Merge pull request #6077

240dbb124 gitian: add --rebuild option (Howard Chu) 643860776 Add Android support (Howard Chu)
5 years ago · f6201081fa
parent c751388835 240dbb1243
commit f6201081fa
13 changed files with 329 additions and 21 deletions
--- 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_$(V):=
 AT_:=@
--- a/contrib/depends/hosts/android.mk
+++ b/contrib/depends/hosts/android.mk
@ -0,0 +1,20 @@
+ANDROID_API=21
+
+ifeq ($(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=$(android_debug_CFLAGS)
+
+android_native_toolchain=android_ndk
+
--- a/contrib/depends/packages/android_ndk.mk
+++ b/contrib/depends/packages/android_ndk.mk
@ -0,0 +1,22 @@
+package=android_ndk
+$(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
+
--- 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
--- 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 $(package)_config_cmds
--- a/contrib/depends/packages/packages.mk
+++ b/contrib/depends/packages/packages.mk
@ -1,6 +1,14 @@
-packages:=boost openssl zeromq cppzmq expat ldns libiconv hidapi protobuf libusb
+ifeq ($(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 

--- 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
--- 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

--- a/contrib/depends/patches/zeromq/ffe62d3398d5e0191f554f61049aa7ec9fc892ae.patch
+++ 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
+
--- 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(Terminfo_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()

--- a/contrib/gitian/README.md
+++ b/contrib/gitian/README.md
@ -226,3 +226,19 @@ To get all build options run:
 ./gitian-build.py --help
 ```

+Doing Successive Builds
+-----------------------
+
+If you need to do multiple iterations (while developing/testing) you can use the
+`--rebuild` option instead of `--build` on subsequent iterations. This skips the
+initial check for the freshness of the depends tools. In particular, doing this
+check all the time prevents rebuilding when you have no network access.
+
+
+Local-Only Builds
+-----------------
+
+If you need to run builds while disconnected from the internet, make sure you have
+local up-to-date repos in advance. Then specify your local repo using the `--url`
+option when building. This will avoid attempts to git pull across a network.
+
--- a/contrib/gitian/gitian-android.yml
+++ 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
+
--- a/contrib/gitian/gitian-build.py
+++ b/contrib/gitian/gitian-build.py
@ -46,19 +46,11 @@ def setup():
        print('Reboot is required')
        sys.exit(0)

-def build():
+def rebuild():
    global args, workdir

-    os.makedirs('out/' + args.version, exist_ok=True)
    print('\nBuilding Dependencies\n')
-    os.chdir('builder')
-    os.makedirs('inputs', exist_ok=True)
-
-    subprocess.check_call(['wget', '-N', '-P', 'inputs', 'https://downloads.sourceforge.net/project/osslsigncode/osslsigncode/osslsigncode-1.7.1.tar.gz'])
-    subprocess.check_call(['wget', '-N', '-P', 'inputs', 'https://bitcoincore.org/cfields/osslsigncode-Backports-to-1.7.1.patch'])
-    subprocess.check_output(["echo 'a8c4e9cafba922f89de0df1f2152e7be286aba73f78505169bc351a7938dd911 inputs/osslsigncode-Backports-to-1.7.1.patch' | sha256sum -c"], shell=True)
-    subprocess.check_output(["echo 'f9a8cdb38b9c309326764ebc937cba1523a3a751a7ab05df3ecc99d18ae466c9 inputs/osslsigncode-1.7.1.tar.gz' | sha256sum -c"], shell=True)
-    subprocess.check_call(['make', '-C', 'inputs/monero/contrib/depends', 'download', 'SOURCES_PATH=' + os.getcwd() + '/cache/common'])
+    os.makedirs('out/' + args.version, exist_ok=True)

    if args.linux:
        print('\nCompiling ' + args.version + ' Linux')
@ -66,6 +58,12 @@ 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'])
@ -84,17 +82,37 @@ 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])
        os.chdir(workdir)

+
+def build():
+    global args, workdir
+
+    print('\nChecking Depends Freshness\n')
+    os.chdir('builder')
+    os.makedirs('inputs', exist_ok=True)
+
+    subprocess.check_call(['wget', '-N', '-P', 'inputs', 'https://downloads.sourceforge.net/project/osslsigncode/osslsigncode/osslsigncode-1.7.1.tar.gz'])
+    subprocess.check_call(['wget', '-N', '-P', 'inputs', 'https://bitcoincore.org/cfields/osslsigncode-Backports-to-1.7.1.patch'])
+    subprocess.check_output(["echo 'a8c4e9cafba922f89de0df1f2152e7be286aba73f78505169bc351a7938dd911 inputs/osslsigncode-Backports-to-1.7.1.patch' | sha256sum -c"], shell=True)
+    subprocess.check_output(["echo 'f9a8cdb38b9c309326764ebc937cba1523a3a751a7ab05df3ecc99d18ae466c9 inputs/osslsigncode-1.7.1.tar.gz' | sha256sum -c"], shell=True)
+    subprocess.check_call(['make', '-C', 'inputs/monero/contrib/depends', 'download', 'SOURCES_PATH=' + os.getcwd() + '/cache/common'])
+
+    rebuild()
+
+
 def verify():
    global args, workdir
    os.chdir('builder')

    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 +129,9 @@ 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('-r', '--rebuild', action='store_true', dest='rebuild', help='Redo a Gitian build')
+    parser.add_argument('-R', '--rebuildsign', action='store_true', dest='rebuildsign', help='Redo and sign a Gitian build')
    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 +147,7 @@ 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

@ -136,6 +157,10 @@ def main():
        args.build = True
        args.sign = True

+    if args.rebuildsign:
+        args.rebuild = True
+        args.sign = True
+
    if args.kvm and args.docker:
        raise Exception('Error: cannot have both kvm and docker')

@ -152,9 +177,10 @@ def main():
            os.environ['LXC_GUEST_IP'] = '10.0.3.5'

    # Disable MacOS build if no SDK found
-    if args.build and args.macos and not os.path.isfile('builder/inputs/MacOSX10.11.sdk.tar.gz'):
-        print('Cannot build for MacOS, SDK does not exist. Will build for other OSes')
+    if args.macos and not os.path.isfile('builder/inputs/MacOSX10.11.sdk.tar.gz'):
        args.macos = False
+        if args.build:
+            print('Cannot build for MacOS, SDK does not exist. Will build for other OSes')

    script_name = os.path.basename(sys.argv[0])
    # Signer and version shouldn't be empty
@ -189,6 +215,10 @@ def main():
    if args.build:
        build()

+    if args.rebuild:
+        os.chdir('builder')
+        rebuild()
+
    if args.verify:
        verify()