Merge fec1a7029a into c5e44a0435

CMakeLists.txt

@@ -702,7 +702,11 @@ message("  bench_bitcoin ....................... ${BUILD_BENCH}")
 message("  fuzz binary ......................... ${BUILD_FUZZ_BINARY}")
 message("")
 if(CMAKE_CROSSCOMPILING)
-  set(cross_status "TRUE, for ${CMAKE_SYSTEM_NAME}, ${CMAKE_SYSTEM_PROCESSOR}")
+  if(ANDROID)
+    set(cross_status "TRUE, for ${CMAKE_SYSTEM_NAME}, ${CMAKE_ANDROID_ARCH_ABI}")
+  else()
+    set(cross_status "TRUE, for ${CMAKE_SYSTEM_NAME}, ${CMAKE_SYSTEM_PROCESSOR}")
+  endif()
 else()
   set(cross_status "FALSE")
 endif()

depends/Makefile

@@ -97,6 +97,10 @@ host_os+=$(findstring netbsd,$(full_host_os))
 host_os+=$(findstring openbsd,$(full_host_os))
 host_os+=$(findstring mingw32,$(full_host_os))
 
+ifeq (android,$(findstring android,$(full_host_os)))
+host_os:=android
+endif
+
 host_os:=$(strip $(host_os))
 ifeq ($(host_os),)
 host_os=$(full_host_os)
@@ -235,6 +239,10 @@ $(host_prefix)/toolchain.cmake : toolchain.cmake.in $(host_prefix)/.stamp_$(fina
             -e 's|@bdb_packages@|$(bdb_packages_)|' \
             -e 's|@usdt_packages@|$(usdt_packages_)|' \
             -e 's|@multiprocess@|$(MULTIPROCESS)|' \
+            -e 's|@android_abi@|$(android_abi)|' \
+            -e 's|@android_ndk@|$(ANDROID_NDK)|' \
+            -e 's|@android_toolchain_bin_dir@|$(android_toolchain_bin_dir)|' \
+            -e 's|@android_libcxx_shared_dir@|$(android_libcxx_shared_dir)|' \
             $< > $@
 	touch $@
 

depends/README.md

@@ -34,8 +34,11 @@ Common `host-platform-triplet`s for cross compilation are:
 - `riscv32-linux-gnu` for Linux RISC-V 32 bit
 - `riscv64-linux-gnu` for Linux RISC-V 64 bit
 - `s390x-linux-gnu` for Linux S390X
+- `armv7a-linux-android` for Android ARM 32 bit
+- `aarch64-linux-android` for Android ARM 64 bit
+- `x86_64-linux-android` for Android x86 64 bit
 
-The paths are automatically configured and no other options are needed.
+The paths are automatically configured and no other options are needed unless targeting [Android](../doc/build-android.md).
 
 ### Install the required dependencies: Ubuntu & Debian
 

depends/funcs.mk

@@ -207,33 +207,45 @@ ifneq ($($(1)_ldflags),)
 $(1)_autoconf += LDFLAGS="$$($(1)_ldflags)"
 endif
 
