building qt 5.9 on windows for android results in 'ERROR: Cannot detect Android NDK toolchain'

deveLoper5122

I followed the build instructions from here :
https://wiki.qt.io/Building_qt-android_on_windows

and created my bat file to ease the operation

set "MINGW_BUILDS_ROOT=C:\mingw64"
set "JDK_ROOT=E:\programs\AndStdio\jre"
set "ANDROID_NDK_PATH=E:\programs\AndNdk"
set "ANDROID_SDK_PATH=E:\programs\AndSdk2"
set "ANDROID_API_VERSION=android-21"
set "ANDROID_SDK_ROOT=%ANDROID_SDK_PATH%"
set "ANDROID_TARGET_ARCH=armeabi-v7a"
set "ANDROID_BUILD_TOOLS_REVISION=21.1.2"
set "ANDROID_TOOLCHAIN_VERSION=4.9"
set "ANDROID_NDK_HOST=windows-x86_64"
set "PATH=%MINGW_BUILDS_ROOT%\bin;%PATH%"
configure.bat -developer-build -platform win32-g++ -opengl es2 -xplatform android-g++ -android-ndk ANDROID_NDK_PATH -android-sdk ANDROID_SDK_ROOT -opensource -confirm-license -nomake tests -nomake examples -prefix E:\qt-android

but I got :

Bootstrapping qmake ...
mingw32-make: Nothing to be done for 'first'.
ERROR: Cannot detect Android NDK toolchain.
Please use -android-toolchain-version to specify it.

I'm using android-ndk-r17b-windows-x86_64 downloaded from https://dl.google.com/android/repository/android-ndk-r17b-windows-x86_64.zip and can successfully build android apps with visualgdb in visual studio

SGaist

Hi and welcome to devnet,

Please also take a look at this wiki entry linked from Qt's documentation. You should try with NDK r10. The more recent versions proven problematic as explained there.

You might have success with r17 with a more recent version of Qt.

deveLoper5122

but what are the more recent versions , I'm currently using qt 5.9
I'll try with ndk r10 and post the result

deveLoper5122

the same problem with ndk 10
this is my bat file :

@echo off
set "MINGW_BUILDS_ROOT=C:\mingw64"
set "JDK_ROOT=E:\programs\AndStdio\jre"
set "ANDROID_NDK_PATH=E:\programs\NDK10"
set "ANDROID_SDK_PATH=E:\programs\AndSdk2"
set "ANDROID_API_VERSION=android-21"
set "ANDROID_SDK_ROOT=%ANDROID_SDK_PATH%"
set "ANDROID_TARGET_ARCH=armeabi-v7a"
set "ANDROID_BUILD_TOOLS_REVISION=21.1.2"
set "ANDROID_TOOLCHAIN_VERSION=4.9"
set "ANDROID_NDK_HOST=windows-x86_64"
set "PATH=%MINGW_BUILDS_ROOT%\bin;%PATH%"
configure.bat -developer-build -platform win32-g++ -opengl es2 -xplatform android-g++ -android-ndk ANDROID_NDK_PATH -android-toolchain-version 4.9 -android-sdk ANDROID_SDK_ROOT -opensource -confirm-license -nomake tests -nomake examples -prefix E:\qt-android

and the output is :

Bootstrapping qmake ...
mingw32-make: Nothing to be done for 'first'.
ERROR: Cannot detect Android NDK toolchain.
Please use -android-toolchain-version to specify it.

SGaist

Out of curiosity, why not use a pre-built version ?

You can make the configure script more verbose adding the -v option.

deveLoper5122

the problem was in this : "-android-ndk ANDROID_NDK_PATH" I had to provide the full path or use %ANDROID_NDK_PATH% as the string was passed as it is not as an environment variable
I think the error should be : can't find ndk path

SGaist

So you succeed building Qt ?

