error: expected '{' before '_GLIBCXX_VISIBILITY' namespace std _GLIBCXX_VISIBILITY(default) - qt

I am using pre-compiled Qt 5.2.1 for Android Application in Windows 7-64 bit. I am not able to build a simple Hello World program on cpu armeabi-v7a.I am using android_armv7 compiler.
Earlier I was getting this error- error: bits/c++config.h: No such file or directory
Then I added the below path to my .pro file-
INCLUDEPATH += C:/android-ndk-r9d-windows-x86_64/android-ndk-r9d/sources/cxx-stl/gnu-libstdc++/4.8/include \ + C:\QtMobile\Tools\mingw48_32\lib\gcc\i686-w64-mingw32\4.8.0\include\c++\i686-w64-mingw32
Now,I am getting the below error-
C:\android-ndk-r9d-windows-x86_64\android-ndk-r9d\sources\cxx-stl\gnu-libstdc++\4.8\include\bits\stl_relops.h:67: error: expected '{' before '_GLIBCXX_VISIBILITY'
namespace std _GLIBCXX_VISIBILITY(default)
I tried to search everywhere but I am not getting the solution.Please help me out.

I got the solution.It was the problem of ndk version.But if I am using Qt Creator 5.2.1 for API 19,I am not able to deploy it on the device.For API 18 its working well.. Thank you. :)

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error: cannot find -lc++ clang++: error: linker command failed with exit code 1

I'm having no luck running the Qt examples with Qt Creator. I've tried three so far, but I have been unable to build and run any of them.
and also it showing as QML module not found for QtQuickVirtualKeyboard import.
i have attached the error screenshot.
error: cannot find -lc++
clang++: error: linker command failed with exit code 1
The error: cannot find -lc++ using ndk r20 can be solved like this:
https://codereview.qt-project.org/c/qt/qtbase/+/264903/9/mkspecs/android-clang/qmake.conf#34][1]
For example to compile for android armv7 ndk r20, locate the file:
C:\Qt\5.13.0\android_armv7\mkspecs\android-clang\qmake.conf
and add the missing -nostdlib++
for android x86 (i use this for emulator), locate the file:
C:\Qt\5.13.0\android_x86\mkspecs\android-clang\qmake.conf

QT can't build - "Some of the required modules (!win32-g++) are not available"

I pulled down the qtpdf repository to check out and play with from here:
http://code.qt.io/cgit/qt-labs/qtpdf.git
As soon as I open the qtpdf.pro file, I get the following general messages:
Cannot read C:/.../build-qpdf-Desktop_Qt_5_10_0_MinGW_32bit-Debug/src/lib/pdfium.pri: No such file or directory
Cannot read C:/.../build-qpdf-Desktop_Qt_5_10_0_MinGW_32bit-Debug/src/lib/freetype.pri: No such file or directory
Project MESSAGE: perl -w C:\Qt\5.10.0\mingw53_32\bin\syncqt.pl -module QtPdf -version 5.9.0 -outdir "C:/.../build-qpdf-Desktop_Qt_5_10_0_MinGW_32bit-Debug" C:/.../qtpdf
Project MESSAGE: perl -w C:\Qt\5.10.0\mingw53_32\bin\syncqt.pl -module QtPdfWidgets -version 5.9.0 -outdir "C:/.../build-qpdf-Desktop_Qt_5_10_0_MinGW_32bit-Debug" C:/.../qtpdf
Project ERROR: Unknown module(s) in QT: pdfwidgets
Project ERROR: Unknown module(s) in QT: pdf
Also when running "rebuild all" I get the following error message:
16:15:33: Starting: "C:\Qt\Tools\mingw530_32\bin\mingw32-make.exe" qmake_all
"Some of the required modules (!qnx:!uikit:!winphone:!winrt:!win32-g++:!integrity) are not available."
"Skipped."
I've narrowed this down to !win32-g++ - If I remove that, it won't throw that error, but I don't understand what exactly this error means - I have googled around a lot but couldn't find anything that seemed reminiscent of this particular problem.
I managed to build qtpdf with mingw provided with Qt5.11.2.
Comment out "requires(!qnx:!uikit:!winphone:!winrt:!win32-g++:!integrity)" from pdf.pro
Apply the patch found here : https://github.com/Alexpux/MINGW-packages/blob/master/mingw-w64-pdfium-git/pdfium-2729.patch (link dead in 2021, no backup sorry)
Add -luuid after "win32: LIBS_PRIVATE += -ladvapi32 -lgdi32 -luser32" in lib.pro
I don't know why, probably because I am not an expert, but mingw doesn't generate correctly the folder "include". As a workaround I use the one generated under linux. For some reason, mingw generate only QPdfDepends and QPdfWidgetsDepends, none of the needed headers are generated. I didn't dig because I am lazy.
Hope it helps !
# Upstream PDFium has not been ported to various platforms yet.
requires(!qnx:!uikit:!winphone:!winrt:!win32-g++:!integrity)
The module is not working on win32-g++ (mingw32).