+$(1)_cmake = env CFLAGS="$$($(1)_cppflags) $$($(1)_cflags)" \
+                 CXXFLAGS="$$($(1)_cppflags) $$($(1)_cxxflags)" \
+                 LDFLAGS="$$($(1)_ldflags)"
+ifeq ($(host_os),android)
+    # For Android, we use the toolchain file provided by the Android SDK.
+    # See: https://developer.android.com/ndk/guides/cmake
+    $(1)_cmake += cmake \
+                    -DANDROID_ABI=$(android_abi) \
+                    -DANDROID_PLATFORM=android-$(android_cmake_system_version) \
+                    -DCMAKE_TOOLCHAIN_FILE:FILEPATH=$(ANDROID_NDK)/build/cmake/android.toolchain.cmake
+else
+    $(1)_cmake += CC="$$($(1)_cc)" \
+                  CXX="$$($(1)_cxx)"
+    $(1)_cmake += cmake \
+                    -DCMAKE_AR=`which $$($(1)_ar)` \
+                    -DCMAKE_NM=`which $$($FILEPATH(1)_nm)` \
+                    -DCMAKE_RANLIB=`which $$($(1)_ranlib)`
+endif
+$(1)_cmake += -G "Unix Makefiles" \
+              -DCMAKE_INSTALL_PREFIX:PATH="$$($($(1)_type)_prefix)" \
+              -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+              -DCMAKE_VERBOSE_MAKEFILE:BOOL=$(V) \
+              $$($(1)_config_opts)
 # We hardcode the library install path to "lib" to match the PKG_CONFIG_PATH
 # setting in depends/toolchain.cmake.in, which also hardcodes "lib".
 # Without this setting, CMake by default would use the OS library
 # directory, which might be "lib64" or something else, not "lib", on multiarch systems.
-$(1)_cmake=env CC="$$($(1)_cc)" \
+$(1)_cmake += -DCMAKE_INSTALL_LIBDIR=lib/
-               CFLAGS="$$($(1)_cppflags) $$($(1)_cflags)" \
-               CXX="$$($(1)_cxx)" \
-               CXXFLAGS="$$($(1)_cppflags) $$($(1)_cxxflags)" \
-               LDFLAGS="$$($(1)_ldflags)" \
-               cmake -G "Unix Makefiles" \
-               -DCMAKE_INSTALL_PREFIX:PATH="$$($($(1)_type)_prefix)" \
-               -DCMAKE_AR=`which $$($(1)_ar)` \
-               -DCMAKE_NM=`which $$($(1)_nm)` \
-               -DCMAKE_RANLIB=`which $$($(1)_ranlib)` \
-               -DCMAKE_INSTALL_LIBDIR=lib/ \
-               -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
-               -DCMAKE_VERBOSE_MAKEFILE:BOOL=$(V) \
-               $$($(1)_config_opts)
 ifeq ($($(1)_type),build)
 $(1)_cmake += -DCMAKE_INSTALL_RPATH:PATH="$$($($(1)_type)_prefix)/lib"
 else
 ifneq ($(host),$(build))
+ifneq ($(host_os),android)
 $(1)_cmake += -DCMAKE_SYSTEM_NAME=$($(host_os)_cmake_system_name)
 $(1)_cmake += -DCMAKE_C_COMPILER_TARGET=$(host)
 $(1)_cmake += -DCMAKE_CXX_COMPILER_TARGET=$(host)
 endif
 endif
+endif
 endef
 
 define int_add_cmds

depends/hosts/android.mk

@@ -0,0 +1,31 @@
+ANDROID_API_LEVEL ?= 26
+
+android_toolchain_bin_dir := $(ANDROID_NDK)/toolchains/llvm/prebuilt/$(build_os)-$(build_arch)/bin
+
+ifeq ($(HOST),armv7a-linux-android)
+android_CXX := $(android_toolchain_bin_dir)/$(HOST)eabi$(ANDROID_API_LEVEL)-clang++
+android_CC  := $(android_toolchain_bin_dir)/$(HOST)eabi$(ANDROID_API_LEVEL)-clang
+android_libcxx_shared_dir := arm-linux-androideabi
+else
+android_CXX := $(android_toolchain_bin_dir)/$(HOST)$(ANDROID_API_LEVEL)-clang++
+android_CC  := $(android_toolchain_bin_dir)/$(HOST)$(ANDROID_API_LEVEL)-clang
+android_libcxx_shared_dir := $(host_arch)-linux-android
+endif
+
+android_CXXFLAGS := -std=$(CXX_STANDARD)
+android_CFLAGS   := -std=$(C_STANDARD)
+
+android_AR := $(android_toolchain_bin_dir)/llvm-ar
+android_RANLIB := $(android_toolchain_bin_dir)/llvm-ranlib
+
+android_cmake_system_name := Android
+android_cmake_system_version := $(ANDROID_API_LEVEL)
+
+# https://developer.android.com/ndk/guides/abis
+ifeq ($(host_arch),armv7a)
+  android_abi := armeabi-v7a
+else ifeq ($(host_arch),aarch64)
+  android_abi := arm64-v8a
+else ifeq ($(host_arch),x86_64)
+  android_abi := x86_64
+endif

depends/packages/libevent.mk

@@ -4,6 +4,7 @@ $(package)_download_path=https://github.com/libevent/libevent/releases/download/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_sha256_hash=92e6de1be9ec176428fd2367677e61ceffc2ee1cb119035037a27d346b0403bb
 $(package)_patches=cmake_fixups.patch
+$(package)_patches += android_threads_fixup.patch
 $(package)_patches += netbsd_fixup.patch
 $(package)_build_subdir=build
 