deveLoper5122

I now started the build with mingw32-make and the build will take some time

deveLoper5122

got this error during build

E:/programs/NDK10/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-g++ -c -D__ANDROID_API__=16 --sysroot=E:/programs/NDK10/platforms/android-16/arch-arm/ -isystem E:/programs/NDK10/sources/cxx-stl/gnu-libstdc++/4.9/include -isystem E:/programs/NDK10/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include -fstack-protector-strong -DANDROID -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -fno-builtin-memmove -g -g -marm -O0 -fPIC -std=c++14 -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -Werror -Wno-error=cpp -Wno-error=deprecated-declarations -Wno-error=strict-overflow -Wno-error=literal-suffix -D_REENTRANT -DQT_NO_CAST_FROM_ASCII -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_FONTDATABASE_SUPPORT_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -DQT_GUI_LIB -DQT_CORE_LIB -I. -I../../../include -I../../../include/QtFontDatabaseSupport -I../../../include/QtFontDatabaseSupport/5.9.2 -I../../../include/QtFontDatabaseSupport/5.9.2/QtFontDatabaseSupport -I../../../include/QtGui/5.9.2 -I../../../include/QtGui/5.9.2/QtGui -I../../../include/QtCore/5.9.2 -I../../../include/QtCore/5.9.2/QtCore -I../../../include/QtGui -I../../../include/QtCore -I.moc -I../../3rdparty/freetype/include -I../../../mkspecs/android-g++ -o .obj/qfreetypefontdatabase.obj freetype/qfreetypefontdatabase.cpp
In file included from freetype/qfreetypefontdatabase.cpp:51:0:
 ../../../include/QtFontDatabaseSupport/5.9.2/QtFontDatabaseSupport/private/qfontengine_ft_p.h:1:88: fatal error: ../../../../../src/platformsupport/fontdatabases/freetype/qfontengine_ft_p.h: No such file or directory
#include "../../../../../src/platformsupport/fontdatabases/freetype/qfontengine_ft_p.h"
                                                                                    ^
compilation terminated.

SGaist

Did you check if you have that file somewhere ?

deveLoper5122

@deveLoper5122 said in building qt 5.9 on windows for android results in 'ERROR: Cannot detect Android NDK toolchain':

qfontengine_ft_p

I have it in E:\qt-android-source\qt-everywhere-opensource-src-5.9.2\qt-everywhere-opensource-src-5.9.2\qtbase\src\platformsupport\fontdatabases\freetype

but don't know why the compiler didn't resolve it

SGaist

That's a pretty long path for not much benefit.

I'd recommend shortening it and also make an out of source build.

deveLoper5122

I can't change the dir now after I started building , I had to rebuild from scratch again right ?

SGaist

Yes, that's correct.

deveLoper5122

I could change the dir with a symbol link to qt base and resumed the build again

deveLoper5122

but now I got :

javac -source 6 -target 6 -Xlint:unchecked -bootclasspath E:/programs/AndSdk2/platforms/android-25/android.jar -cp 'E:\qt-android-source\qt-5.9.2\qt-5.9.2\qtbase\src\android\jar\src\;E:\programs\AndSdk2\platforms\android-25\android.jar' -d .classes.bundled src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java src/org/qtproject/qt5/android/accessibility/QtNativeAccessibility.java src/org/qtproject/qt5/android/QtActivityDelegate.java src/org/qtproject/qt5/android/QtEditText.java src/org/qtproject/qt5/android/QtInputConnection.java src/org/qtproject/qt5/android/QtLayout.java src/org/qtproject/qt5/android/QtMessageDialogHelper.java src/org/qtproject/qt5/android/QtNative.java src/org/qtproject/qt5/android/QtNativeLibrariesDir.java src/org/qtproject/qt5/android/QtSurface.java src/org/qtproject/qt5/android/ExtractStyle.java src/org/qtproject/qt5/android/EditMenu.java src/org/qtproject/qt5/android/EditPopupMenu.java src/org/qtproject/qt5/android/CursorHandle.java
process_begin: CreateProcess(NULL, javac -source 6 -target 6 -Xlint:unchecked -bootclasspath E:/programs/AndSdk2/platforms/android-25/android.jar -cp E:\qt-android-source\qt-5.9.2\qt-5.9.2\qtbase\src\android\jar\src\;E:\programs\AndSdk2\platforms\android-25\android.jar -d .classes.bundled src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java src/org/qtproject/qt5/android/accessibility/QtNativeAccessibility.java src/org/qtproject/qt5/android/QtActivityDelegate.java src/org/qtproject/qt5/android/QtEditText.java src/org/qtproject/qt5/android/QtInputConnection.java src/org/qtproject/qt5/android/QtLayout.java src/org/qtproject/qt5/android/QtMessageDialogHelper.java src/org/qtproject/qt5/android/QtNative.java src/org/qtproject/qt5/android/QtNativeLibrariesDir.java src/org/qtproject/qt5/android/QtSurface.java src/org/qtproject/qt5/android/ExtractStyle.java src/org/qtproject/qt5/android/EditMenu.java src/org/qtproject/qt5/android/EditPopupMenu.java src/org/qtproject/qt5/android/CursorHandle.java, ...) failed.
make (e=2): The system cannot find the file specified.

deveLoper5122

the file exists but the javac doesn't seem to be redircted with the symbol link so I have to restart the whole build with a shorter path