Add Android support

12 files changed, 281 insertions, 9 deletions

diff --git a/contrib/depends/Makefile b/contrib/depends/Makefile
index ec0e4cfae..7eedee15e 100644
--- a/contrib/depends/Makefile
+++ b/contrib/depends/Makefile
@@ -53,7 +53,10 @@ endif
 host_arch=$(firstword $(subst -, ,$(canonical_host)))
 host_vendor=$(word 2,$(subst -, ,$(canonical_host)))
 full_host_os:=$(subst $(host_arch)-$(host_vendor)-,,$(canonical_host))
+host_os:=$(findstring android,$(full_host_os))
+ifeq ($(host_os),)
 host_os:=$(findstring linux,$(full_host_os))
+endif
 host_os+=$(findstring darwin,$(full_host_os))
 host_os+=$(findstring mingw32,$(full_host_os))
 host_os:=$(strip $(host_os))
@@ -74,6 +77,9 @@ endif
 ifeq ($(host_os),darwin)
 host_cmake=Darwin
 endif
+ifeq ($(host_os),android)
+host_cmake=Android
+endif
 
 AT_$(V):=
 AT_:=@
diff --git a/contrib/depends/hosts/android.mk b/contrib/depends/hosts/android.mk
new file mode 100644
index 000000000..2a24435d4
--- /dev/null
+++ b/contrib/depends/hosts/android.mk
@@ -0,0 +1,20 @@
+ANDROID_API=21
+
+ifeq ($(host_arch),arm)
+host_toolchain=arm-linux-androideabi-
+endif
+
+android_CC=$(host_toolchain)clang
+android_CXX=$(host_toolchain)clang++
+
+android_CFLAGS=-pipe
+android_CXXFLAGS=$(android_CFLAGS)
+
+android_release_CFLAGS=-O2
+android_release_CXXFLAGS=$(android_release_CFLAGS)
+
+android_debug_CFLAGS=-g -O0
+android_debug_CXXFLAGS=$(android_debug_CFLAGS)
+
+android_native_toolchain=android_ndk
+
diff --git a/contrib/depends/packages/android_ndk.mk b/contrib/depends/packages/android_ndk.mk
new file mode 100644
index 000000000..9b8a5332f
--- /dev/null
+++ b/contrib/depends/packages/android_ndk.mk
@@ -0,0 +1,22 @@
+package=android_ndk
+$(package)_version=17b
+$(package)_download_path=https://dl.google.com/android/repository/
+$(package)_file_name=android-ndk-r$($(package)_version)-linux-x86_64.zip
+$(package)_sha256_hash=5dfbbdc2d3ba859fed90d0e978af87c71a91a5be1f6e1c40ba697503d48ccecd
+
+define $(package)_set_vars
+$(package)_config_opts_arm=--arch arm
+$(package)_config_opts_aarch64=--arch arm64
+endef
+
+define $(package)_extract_cmds
+  echo $($(package)_sha256_hash) $($(1)_source_dir)/$($(package)_file_name) | sha256sum -c &&\
+  unzip -q $($(1)_source_dir)/$($(package)_file_name)
+endef
+
+define $(package)_stage_cmds
+  android-ndk-r$($(package)_version)/build/tools/make_standalone_toolchain.py --api 21 \
+    --install-dir $(build_prefix) --stl=libc++ $($(package)_config_opts) &&\
+  mv $(build_prefix) $($(package)_staging_dir)/$(host_prefix)
+endef
+
diff --git a/contrib/depends/packages/boost.mk b/contrib/depends/packages/boost.mk
index e60a1c677..3231df925 100644
--- a/contrib/depends/packages/boost.mk
+++ b/contrib/depends/packages/boost.mk
@@ -3,6 +3,7 @@ $(package)_version=1_64_0
 $(package)_download_path=https://dl.bintray.com/boostorg/release/1.64.0/source/
 $(package)_file_name=$(package)_$($(package)_version).tar.bz2
 $(package)_sha256_hash=7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332
+$(package)_dependencies=libiconv
 
