There was a bug in QT 5.15.2 that results in app crash on Android 5.1 and a patch:
Submodule qtbase contains modified content
diff --git a/qtbase/src/corelib/plugin/qlibrary_unix.cpp b/qtbase/src/corelib/plugin/qlibrary_unix.cpp
index a5c72f81d9..5cd21b67a4 100644
--- a/qtbase/src/corelib/plugin/qlibrary_unix.cpp
+++ b/qtbase/src/corelib/plugin/qlibrary_unix.cpp
@@ -243,10 +243,10 @@ bool QLibraryPrivate::load_sys()
}
if (hnd) {
using JniOnLoadPtr = jint (*)(JavaVM *vm, void *reserved);
- JniOnLoadPtr jniOnLoad = reinterpret_cast<JniOnLoadPtr>(dlsym(pHnd, "JNI_OnLoad"));
+ JniOnLoadPtr jniOnLoad = reinterpret_cast<JniOnLoadPtr>(dlsym(hnd, "JNI_OnLoad"));
if (jniOnLoad && jniOnLoad(QtAndroidPrivate::javaVM(), nullptr) == JNI_ERR) {
dlclose(hnd);
- pHnd = nullptr;
+ hnd = nullptr;
}
}
#endif
Looks like it was simply a typo and pHnd was replaced with hnd.
QT 5.15.3 where the bug was fixed is commercial so I applied the patch by myself (thanks to danilabagroff from stackoverflow.com):
git clone --recursive https://code.qt.io/qt/qt5.git --branch v5.15.2
cd qt5/qtbase/
git checkout -b my
cd ..
git apply /e/temp/android-qt5.15.1.patch
cd qtbase/
git diff
git commit -a -m "fixed QTBUG-84849 that results in app crash on Android 5.1"
Then I built QT for Android with the following commands:
set "JDK_ROOT=C:\Program Files\Android\Android Studio\jre\bin"
set "MINGW_ROOT=E:\PFiles\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin"
set "PERL_ROOT=E:\PFiles\Strawberry\perl\bin"
set PATH=;%JDK_ROOT%;%PATH%
set PATH=;%MINGW_ROOT%;%PATH%
set PATH=;%PERL_ROOT%;%PATH%
set PATH=E:\PFiles\Python35;%PATH%
rem Check if the tools are in PATH
where gcc
where mingw32-make.exe
where perl.exe
where javac.exe
where python.exe
set "ANDROID_SDK_ROOT=C:\Users\D-Ef\AppData\Local\Android\Sdk"
set "ANDROID_NDK_PATH=C:\Users\D-Ef\AppData\Local\Android\Sdk\ndk\21.3.6528147"
rem See qtbase\mkspecs\android-clang\qmake.conf
set "ANDROID_NDK_PLATFORM=android-21"
rem see %ANDROID_SDK_ROOT%\build-tools folder
set "ANDROID_BUILD_TOOLS_REVISION=29.0.2"
rem Probably I need the next line
rem set "ANDROID_TARGET_SDK_VERSION=29"
rem QT_NO_EXCEPTIONS disables "try { } catch (...) {}" surrounding the user code in qthread_unix.cpp
configure.bat -prefix E:\Qt\Qt5.15.2\android -DQT_NO_EXCEPTIONS -release -force-debug-info -platform win32-g++ -opengl es2 -xplatform android-clang ^
-android-ndk %ANDROID_NDK_PATH% -android-sdk %ANDROID_SDK_ROOT% ^
-opensource -confirm-license -nomake tests -nomake examples ^
-skip networkauth -skip serialport -skip serialbus -skip activeqt -skip quick3d -skip quicktimeline -skip lottie -skip remoteobjects -skip scxml ^
-skip websockets -skip webglplugin -skip webchannel -skip gamepad -skip 3d -skip wayland -skip connectivity -skip sensors -skip script ^
-skip location -skip xmlpatterns -skip speech -skip virtualkeyboard -skip datavis3d -skip charts -skip webengine -skip webview -skip doc ^
-skip macextras -skip x11extras -skip winextras
mingw32-make.exe -j4
mingw32-make install
Build configuration summary:
Building on: win32-g++ (x86_64, CPU features: cx16 mmx sse sse2 sse3)
Building for: android-clang (arm64, CPU features: neon)
Target compiler: clang 9.0.8
Configuration: cross_compile compile_examples enable_new_dtags force_debug_info neon precompile_header shared shared release c++11 c++14 c++17 c++1z concurrent no-pkg-config reduce_exports stl
Build options:
Mode ................................... release (with debug info)
Optimize release build for size ........ no
Building shared libraries .............. yes
Using C standard ....................... C11
Using C++ standard ..................... C++17
Using ccache ........................... no
Using new DTAGS ........................ yes
Relocatable ............................ yes
Using precompiled headers .............. yes
Using LTCG ............................. no
Target compiler supports:
NEON ................................. yes
Build parts ............................ libs
App store compliance ................... yes
Qt modules and options:
Qt Concurrent .......................... yes
Qt D-Bus ............................... no
Qt D-Bus directly linked to libdbus .... no
Qt Gui ................................. yes
Qt Network ............................. yes
Qt Sql ................................. yes
Qt Testlib ............................. yes
Qt Widgets ............................. yes
Qt Xml ................................. yes
Support enabled for:
Using pkg-config ....................... no
udev ................................... no
Using system zlib ...................... yes
Zstandard support ...................... no
Qt Core:
DoubleConversion ....................... yes
Using system DoubleConversion ........ no
GLib ................................... no
iconv .................................. no
ICU .................................... no
Built-in copy of the MIME database ..... yes
Tracing backend ........................ <none>
Logging backends:
journald ............................. no
syslog ............................... no
slog2 ................................ no
PCRE2 .................................. yes
Using system PCRE2 ................... no
Qt Network:
getifaddrs() ........................... no
IPv6 ifname ............................ no
libproxy ............................... no
Linux AF_NETLINK ....................... no
OpenSSL ................................ no
Qt directly linked to OpenSSL ........ no
OpenSSL 1.1 ............................ no
DTLS ................................... no
OCSP-stapling .......................... no
SCTP ................................... no
Use system proxies ..................... yes
GSSAPI ................................. no
Qt Gui:
Accessibility .......................... yes
FreeType ............................... yes
Using system FreeType ................ no
HarfBuzz ............................... yes
Using system HarfBuzz ................ no
Fontconfig ............................. no
Image formats:
GIF .................................. yes
ICO .................................. yes
JPEG ................................. yes
Using system libjpeg ............... no
PNG .................................. yes
Using system libpng ................ no
Text formats:
HtmlParser ........................... yes
CssParser ............................ yes
OdfWriter ............................ yes
MarkdownReader ....................... yes
Using system libmd4c ............... no
MarkdownWriter ....................... yes
EGL .................................... yes
OpenVG ................................. no
OpenGL:
Desktop OpenGL ....................... no
OpenGL ES 2.0 ........................ yes
OpenGL ES 3.0 ........................ no
OpenGL ES 3.1 ........................ no
OpenGL ES 3.2 ........................ no
Vulkan ................................. yes
Session Management ..................... yes
Features used by QPA backends:
evdev .................................. yes
libinput ............................... no
INTEGRITY HID .......................... no
mtdev .................................. no
tslib .................................. no
xkbcommon .............................. no
X11 specific:
XLib ................................. no
XCB Xlib ............................. no
EGL on X11 ........................... no
xkbcommon-x11 ........................ no
QPA backends:
DirectFB ............................... no
EGLFS .................................. no
LinuxFB ................................ no
VNC .................................... no
Qt Sql:
SQL item models ........................ yes
Qt Widgets:
GTK+ ................................... no
Styles ................................. Fusion Windows Android
Qt PrintSupport:
CUPS ................................... no
Qt Sql Drivers:
DB2 (IBM) .............................. no
InterBase .............................. no
MySql .................................. no
OCI (Oracle) ........................... no
ODBC ................................... no
PostgreSQL ............................. no
SQLite2 ................................ no
SQLite ................................. yes
Using system provided SQLite ......... no
TDS (Sybase) ........................... no
Qt Testlib:
Tester for item models ................. yes
Further Image Formats:
JasPer ................................. no
MNG .................................... no
TIFF ................................... yes
Using system libtiff ................. no
WEBP ................................... yes
Using system libwebp ................. no
Qt QML:
QML network support .................... yes
QML debugging and profiling support .... yes
QML just-in-time compiler .............. yes
QML sequence object .................... yes
QML XML http request ................... yes
QML Locale ............................. yes
Qt QML Models:
QML list model ......................... yes
QML delegate model ..................... yes
Qt Quick:
Direct3D 12 ............................ no
AnimatedImage item ..................... yes
Canvas item ............................ yes
Support for Qt Quick Designer .......... yes
Flipable item .......................... yes
GridView item .......................... yes
ListView item .......................... yes
TableView item ......................... yes
Path support ........................... yes
PathView item .......................... yes
Positioner items ....................... yes
Repeater item .......................... yes
ShaderEffect item ...................... yes
Sprite item ............................ yes
Qt Quick Controls 2:
Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
Hover support .......................... yes
Multi-touch support .................... yes
Qt Multimedia:
ALSA ................................... no
GStreamer 1.0 .......................... no
GStreamer 0.10 ......................... no
Video for Linux ........................ yes
OpenAL ................................. no
PulseAudio ............................. no
Resource Policy (libresourceqt5) ....... no
Windows Audio Services ................. no
DirectShow ............................. no
Windows Media Foundation ............... no
Qt Tools:
Qt Assistant ........................... yes
Qt Designer ............................ yes
Qt Distance Field Generator ............ yes
kmap2qmap .............................. yes
Qt Linguist ............................ yes
Mac Deployment Tool .................... no
makeqpf ................................ yes
pixeltool .............................. yes
qdbus .................................. yes
qev .................................... yes
Qt Attributions Scanner ................ yes
qtdiag ................................. yes
qtpaths ................................ yes
qtplugininfo ........................... yes
Windows deployment tool ................ no
WinRT Runner Tool ...................... no
Qt Tools:
QDoc ................................... no
WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.
Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
On macOS, you can use Homebrew's llvm package.
On Windows, you must set LLVM_INSTALL_DIR to the installation path.
Qt is now configured for building. Just run 'mingw32-make'.
Once everything is built, you must run 'mingw32-make install'.
Qt will be installed into 'E:\Qt\Qt5.15.2\android'.
Prior to reconfiguration, make sure you remove any leftovers from
the previous build.