@@ -21,6 +22,7 @@ endef
 
 define $(package)_preprocess_cmds
   patch -p1 < $($(package)_patch_dir)/cmake_fixups.patch && \
+  patch -p1 < $($(package)_patch_dir)/android_threads_fixup.patch && \
   patch -p1 < $($(package)_patch_dir)/netbsd_fixup.patch
 endef
 

depends/packages/packages.mk

@@ -5,10 +5,12 @@ boost_packages = boost
 libevent_packages = libevent
 
 qrencode_linux_packages = qrencode
+qrencode_android_packages = qrencode
 qrencode_darwin_packages = qrencode
 qrencode_mingw32_packages = qrencode
 
 qt_linux_packages:=qt expat libxcb xcb_proto libXau xproto freetype fontconfig libxkbcommon libxcb_util libxcb_util_cursor libxcb_util_render libxcb_util_keysyms libxcb_util_image libxcb_util_wm
+qt_android_packages=qt
 qt_darwin_packages=qt
 qt_mingw32_packages=qt
 ifneq ($(host),$(build))

depends/packages/qt.mk

@@ -10,6 +10,8 @@ endif
 $(package)_linux_dependencies=freetype fontconfig libxcb libxkbcommon libxcb_util libxcb_util_cursor libxcb_util_render libxcb_util_keysyms libxcb_util_image libxcb_util_wm
 $(package)_patches_path := $(qt_details_patches_path)
 $(package)_patches := dont_hardcode_pwd.patch
+$(package)_patches += fix_android_duplicate_symbol.patch
+$(package)_patches += fix_android_jni_static.patch
 $(package)_patches += qtbase-moc-ignore-gcc-macro.patch
 $(package)_patches += qtbase_avoid_native_float16.patch
 $(package)_patches += qtbase_avoid_qmain.patch
@@ -154,6 +156,16 @@ ifneq ($(LTO),)
 $(package)_config_opts_mingw32 += -ltcg
 endif
 
+$(package)_config_opts_android  = -android-sdk $(ANDROID_SDK)
+$(package)_config_opts_android += -android-ndk $(ANDROID_NDK)
+$(package)_config_opts_android += -android-ndk-platform android-$(ANDROID_API_LEVEL)
+$(package)_config_opts_android += -android-abis $(android_abi)
+$(package)_config_opts_android += -egl
+$(package)_config_opts_android += -no-dbus
+$(package)_config_opts_android += -no-fontconfig
+$(package)_config_opts_android += -opengl es2
+$(package)_config_opts_android += -qt-freetype
+
 # CMake build options.
 $(package)_config_env := CC="$$($(package)_cc)"
 $(package)_config_env += CXX="$$($(package)_cxx)"
@@ -257,6 +269,8 @@ endif
 
 define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/dont_hardcode_pwd.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_android_duplicate_symbol.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_android_jni_static.patch && \
   patch -p1 -i $($(package)_patch_dir)/qtbase-moc-ignore-gcc-macro.patch && \
   patch -p1 -i $($(package)_patch_dir)/qtbase_avoid_native_float16.patch && \
   patch -p1 -i $($(package)_patch_dir)/qtbase_avoid_qmain.patch && \
@@ -281,6 +295,9 @@ endef
 define $(package)_stage_cmds
   cmake --install . --prefix $($(package)_staging_prefix_dir)
 endef
+ifeq ($(host_os),android)
+  $(package)_stage_cmds += && cp -r $($(package)_extract_dir)/qtbase/src/android/jar/src $($(package)_staging_prefix_dir)/src/android/java
+endif
 
 define $(package)_postprocess_cmds
   rm -rf doc/

depends/patches/libevent/android_threads_fixup.patch

@@ -0,0 +1,21 @@
+cmake: Fix Android build.
+Android/Bionic C library needs no special flags to have threading support.
+Found when trying to build with vcpkg.
+
+See https://github.com/libevent/libevent/commit/8f47d8de281b877450474734594fdc0a60ee35d1.
+
+
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -858,6 +858,11 @@ endif()
+ if (NOT EVENT__DISABLE_THREAD_SUPPORT)
+     if (WIN32)
+         list(APPEND SRC_CORE evthread_win32.c)
++    elseif(ANDROID)
++        # pthreads is built in to bionic
++        set(EVENT__HAVE_PTHREADS 1)
++        CHECK_TYPE_SIZE(pthread_t EVENT__SIZEOF_PTHREAD_T)
++        list(APPEND SYMBOLS_TO_CHECK pthread_mutexattr_setprotocol)
+     else()
+         find_package(Threads REQUIRED)
+         if (NOT CMAKE_USE_PTHREADS_INIT)