 define $(package)_set_vars
 $(package)_config_opts_release=variant=release
@@ -10,6 +11,7 @@ $(package)_config_opts_debug=variant=debug
 $(package)_config_opts=--layout=tagged --build-type=complete --user-config=user-config.jam
 $(package)_config_opts+=threading=multi link=static -sNO_BZIP2=1 -sNO_ZLIB=1
 $(package)_config_opts_linux=threadapi=pthread runtime-link=shared
+$(package)_config_opts_android=threadapi=pthread runtime-link=static target-os=android
 $(package)_config_opts_darwin=--toolset=darwin-4.2.1 runtime-link=shared
 $(package)_config_opts_mingw32=binary-format=pe target-os=windows threadapi=win32 runtime-link=static
 $(package)_config_opts_x86_64_mingw32=address-model=64
diff --git a/contrib/depends/packages/openssl.mk b/contrib/depends/packages/openssl.mk
index 8d08900f5..f3b781f28 100644
--- a/contrib/depends/packages/openssl.mk
+++ b/contrib/depends/packages/openssl.mk
@@ -40,6 +40,8 @@ $(package)_config_opts_x86_64_linux=linux-x86_64
 $(package)_config_opts_i686_linux=linux-generic32
 $(package)_config_opts_arm_linux=linux-generic32
 $(package)_config_opts_aarch64_linux=linux-generic64
+$(package)_config_opts_arm_android=--static android-armv7 no-asm
+$(package)_config_opts_aarch64_android=--static android no-asm
 $(package)_config_opts_riscv64_linux=linux-generic64
 $(package)_config_opts_mipsel_linux=linux-generic32
 $(package)_config_opts_mips_linux=linux-generic32
@@ -51,7 +53,8 @@ endef
 
 define $(package)_preprocess_cmds
   sed -i.old "/define DATE/d" util/mkbuildinf.pl && \
-  sed -i.old "s|engines apps test|engines|" Makefile.org
+  sed -i.old "s|engines apps test|engines|" Makefile.org && \
+  sed -i -e "s/-mandroid //" Configure
 endef
 
 define $(package)_config_cmds
diff --git a/contrib/depends/packages/packages.mk b/contrib/depends/packages/packages.mk
index f4b9c6407..2d8030448 100644
--- a/contrib/depends/packages/packages.mk
+++ b/contrib/depends/packages/packages.mk
@@ -1,6 +1,14 @@
-packages:=boost openssl zeromq cppzmq expat ldns libiconv hidapi protobuf libusb
+ifeq ($(host_os),android)
+packages:=boost openssl zeromq libiconv
+else
+packages:=boost openssl zeromq lexpat dns libiconv hidapi protobuf libusb
+endif
+
 native_packages := native_ccache native_protobuf
 
+android_native_packages = android_ndk
+android_packages = ncurses readline sodium
+
 darwin_native_packages = native_biplist native_ds_store native_mac_alias
 darwin_packages = sodium-darwin ncurses readline 
 
diff --git a/contrib/depends/packages/sodium.mk b/contrib/depends/packages/sodium.mk
index b71f4383e..cdc690e69 100644
--- a/contrib/depends/packages/sodium.mk
+++ b/contrib/depends/packages/sodium.mk
@@ -8,6 +8,7 @@ $(package)_patches=fix-whitespace.patch
 define $(package)_set_vars
 $(package)_config_opts=--enable-static --disable-shared
 $(package)_config_opts+=--prefix=$(host_prefix)
+$(package)_config_opts_android=RANLIB=$($(package)_ranlib) AR=$($(package)_ar) CC=$($(package)_cc)
 endef
 
 define $(package)_config_cmds
diff --git a/contrib/depends/packages/zeromq.mk b/contrib/depends/packages/zeromq.mk
index c3a405a60..46caf14cb 100644
--- a/contrib/depends/packages/zeromq.mk
+++ b/contrib/depends/packages/zeromq.mk
@@ -3,7 +3,7 @@ $(package)_version=4.1.7
 $(package)_download_path=https://github.com/zeromq/zeromq4-1/releases/download/v$($(package)_version)/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_sha256_hash=31c383cfcd3be1dc8a66e448c403029e793687e70473b89c4cc0bd626e7da299
-$(package)_patches=9114d3957725acd34aa8b8d011585812f3369411.patch 9e6745c12e0b100cd38acecc16ce7db02905e27c.patch
+$(package)_patches=9114d3957725acd34aa8b8d011585812f3369411.patch 9e6745c12e0b100cd38acecc16ce7db02905e27c.patch ffe62d3398d5e0191f554f61049aa7ec9fc892ae.patch
 
