin:$PATH | ||
CC=clang CXX=clang++ cmake -D BUILD_TESTS=OFF -D ARCH="armv7-a" -D STATIC=ON -D BUILD_64=OFF -D CMAKE_BUILD_TYPE=release -D ANDROID=true -D BUILD_TAG="android" -D BOOST_ROOT=/opt/android/boost_1_64_0 -D BOOST_LIBRARYDIR=/opt/android/boost_1_64_0/android32/lib -D OPENSSL_ROOT_DIR=/opt/android/openssl/android-21 -D CMAKE_POSITION_INDEPENDENT_CODE:BOOL=true ../.. | ||
make | ||
find . -name '*.a' -exec cp '{}' lib \; | ||
``` | ||
Ignore the warning from the last command - all static libraries are now in `lib`. | ||
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# Bringing it all together | ||
- Copy all .a libraries into the appropriate `external-libs` folders. | ||
- Copy `/opt/android/monero/src/wallet/wallet2_api.h` into `external-libs/monero/include` |