depends/patches/qt/fix_android_duplicate_symbol.patch

@@ -0,0 +1,157 @@
+Fix "duplicate symbol: JNI_OnLoad" linker error
+
+Qt does not officially support static linking on Android. See:
+ - https://bugreports.qt.io/browse/QTBUG-36097
+ - https://bugreports.qt.io/browse/QTBUG-102326
+
+Reverting upstream commit 175e3ac8fabc864ffcc23c7769eaf7f220bddf59
+avoids the linker error.
+
+Note: the revert is not clean and required minor adjustments.
+
+
+--- a/qtbase/src/corelib/CMakeLists.txt
++++ b/qtbase/src/corelib/CMakeLists.txt
+@@ -1016,6 +1016,7 @@ qt_internal_extend_target(Core CONDITION ANDROID
+         kernel/qjnienvironment.cpp kernel/qjnienvironment.h
+         kernel/qjniobject.cpp kernel/qjniobject.h
+         kernel/qjnihelpers.cpp kernel/qjnihelpers_p.h
++        kernel/qjnionload.cpp
+         platform/android/qandroidextras_p.h platform/android/qandroidextras.cpp
+         platform/android/qandroidnativeinterface.cpp
+     NO_UNITY_BUILD_SOURCES
+
+
+--- a/qtbase/src/corelib/kernel/qjnihelpers.cpp
++++ b/qtbase/src/corelib/kernel/qjnihelpers.cpp
+@@ -12,7 +12,6 @@
+ #include <QtCore/private/qcoreapplication_p.h>
+ #include <QtCore/private/qlocking_p.h>
+ 
+-#include <android/log.h>
+ #include <deque>
+ #include <memory>
+ 
+@@ -349,38 +348,3 @@ void QtAndroidPrivate::releaseAndroidDeadlockProtector()
+ }
+ 
+ QT_END_NAMESPACE
+-
+-JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
+-{
+-    Q_UNUSED(reserved);
+-
+-    static const char logTag[] = "QtCore";
+-    static bool initialized = false;
+-    if (initialized)
+-        return JNI_VERSION_1_6;
+-    initialized = true;
+-
+-    typedef union {
+-        JNIEnv *nenv;
+-        void *venv;
+-    } _JNIEnv;
+-
+-    __android_log_print(ANDROID_LOG_INFO, logTag, "Start");
+-
+-    _JNIEnv uenv;
+-    uenv.venv = nullptr;
+-
+-    if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_6) != JNI_OK) {
+-        __android_log_print(ANDROID_LOG_FATAL, logTag, "GetEnv failed");
+-        return JNI_ERR;
+-    }
+-
+-    JNIEnv *env = uenv.nenv;
+-    const jint ret = QT_PREPEND_NAMESPACE(QtAndroidPrivate::initJNI(vm, env));
+-    if (ret != 0) {
+-        __android_log_print(ANDROID_LOG_FATAL, logTag, "initJNI failed");
+-        return ret;
+-    }
+-
+-    return JNI_VERSION_1_6;
+-}
+
+
+--- /dev/null
++++ b/qtbase/src/corelib/kernel/qjnionload.cpp
+@@ -0,0 +1,79 @@
++/****************************************************************************
++**
++** Copyright (C) 2021 The Qt Company Ltd.
++** Contact: https://www.qt.io/licensing/
++**
++** This file is part of the QtCore module of the Qt Toolkit.
++**
++** $QT_BEGIN_LICENSE:LGPL$
++** Commercial License Usage
++** Licensees holding valid commercial Qt licenses may use this file in
++** accordance with the commercial license agreement provided with the
++** Software or, alternatively, in accordance with the terms contained in
++** a written agreement between you and The Qt Company. For licensing terms
++** and conditions see https://www.qt.io/terms-conditions. For further
++** information use the contact form at https://www.qt.io/contact-us.
++**
++** GNU Lesser General Public License Usage
++** Alternatively, this file may be used under the terms of the GNU Lesser
++** General Public License version 3 as published by the Free Software
++** Foundation and appearing in the file LICENSE.LGPL3 included in the
++** packaging of this file. Please review the following information to
++** ensure the GNU Lesser General Public License version 3 requirements
++** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
++**
++** GNU General Public License Usage
++** Alternatively, this file may be used under the terms of the GNU
++** General Public License version 2.0 or (at your option) the GNU General
++** Public license version 3 or any later version approved by the KDE Free
++** Qt Foundation. The licenses are as published by the Free Software
++** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
++** included in the packaging of this file. Please review the following
++** information to ensure the GNU General Public License requirements will
++** be met: https://www.gnu.org/licenses/gpl-2.0.html and
++** https://www.gnu.org/licenses/gpl-3.0.html.
++**
++** $QT_END_LICENSE$
++**
++****************************************************************************/
++
++#include "qjnihelpers_p.h"
++
++#include <jni.h>
++#include <android/log.h>
++
++static const char logTag[] = "QtCore";
++
++Q_CORE_EXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
++{
++    Q_UNUSED(reserved);
++
++    static bool initialized = false;
++    if (initialized)
++        return JNI_VERSION_1_6;
++    initialized = true;
++
++    typedef union {
++        JNIEnv *nenv;
++        void *venv;
++    } _JNIEnv;
++
++    __android_log_print(ANDROID_LOG_INFO, logTag, "Start");
++
++    _JNIEnv uenv;
++    uenv.venv = nullptr;
++
++    if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_6) != JNI_OK) {
++        __android_log_print(ANDROID_LOG_FATAL, logTag, "GetEnv failed");
++        return JNI_ERR;
++    }
++
++    JNIEnv *env = uenv.nenv;
++    const jint ret = QT_PREPEND_NAMESPACE(QtAndroidPrivate::initJNI(vm, env));
++    if (ret != 0) {
++        __android_log_print(ANDROID_LOG_FATAL, logTag, "initJNI failed");
++        return ret;
++    }
++
++    return JNI_VERSION_1_6;
++}