 define $(package)_set_vars
   $(package)_config_opts=--without-documentation --disable-shared --without-libsodium --disable-curve
@@ -14,6 +14,7 @@ endef
 define $(package)_preprocess_cmds
   patch -p1 < $($(package)_patch_dir)/9114d3957725acd34aa8b8d011585812f3369411.patch && \
   patch -p1 < $($(package)_patch_dir)/9e6745c12e0b100cd38acecc16ce7db02905e27c.patch && \
+  patch -p1 < $($(package)_patch_dir)/ffe62d3398d5e0191f554f61049aa7ec9fc892ae.patch && \
   ./autogen.sh
 endef
 
diff --git a/contrib/depends/patches/zeromq/ffe62d3398d5e0191f554f61049aa7ec9fc892ae.patch b/contrib/depends/patches/zeromq/ffe62d3398d5e0191f554f61049aa7ec9fc892ae.patch
new file mode 100644
index 000000000..a532df1b6
--- /dev/null
+++ b/contrib/depends/patches/zeromq/ffe62d3398d5e0191f554f61049aa7ec9fc892ae.patch
@@ -0,0 +1,38 @@
+From ffe62d3398d5e0191f554f61049aa7ec9fc892ae Mon Sep 17 00:00:00 2001
+From: Gregory Lemercier <greglemercier@free.fr>
+Date: Sun, 7 Oct 2018 18:06:54 +0200
+Subject: [PATCH] Fix build on arm64 architectures with some strict compilers
+
+This patch fixes an issue that occurs on 64-bit architetures under
+strict compiler rules. The code initially checked that the received
+size stored in 'uint64_t' was not bigger than the max value of a
+'size_t' variable, which is legitimate on 32-bit architectures where
+'size_t' variables are stored on 32 bits. On 64-bit architectures,
+this test no longer makes sense since 'uint64_t' and 'size_t' types
+have the same size. The issue is fixed by ignoring this portion
+of code when built for arm64.
+---
+ src/v1_decoder.cpp | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/v1_decoder.cpp b/src/v1_decoder.cpp
+index b002dc9d..2c8c97a7 100644
+--- a/src/v1_decoder.cpp
++++ b/src/v1_decoder.cpp
+@@ -114,11 +114,13 @@ int zmq::v1_decoder_t::eight_byte_size_ready ()
+         return -1;
+     }
+ 
++#ifndef __aarch64__
+     //  Message size must fit within range of size_t data type.
+     if (payload_length - 1 > std::numeric_limits <size_t>::max ()) {
+         errno = EMSGSIZE;
+         return -1;
+     }
++#endif
+ 
+     const size_t msg_size = static_cast <size_t> (payload_length - 1);
+ 
+-- 
+2.20.1
+
diff --git a/contrib/depends/toolchain.cmake.in b/contrib/depends/toolchain.cmake.in
index ebe96b69c..0728515e3 100644
--- a/contrib/depends/toolchain.cmake.in
+++ b/contrib/depends/toolchain.cmake.in
@@ -1,4 +1,4 @@
-# Set the system name, either Darwin, Linux, or Windows
+# Set the system name to one of Android, Darwin, Linux, or Windows
 SET(CMAKE_SYSTEM_NAME @depends@)
 SET(CMAKE_BUILD_TYPE @release_type@)
 
@@ -18,13 +18,14 @@ SET(CMAKE_FIND_ROOT_PATH @prefix@ /usr)
 
 SET(ENV{PKG_CONFIG_PATH} @prefix@/lib/pkgconfig)
 
-SET(LRELEASE_PATH @prefix@/native/bin CACHE FILEPATH "path to lrelease" FORCE)
-
 SET(Readline_ROOT_DIR @prefix@)
 SET(Readline_INCLUDE_DIR @prefix@/include)
 SET(Readline_LIBRARY @prefix@/lib/libreadline.a)
 SET(Termcap_LIBRARY @prefix@/lib/libtinfo.a)
 
+if(NOT CMAKE_SYSTEM_NAME STREQUAL "Android")
+SET(LRELEASE_PATH @prefix@/native/bin CACHE FILEPATH "path to lrelease" FORCE)
+
 SET(LIBUNWIND_INCLUDE_DIR @prefix@/include)
 SET(LIBUNWIND_LIBRARIES @prefix@/lib/libunwind.a)
 SET(LIBUNWIND_LIBRARY_DIRS @prefix@/lib)
@@ -37,6 +38,7 @@ SET(Protobuf_PROTOC_EXECUTABLE @prefix@/native/bin/protoc CACHE FILEPATH "Path t
 SET(Protobuf_INCLUDE_DIR @prefix@/include CACHE PATH "Protobuf include dir")
 SET(Protobuf_INCLUDE_DIRS @prefix@/include CACHE PATH "Protobuf include dir")
 SET(Protobuf_LIBRARY @prefix@/lib/libprotobuf.a CACHE FILEPATH "Protobuf library")
+endif()
 
