Merge bitcoin/bitcoin#30049: build, test, doc: Temporarily remove Android-related stuff

5deb0b024e14c7c63d405c651d1ca323560a1c21 build, test, doc: Temporarily remove Android-related stuff (Hennadii Stepanov)

Pull request description:

  Previously, our Android builds were geared towards generating APKs, which relied on Qt. However, after migrating to C++20, compiling for Android became unfeasible due to Qt 5.15's compatibility limitations with NDK only up to r25, which includes an outdated embedded libc++ (see https://github.com/bitcoin/bitcoin/issues/29360).

  All removed stuff will be reinstated after migrating the build system to CMake and upgrading Qt to version 6.x.

  This PR makes possible a clean migration to the CMake-based build system as it removes code, which is not used at this moment.

ACKs for top commit:
  vasild:
    ACK 5deb0b024e14c7c63d405c651d1ca323560a1c21
  fanquake:
    ACK 5deb0b024e14c7c63d405c651d1ca323560a1c21 - given none of this is currently tested/wont compile. Can be revisted in future.

Tree-SHA512: 3bc2ccfe881e11cc1d78c27acd6f1d86cfba86821ef3bb5eca2e80d978fdfa13659ec82284dcaadc507e2394524dea91d4b8f81d0030c1cef9708df8be76bf07

6 files changed, 1 insertions, 62 deletions

diff --git a/depends/Makefile b/depends/Makefile
index 6883c0f971..fee426d8db 100644
--- a/depends/Makefile
+++ b/depends/Makefile
@@ -101,10 +101,6 @@ 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)
diff --git a/depends/README.md b/depends/README.md
index 10e0985cf4..17def65d3e 100644
--- a/depends/README.md
+++ b/depends/README.md
@@ -38,11 +38,8 @@ 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 unless targeting [Android](../doc/build-android.md).
+The paths are automatically configured and no other options are needed.
 
 ### Install the required dependencies: Ubuntu & Debian
 
diff --git a/depends/hosts/android.mk b/depends/hosts/android.mk
deleted file mode 100644
index a1c8c56dba..0000000000
--- a/depends/hosts/android.mk
+++ /dev/null
@@ -1,15 +0,0 @@
-ifeq ($(HOST),armv7a-linux-android)
-android_CXX=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)eabi$(ANDROID_API_LEVEL)-clang++
-android_CC=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)eabi$(ANDROID_API_LEVEL)-clang
-else
-android_CXX=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang++
-android_CC=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang
-endif
-
-android_CFLAGS=-std=$(C_STANDARD)
-android_CXXFLAGS=-std=$(CXX_STANDARD)
-
-android_AR=$(ANDROID_TOOLCHAIN_BIN)/llvm-ar
-android_RANLIB=$(ANDROID_TOOLCHAIN_BIN)/llvm-ranlib
-
-android_cmake_system=Android
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index 6e9180f546..ca54093339 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -5,12 +5,10 @@ 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_render libxcb_util_keysyms libxcb_util_image libxcb_util_wm
-qt_android_packages=qt
 qt_darwin_packages=qt
 qt_mingw32_packages=qt
 
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
index 0bf0c0036a..146e895c5a 100644
--- a/depends/packages/qt.mk
+++ b/depends/packages/qt.mk
@@ -12,7 +12,6 @@ $(package)_patches += qttools_src.pro
 $(package)_patches += mac-qmake.conf
 $(package)_patches += fix_qt_pkgconfig.patch
 $(package)_patches += no-xlib.patch
-$(package)_patches += fix_android_jni_static.patch
 $(package)_patches += dont_hardcode_pwd.patch
 $(package)_patches += qtbase-moc-ignore-gcc-macro.patch
 $(package)_patches += no_warnings_for_symbols.patch
@@ -186,24 +185,6 @@ $(package)_config_opts_mingw32 += -pch
 ifneq ($(LTO),)
 $(package)_config_opts_mingw32 += -ltcg
 endif
-
-$(package)_config_opts_android = -xplatform android-clang
-$(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 += -egl
-$(package)_config_opts_android += -no-dbus
-$(package)_config_opts_android += -opengl es2
-$(package)_config_opts_android += -qt-freetype
-$(package)_config_opts_android += -no-fontconfig
-$(package)_config_opts_android += -L $(host_prefix)/lib
-$(package)_config_opts_android += -I $(host_prefix)/include
-$(package)_config_opts_android += -pch
-$(package)_config_opts_android += -no-feature-vulkan
-
-$(package)_config_opts_aarch64_android += -android-arch arm64-v8a
-$(package)_config_opts_armv7a_android += -android-arch armeabi-v7a
-$(package)_config_opts_x86_64_android += -android-arch x86_64
 endef
 
 define $(package)_fetch_cmds
@@ -244,7 +225,6 @@ define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/fix-macos-linker.patch && \
   patch -p1 -i $($(package)_patch_dir)/dont_hardcode_pwd.patch && \
   patch -p1 -i $($(package)_patch_dir)/fix_qt_pkgconfig.patch && \
-  patch -p1 -i $($(package)_patch_dir)/fix_android_jni_static.patch && \
   patch -p1 -i $($(package)_patch_dir)/no-xlib.patch && \
   patch -p1 -i $($(package)_patch_dir)/qtbase-moc-ignore-gcc-macro.patch && \
   patch -p1 -i $($(package)_patch_dir)/memory_resource.patch && \
diff --git a/depends/patches/qt/fix_android_jni_static.patch b/depends/patches/qt/fix_android_jni_static.patch
deleted file mode 100644
index 79824f244a..0000000000
--- a/depends/patches/qt/fix_android_jni_static.patch
+++ /dev/null
@@ -1,17 +0,0 @@
---- old/qtbase/src/plugins/platforms/android/androidjnimain.cpp
-+++ new/qtbase/src/plugins/platforms/android/androidjnimain.cpp
-@@ -979,6 +979,14 @@ 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, env));
-+    if (ret != 0)
-+    {
-+        __android_log_print(ANDROID_LOG_FATAL, "Qt", "initJNI failed");
-+        return ret;
-+    }
-+
-     QWindowSystemInterfacePrivate::TabletEvent::setPlatformSynthesizesMouse(false);
- 
-     m_javaVM = vm;