depends/patches/qt/fix_android_jni_static.patch

@@ -0,0 +1,16 @@
+--- a/qtbase/src/plugins/platforms/android/androidjnimain.cpp
++++ b/qtbase/src/plugins/platforms/android/androidjnimain.cpp
+@@ -895,6 +895,13 @@ Q_DECL_EXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void */*reserved*/)
+         __android_log_print(ANDROID_LOG_FATAL, "Qt", "registerNatives failed");
+         return -1;
+     }
++
++    const jint ret = QT_PREPEND_NAMESPACE(QtAndroidPrivate::initJNI(vm, QJniEnvironment::getJniEnv()));
++    if (ret != 0) {
++        __android_log_print(ANDROID_LOG_FATAL, "Qt", "initJNI failed");
++        return ret;
++    }
++
+     QWindowSystemInterfacePrivate::TabletEvent::setPlatformSynthesizesMouse(false);
+ 
+     // attach qt main thread data to this thread

depends/toolchain.cmake.in

@@ -2,21 +2,54 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or https://opensource.org/license/mit/.
 
-# This file is expected to be highly volatile and may still change substantially.
+if("@host_system_name@" STREQUAL "Android")
+  # For Android, we use the toolchain file provided by the Android SDK.
+  # See: https://developer.android.com/ndk/guides/cmake
+  set(ANDROID_ABI @android_abi@)
+  set(ANDROID_PLATFORM android-@host_system_version@)
+  include(@android_ndk@/build/cmake/android.toolchain.cmake)
+  # Qt's Java sources for Android Application Package (APK).
+  cmake_path(SET ANDROID_APK_SRC "${CMAKE_CURRENT_LIST_DIR}/src/android/java")
+  # The libc++_shared.so shared library, provided by the Android SDK,
+  # is required to build an Android Application Package (APK).
+  cmake_path(SET ANDROID_SHARED_CXX_LIB NORMALIZE "@android_toolchain_bin_dir@/../sysroot/usr/lib/@android_libcxx_shared_dir@/libc++_shared.so")
+  # Qt recommends using the same Gradle version that it comes with.
+  # Therefore, we use the Gradle wrapper provided by Qt to build
+  # an Android Application Package (APK).
+  # See:
+  # - https://doc.qt.io/qt-6/deployment-android.html
+  # - https://doc.qt.io/qt-6/qtcore-attribution-android-gradle-wrapper.html
+  cmake_path(SET GRADLEW_EXECUTABLE "${CMAKE_CURRENT_LIST_DIR}/src/3rdparty/gradle/gradlew")
+else()
+  # If CMAKE_SYSTEM_NAME is set within a toolchain file, CMake will also
+  # set CMAKE_CROSSCOMPILING to TRUE, even if CMAKE_SYSTEM_NAME matches
+  # CMAKE_HOST_SYSTEM_NAME. To avoid potential misconfiguration of CMake,
+  # it is best not to touch CMAKE_SYSTEM_NAME unless cross-compiling is
+  # intended.
+  if(@depends_crosscompiling@)
+    set(CMAKE_SYSTEM_NAME @host_system_name@)
+    set(CMAKE_SYSTEM_VERSION @host_system_version@)
+    set(CMAKE_SYSTEM_PROCESSOR @host_arch@)
 