 SET(ZMQ_INCLUDE_PATH @prefix@/include)
 SET(ZMQ_LIB @prefix@/lib/libzmq.a)
@@ -78,6 +80,22 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   SET(CMAKE_OSX_ARCHITECTURES "x86_64")
   SET(LLVM_ENABLE_PIC OFF)
   SET(LLVM_ENABLE_PIE OFF)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Android")
+  SET(ANDROID TRUE)
+  if(ARCHITECTURE STREQUAL "arm")
+    SET(CMAKE_ANDROID_ARCH_ABI "armeabi-v7a")
+    SET(CMAKE_SYSTEM_PROCESSOR "armv7-a")
+    SET(CMAKE_ANDROID_ARM_MODE ON)
+    SET(CMAKE_C_COMPILER_TARGET arm-linux-androideabi)
+    SET(CMAKE_CXX_COMPILER_TARGET arm-linux-androideabi)
+    SET(_CMAKE_TOOLCHAIN_PREFIX arm-linux-androideabi-)
+  elseif(ARCHITECTURE STREQUAL "aarch64")
+    SET(CMAKE_ANDROID_ARCH_ABI "arm64-v8a")
+    SET(CMAKE_SYSTEM_PROCESSOR "aarch64")
+  endif()
+  SET(CMAKE_ANDROID_STANDALONE_TOOLCHAIN @prefix@/native)
+  SET(CMAKE_C_COMPILER "${_CMAKE_TOOLCHAIN_PREFIX}clang")
+  SET(CMAKE_CXX_COMPILER "${_CMAKE_TOOLCHAIN_PREFIX}clang++")
 else()
   SET(CMAKE_C_COMPILER @CC@)
   SET(CMAKE_CXX_COMPILER @CXX@)
@@ -89,13 +107,21 @@ if(ARCHITECTURE STREQUAL "arm")
   set(ARM_ID "armv7-a")
   set(BUILD_64 OFF)
   set(CMAKE_BUILD_TYPE release)
-  set(BUILD_TAG "linux-armv7")
+  if(ANDROID)
+    set(BUILD_TAG "android-armv7")
+  else()
+    set(BUILD_TAG "linux-armv7")
+  endif()
   set(ARM7)
 elseif(ARCHITECTURE STREQUAL "aarch64")
   set(ARCH "armv8-a")
   set(ARM ON)
   set(ARM_ID "armv8-a")
-  set(BUILD_TAG "linux-armv8")
+  if(ANDROID)
+    set(BUILD_TAG "android-armv8")
+  else()
+    set(BUILD_TAG "linux-armv8")
+  endif()
   set(BUILD_64 ON)
 endif()
 