-# If CMAKE_SYSTEM_NAME is set within a toolchain file, CMake will also
+    set(CMAKE_C_COMPILER_TARGET @host@)
-# set CMAKE_CROSSCOMPILING to TRUE, even if CMAKE_SYSTEM_NAME matches
+    set(CMAKE_CXX_COMPILER_TARGET @host@)
-# CMAKE_HOST_SYSTEM_NAME. To avoid potential misconfiguration of CMake,
+    set(CMAKE_OBJCXX_COMPILER_TARGET @host@)
-# it is best not to touch CMAKE_SYSTEM_NAME unless cross-compiling is
+  endif()
-# intended.
-if(@depends_crosscompiling@)
-  set(CMAKE_SYSTEM_NAME @host_system_name@)
-  set(CMAKE_SYSTEM_VERSION @host_system_version@)
-  set(CMAKE_SYSTEM_PROCESSOR @host_arch@)
 
-  set(CMAKE_C_COMPILER_TARGET @host@)
+  if(NOT DEFINED CMAKE_C_COMPILER)
-  set(CMAKE_CXX_COMPILER_TARGET @host@)
+    set(CMAKE_C_COMPILER @CC@)
-  set(CMAKE_OBJCXX_COMPILER_TARGET @host@)
+  endif()
+
+  if(NOT DEFINED CMAKE_CXX_COMPILER)
+    set(CMAKE_CXX_COMPILER @CXX@)
+    set(CMAKE_OBJCXX_COMPILER ${CMAKE_CXX_COMPILER})
+  endif()
+
+  set(CMAKE_AR "@AR@")
+  set(CMAKE_RANLIB "@RANLIB@")
+  set(CMAKE_STRIP "@STRIP@")
+  set(CMAKE_OBJCOPY "@OBJCOPY@")
+  set(CMAKE_OBJDUMP "@OBJDUMP@")
 endif()
 
 if(NOT DEFINED CMAKE_C_FLAGS_INIT)
@@ -29,10 +62,6 @@ if(NOT DEFINED CMAKE_C_FLAGS_DEBUG_INIT)
   set(CMAKE_C_FLAGS_DEBUG_INIT "@CFLAGS_DEBUG@")
 endif()
 
-if(NOT DEFINED CMAKE_C_COMPILER)
-  set(CMAKE_C_COMPILER @CC@)
-endif()
-
 if(NOT DEFINED CMAKE_CXX_FLAGS_INIT)
   set(CMAKE_CXX_FLAGS_INIT "@CXXFLAGS@")
   set(CMAKE_OBJCXX_FLAGS_INIT "@CXXFLAGS@")
@@ -46,11 +75,6 @@ if(NOT DEFINED CMAKE_CXX_FLAGS_DEBUG_INIT)
   set(CMAKE_OBJCXX_FLAGS_DEBUG_INIT "@CXXFLAGS_DEBUG@")
 endif()
 
-if(NOT DEFINED CMAKE_CXX_COMPILER)
-  set(CMAKE_CXX_COMPILER @CXX@)
-  set(CMAKE_OBJCXX_COMPILER ${CMAKE_CXX_COMPILER})
-endif()
-
 # The DEPENDS_COMPILE_DEFINITIONS* variables are to be treated as lists.
 set(DEPENDS_COMPILE_DEFINITIONS @CPPFLAGS@)
 set(DEPENDS_COMPILE_DEFINITIONS_RELWITHDEBINFO @CPPFLAGS_RELEASE@)
@@ -75,12 +99,6 @@ if(NOT DEFINED CMAKE_SHARED_LINKER_FLAGS_DEBUG_INIT)
   set(CMAKE_SHARED_LINKER_FLAGS_DEBUG_INIT "@LDFLAGS_DEBUG@")
 endif()
 