diff --git a/contrib/gitian/gitian-android.yml b/contrib/gitian/gitian-android.yml
new file mode 100644
index 000000000..0de588409
--- /dev/null
+++ b/contrib/gitian/gitian-android.yml
@@ -0,0 +1,135 @@
+---
+name: "monero-android-0.15"
+enable_cache: true
+suites:
+- "bionic"
+architectures:
+- "amd64"
+packages:
+- "curl"
+- "gperf"
+- "gcc-7"
+- "g++-7"
+- "gcc"
+- "g++"
+- "binutils-gold"
+- "git"
+- "pkg-config"
+- "build-essential"
+- "autoconf"
+- "libtool"
+- "automake"
+- "faketime"
+- "bsdmainutils"
+- "ca-certificates"
+- "python"
+- "cmake"
+- "ccache"
+- "protobuf-compiler"
+- "libdbus-1-dev"
+- "libharfbuzz-dev"
+- "libprotobuf-dev"
+- "python3-zmq"
+- "unzip"
+remotes:
+- "url": "https://github.com/monero-project/monero.git"
+  "dir": "monero"
+files: []
+script: |
+
+  WRAP_DIR=$HOME/wrapped
+  HOSTS="arm-linux-android aarch64-linux-android"
+  FAKETIME_HOST_PROGS="clang clang++ ar ranlib nm"
+  FAKETIME_PROGS="date"
+  HOST_CFLAGS="-O2 -g"
+  HOST_CXXFLAGS="-O2 -g"
+  HOST_LDFLAGS=-static-libstdc++
+
+  export GZIP="-9n"
+  export TAR_OPTIONS="--mtime="$REFERENCE_DATE\\\ $REFERENCE_TIME""
+  export TZ="UTC"
+  export BUILD_DIR=`pwd`
+  mkdir -p ${WRAP_DIR}
+  if test -n "$GBUILD_CACHE_ENABLED"; then
+    export SOURCES_PATH=${GBUILD_COMMON_CACHE}
+    export BASE_CACHE=${GBUILD_PACKAGE_CACHE}
+    mkdir -p ${BASE_CACHE} ${SOURCES_PATH}
+  fi
+
+  export ZERO_AR_DATE=1
+
+  function create_global_faketime_wrappers {
+  for prog in ${FAKETIME_PROGS}; do
+    echo '#!/usr/bin/env bash' > ${WRAP_DIR}/${prog}
+    echo "REAL=\`which -a ${prog} | grep -v ${WRAP_DIR}/${prog} | head -1\`" >> ${WRAP_DIR}/${prog}
+    echo 'export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/faketime/libfaketime.so.1' >> ${WRAP_DIR}/${prog}
+    echo "export FAKETIME=\"$1\"" >> ${WRAP_DIR}/${prog}
+    echo "\$REAL \$@" >> $WRAP_DIR/${prog}
+    chmod +x ${WRAP_DIR}/${prog}
+  done
+  }
+
+  function create_per-host_faketime_wrappers {
+  for i in $HOSTS; do
+    ABI=$i
+    if expr $i : arm- > /dev/null
+    then
+      ABI=$i"eabi"
+    fi
+    NDKDIR="${BUILD_DIR}/monero/contrib/depends/$i/native/bin"
+    for prog in ${FAKETIME_HOST_PROGS}; do
+        WRAPPER=${WRAP_DIR}/${ABI}-${prog}
+        echo '#!/usr/bin/env bash' > ${WRAPPER}
+        echo 'export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/faketime/libfaketime.so.1' >> ${WRAPPER}
+        echo "export FAKETIME=\"$1\"" >> ${WRAPPER}
+        echo "$NDKDIR/${ABI}-$prog \$@" >> ${WRAPPER}
+        chmod +x ${WRAPPER}
+    done
+  done
+  }
+
+  # Faketime for depends so intermediate results are comparable
+  DUMMYTIME="2000-01-01 12:00:00"
+  export PATH_orig=${PATH}
+  create_global_faketime_wrappers "$DUMMYTIME"
+  create_per-host_faketime_wrappers "$DUMMYTIME"
+  export PATH=${WRAP_DIR}:${PATH}
+
+  # gcc 7+ honors SOURCE_DATE_EPOCH, no faketime needed
+  export SOURCE_DATE_EPOCH=`date -d "$DUMMYTIME" +%s`
+
+  git config --global core.abbrev 9
+  cd monero
+  # Set the version string that gets added to the tar archive name
+  version="`git describe`"
+  if [[ $version == *"-"*"-"* ]]; then
+    version="`git rev-parse --short=9 HEAD`"
+    version="`echo $version | head -c 9`"
+  fi
+
+  BASEPREFIX=`pwd`/contrib/depends
+  # Build dependencies for each host
+  for i in $HOSTS; do
+    make ${MAKEOPTS} -C ${BASEPREFIX} HOST="${i}"
+  done
+
+  # Faketime for binaries
+  export PATH=${PATH_orig}
+  create_global_faketime_wrappers "${REFERENCE_DATETIME}"
+  create_per-host_faketime_wrappers "${REFERENCE_DATETIME}"
+  export PATH=${WRAP_DIR}:${PATH}
+
+  ORIGPATH="$PATH"
+  # Build in a new dir for each host
+  for i in ${HOSTS}; do
+    export PATH=${BASEPREFIX}/${i}/native/bin:${ORIGPATH}
+    mkdir build && cd build
+    cmake .. -DCMAKE_TOOLCHAIN_FILE=${BASEPREFIX}/${i}/share/toolchain.cmake -DCMAKE_BUILD_TYPE=Release
+    make ${MAKEOPTS}
+    DISTNAME=monero-${i}-${version}
+    mv bin ${DISTNAME}
+    find ${DISTNAME}/ | sort | tar --no-recursion --mode='u+rw,go+r-w,a+X' --owner=0 --group=0 -c -T - | bzip2 -9 > ${OUTDIR}/${DISTNAME}.tar.bz2
+    cd ..
+    rm -rf build
+  done
+
diff --git a/contrib/gitian/gitian-build.py b/contrib/gitian/gitian-build.py
index a8d164c2c..138a5ac4f 100755
--- a/contrib/gitian/gitian-build.py
+++ b/contrib/gitian/gitian-build.py
@@ -66,6 +66,12 @@ def build():
         subprocess.check_call(['bin/gsign', '-p', args.sign_prog, '--signer', args.signer, '--release', args.version+'-linux', '--destination', '../sigs/', 'inputs/monero/contrib/gitian/gitian-linux.yml'])
         subprocess.check_call('mv build/out/monero-*.tar.bz2 ../out/'+args.version, shell=True)
 
+    if args.android:
+        print('\nCompiling ' + args.version + ' Android')
+        subprocess.check_call(['bin/gbuild', '-j', args.jobs, '-m', args.memory, '--commit', 'monero='+args.commit, '--url', 'monero='+args.url, 'inputs/monero/contrib/gitian/gitian-android.yml'])
+        subprocess.check_call(['bin/gsign', '-p', args.sign_prog, '--signer', args.signer, '--release', args.version+'-android', '--destination', '../sigs/', 'inputs/monero/contrib/gitian/gitian-android.yml'])
+        subprocess.check_call('mv build/out/monero-*.tar.bz2 ../out/'+args.version, shell=True)
+
     if args.windows:
         print('\nCompiling ' + args.version + ' Windows')
         subprocess.check_call(['bin/gbuild', '-j', args.jobs, '-m', args.memory, '--commit', 'monero='+args.commit, '--url', 'monero='+args.url, 'inputs/monero/contrib/gitian/gitian-win.yml'])
@@ -84,6 +90,7 @@ def build():
         print('\nCommitting '+args.version+' Unsigned Sigs\n')
         os.chdir('sigs')
         subprocess.check_call(['git', 'add', args.version+'-linux/'+args.signer])
+        subprocess.check_call(['git', 'add', args.version+'-android/'+args.signer])
         subprocess.check_call(['git', 'add', args.version+'-win/'+args.signer])
         subprocess.check_call(['git', 'add', args.version+'-osx/'+args.signer])
         subprocess.check_call(['git', 'commit', '-m', 'Add '+args.version+' unsigned sigs for '+args.signer])
@@ -95,6 +102,8 @@ def verify():
 
     print('\nVerifying v'+args.version+' Linux\n')
     subprocess.check_call(['bin/gverify', '-v', '-d', '../sigs/', '-r', args.version+'-linux', 'inputs/monero/contrib/gitian/gitian-linux.yml'])
+    print('\nVerifying v'+args.version+' Android\n')
+    subprocess.check_call(['bin/gverify', '-v', '-d', '../sigs/', '-r', args.version+'-android', 'inputs/monero/contrib/gitian/gitian-android.yml'])
     print('\nVerifying v'+args.version+' Windows\n')
     subprocess.check_call(['bin/gverify', '-v', '-d', '../sigs/', '-r', args.version+'-win', 'inputs/monero/contrib/gitian/gitian-win.yml'])
     print('\nVerifying v'+args.version+' MacOS\n')
@@ -111,7 +120,7 @@ def main():
     parser.add_argument('-v', '--verify', action='store_true', dest='verify', help='Verify the Gitian build')
     parser.add_argument('-b', '--build', action='store_true', dest='build', help='Do a Gitian build')
     parser.add_argument('-B', '--buildsign', action='store_true', dest='buildsign', help='Build both signed and unsigned binaries')
-    parser.add_argument('-o', '--os', dest='os', default='lwm', help='Specify which Operating Systems the build is for. Default is %(default)s. l for Linux, w for Windows, m for MacOS')
+    parser.add_argument('-o', '--os', dest='os', default='lawm', help='Specify which Operating Systems the build is for. Default is %(default)s. l for Linux, a for Android, w for Windows, m for MacOS')
     parser.add_argument('-j', '--jobs', dest='jobs', default='2', help='Number of processes to use. Default %(default)s')
     parser.add_argument('-m', '--memory', dest='memory', default='2000', help='Memory to allocate in MiB. Default %(default)s')
     parser.add_argument('-k', '--kvm', action='store_true', dest='kvm', help='Use KVM instead of LXC')
@@ -127,6 +136,7 @@ def main():
     workdir = os.getcwd()
 
     args.linux = 'l' in args.os
+    args.android = 'a' in args.os
     args.windows = 'w' in args.os
     args.macos = 'm' in args.os