-set(CMAKE_AR "@AR@")
-set(CMAKE_RANLIB "@RANLIB@")
-set(CMAKE_STRIP "@STRIP@")
-set(CMAKE_OBJCOPY "@OBJCOPY@")
-set(CMAKE_OBJDUMP "@OBJDUMP@")
-
 # Using our own built dependencies should not be
 # affected by a potentially random environment.
 set(CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH OFF)

doc/README.md

@@ -45,6 +45,7 @@ The following are developer notes on how to build Bitcoin Core on your native pl
 - [FreeBSD Build Notes](build-freebsd.md)
 - [OpenBSD Build Notes](build-openbsd.md)
 - [NetBSD Build Notes](build-netbsd.md)
+- [Android Build Notes](build-android.md)
 
 Development
 ---------------------

doc/build-android.md

@@ -0,0 +1,44 @@
+# Android Build Guide
+
+This guide describes how to build and package the `bitcoin-qt` GUI for Android on Linux and macOS.
+
+
+## Dependencies
+
+Before proceeding with an Android build one needs to get the [Android SDK](https://developer.android.com/studio) and use the "SDK Manager" tool to download the NDK and one or more "Platform packages" (these are Android versions and have a corresponding API level).
+
+Qt 6.7.3 used in depends supports Android NDK version is [r26b (26.1.10909125)](https://github.com/android/ndk/wiki/Changelog-r26).
+
+In order to build `ANDROID_API_LEVEL` (API level corresponding to the Android version targeted, e.g. Android 9.0 Pie is 28 and its "Platform package" needs to be available) needs to be set.
+
+Qt 6.7.3 used in depends supports API levels from 26 to 34.
+
+When building [depends](../depends/README.md), additional variables `ANDROID_SDK` and `ANDROID_NDK` need to be set.
+
+This is an example command for a default build with no disabled dependencies:
+
+    gmake HOST=aarch64-linux-android ANDROID_SDK=/home/user/Android/Sdk ANDROID_NDK=/home/user/Android/Sdk/ndk/26.1.10909125 ANDROID_API_LEVEL=34
+
+
+## Building and packaging
+
+After the depends are built configure, build and create an Android Application Package (APK) as follows (based on the example above):
+
+```bash
+cmake -B build --toolchain depends/aarch64-linux-android/toolchain.cmake
+cmake --build build --target apk_package  # Use "-j N" for N parallel jobs.
+```
+
+The APKs will be available in the following directory:
+```bash
+$ tree build/src/qt/android/build/outputs/apk
+build/src/qt/android/build/outputs/apk
+├── debug
+│   ├── android-debug.apk
+│   └── output-metadata.json
+└── release
+    ├── android-release-unsigned.apk
+    └── output-metadata.json
+
+3 directories, 4 files
+```

src/qt/CMakeLists.txt

@@ -15,13 +15,18 @@ get_target_property(qt_lib_type Qt6::Core TYPE)
 
 function(import_plugins target)
   if(qt_lib_type STREQUAL "STATIC_LIBRARY")
-    set(plugins Qt6::QMinimalIntegrationPlugin)
+    set(plugins "")
+    if(TARGET Qt6::QMinimalIntegrationPlugin)
+      list(APPEND plugins Qt6::QMinimalIntegrationPlugin)
+    endif()
     if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
       list(APPEND plugins Qt6::QXcbIntegrationPlugin)
     elseif(WIN32)
       list(APPEND plugins Qt6::QWindowsIntegrationPlugin Qt6::QModernWindowsStylePlugin)
     elseif(APPLE)
       list(APPEND plugins Qt6::QCocoaIntegrationPlugin Qt6::QMacStylePlugin)
+    elseif(ANDROID)
+      list(APPEND plugins Qt6::QAndroidIntegrationPlugin Qt6::QAndroidStylePlugin)
     endif()
     qt6_import_plugins(${target}
       INCLUDE ${plugins}
@@ -357,3 +362,7 @@ else()
     VERBATIM
   )
 endif()
+
+if(ANDROID)
+  add_subdirectory(android)
+endif()

src/qt/android/AndroidManifest.xml

@@ -0,0 +1,35 @@
+<?xml version='1.0' encoding='utf-8'?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="1.0" android:versionCode="1" android:installLocation="auto">
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
+    <uses-feature android:glEsVersion="0x00020000" android:required="true" />
+
+    <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
+
+    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt.android.bindings.QtApplication" android:label="Bitcoin Core" android:icon="@drawable/bitcoin">
+        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
+                  android:name="org.bitcoincore.qt.BitcoinQtActivity"
+                  android:screenOrientation="unspecified"
+                  android:launchMode="singleTop"
+                  android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+
+            <meta-data android:name="android.app.arguments" android:value="-testnet"/>
+            <meta-data android:name="android.app.lib_name" android:value="bitcoin-qt"/>
+            <meta-data android:name="android.app.repository" android:value="default"/>
+            <meta-data android:name="android.app.bundle_local_qt_libs" android:value="1"/>
+            <meta-data android:name="android.app.use_local_qt_libs" android:value="1"/>
+            <meta-data android:name="android.app.libs_prefix" android:value="/data/local/tmp/qt/"/>
+            <meta-data android:name="android.app.system_libs_prefix" android:value="/system/lib/"/>
+            <meta-data android:name="android.app.background_running" android:value="true"/>
+            <meta-data android:name="android.app.auto_screen_scale_factor" android:value="true"/>
+            <meta-data android:name="android.app.extract_android_style" android:value="default"/>
+            <meta-data android:name="android.app.load_local_libs_resource_id" android:resource="@array/load_local_libs"/>
+        </activity>
+
+    </application>
+</manifest>

src/qt/android/CMakeLists.txt

@@ -0,0 +1,19 @@
+# Copyright (c) 2025 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR}
+  PATTERN "CMakeLists.txt" EXCLUDE
+)
+
+file(COPY ${ANDROID_APK_SRC}/src/org DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/src)
+
+file(COPY ${ANDROID_SHARED_CXX_LIB} DESTINATION libs/${CMAKE_ANDROID_ARCH_ABI})
+
+cmake_path(RELATIVE_PATH GRADLEW_EXECUTABLE BASE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+add_custom_target(apk_package
+  COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:bitcoin-qt> libs/${CMAKE_ANDROID_ARCH_ABI}/libbitcoin-qt_${CMAKE_ANDROID_ARCH_ABI}.so
+  COMMAND ${GRADLEW_EXECUTABLE} build
+  VERBATIM
+)

src/qt/android/build.gradle

@@ -0,0 +1,51 @@
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.0.2'
+    }
+}
+
+repositories {
+    google()
+    mavenCentral()
+}
+
+apply plugin: 'com.android.application'
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+}
+
+android {
+    compileSdkVersion androidCompileSdkVersion.toInteger()
+
+    buildToolsVersion androidBuildToolsVersion
+
+    namespace 'org.bitcoincore.qt'
+
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = [qtAndroidDir + '/src', 'src', 'java']
+            aidl.srcDirs = [qtAndroidDir + '/src', 'src', 'aidl']
+            res.srcDirs = [qtAndroidDir + '/res', 'res']
+            resources.srcDirs = ['src']
+            renderscript.srcDirs = ['src']
+            assets.srcDirs = ['assets']
+            jniLibs.srcDirs = ['libs']
+       }
+    }
+
+    lintOptions {
+        abortOnError false
+    }
+
+    defaultConfig {
+        minSdkVersion 26
+        targetSdk 33
+    }
+}

src/qt/android/gradle.properties

@@ -0,0 +1,4 @@
+androidBuildToolsVersion=33.0.3
+androidCompileSdkVersion=33
+qtAndroidDir=new File(".").absolutePath
+org.gradle.jvmargs=-Xmx4608M

src/qt/android/res/values/libs.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <array name="load_local_libs">
+        <item>
+            arm64-v8a;libbitcoin-qt_arm64-v8a.so
+        </item>
+        <item>
+            armeabi-v7a;libbitcoin-qt_armeabi-v7a.so
+        </item>
+        <item>
+            x86_64;libbitcoin-qt_x86_64.so
+        </item>
+    </array>
+</resources>

src/qt/android/src/org/bitcoincore/qt/BitcoinQtActivity.java

@@ -0,0 +1,23 @@
+package org.bitcoincore.qt;
+
+import android.os.Bundle;
+import android.system.ErrnoException;
+import android.system.Os;
+
+import org.qtproject.qt.android.bindings.QtActivity;
+
+import java.io.File;
+
+public class BitcoinQtActivity extends QtActivity
+{
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        final File bitcoinDir = new File(getFilesDir().getAbsolutePath() + "/.bitcoin");
+        if (!bitcoinDir.exists()) {
+            bitcoinDir.mkdir();
+        }
+
+        super.onCreate(savedInstanceState);
+    }
+}