basic_client which is built with Makefile BusAttachment::Connect failed

I just built standard core 15.09a on linux and run sample apps basic_client.
This one built by scons.
bin/samples/basic_client works fine.
However, I built cpp/samples/basic/basic_client with Makefile.
It does not work. It shows an error
"0.232 ****** ERROR ALLJOYN external ...e/src/BusAttachment.cc:560 | BusAttachment::Connect failed: ER_OS_ERROR
BusAttachment::Connect('') failed.".
So, I launched the bin/allhoyn-daemon, then no error occurred.
What is difference between scon and Makefile version?
Additionally, where can I get the information of application under the bin directory?
I searched the web-site of AllSeen and couldn't find any info.
As i know, the error that you got when build with Makefile happens because basic_client hasn't alljoyn router inside, with scons it runs fine because it compiles with BR=on and some flags:
-lajrouter -lBundledRouter.o -lssl -lcrypto
For more infomation, visit: here

v-play installation - Cant deploy on desktop and device

I’ve just installed v-play but when i compile to desktop i get error :-1: error: cannot find -lGL and exits.
Then if i compile to android it will compile and install but the it never successfully opens the app and it exits on deployment.
These are the warnings i get :
Warnings while parsing QML type information of /home/theguy/V-Play/5.5/android_armv5/qml/QtCanvas3D:
/home/theguy/V-Play/5.5/android_armv5/qml/QtCanvas3D/plugins.qmltypes:1:24: Reading only version 1.1 parts.
/home/theguy/V-Play/5.5/android_armv5/qml/QtCanvas3D/plugins.qmltypes:10:5: Expected only Component and ModuleApi object definitions.
Warnings while parsing QML type information of /home/theguy/V-Play/5.5/gcc_64/qml/QtWebSockets:
/home/theguy/V-Play/5.5/gcc_64/qml/QtWebSockets/plugins.qmltypes:1:24: Reading only version 1.1 parts.
/home/theguy/V-Play/5.5/gcc_64/qml/QtWebSockets/plugins.qmltypes:10:5: Expected only Component and ModuleApi object definitions.
Warnings while parsing QML type information of /home/theguy/V-Play/5.5/gcc_64/qml/QtCanvas3D:
/home/theguy/V-Play/5.5/gcc_64/qml/QtCanvas3D/plugins.qmltypes:1:24: Reading only version 1.1 parts.
/home/theguy/V-Play/5.5/gcc_64/qml/QtCanvas3D/plugins.qmltypes:10:5: Expected only Component and ModuleApi object definitions.
And these are the compile issues I get:
15:03:42: Packaging error: Command “/home/theguy/Android/Sdk/platform-tools/adb -s 9cc172fdedea pull /system/bin/sh: readlink: not found /home/theguy/Desktop/Projects/v-play/ConverseLanguages/build-ConverseLanguages-Android_for_armeabi_GCC_4_9_Qt_5_5_0-Release/app_process” failed.Exit code: 1
15:03:42: Package deploy: Failed to pull “/system/bin/sh: readlink: not found” to “/home/theguy/Desktop/Projects/v-play/ConverseLanguages/build-ConverseLanguages-Android_for_armeabi_GCC_4_9_Qt_5_5_0-Release/app_process”.
15:03:42: Package deploy: Running command “/home/theguy/Android/Sdk/platform-tools/adb -s 9cc172fdedea pull /system/lib/libc.so /home/theguy/Desktop/Projects/v-play/ConverseLanguages/build-ConverseLanguages-Android_for_armeabi_GCC_4_9_Qt_5_5_0-Release/libc.so”.
Error while building/deploying project ConverseLanguages (kit: Android for armeabi (GCC 4.9, Qt 5.5.0))
When executing step “Deploy to Android device”
please see here for a reply: https://v-play.net/developers/forums/t/installation-problem-error-cannot-find-lgl/
Cheers, Chris

New Static Library has build error "libtool exited with code 1"

I created a new static library in my iOS project and now I'm getting the build error
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool failed with exit code 1
How do I go about debugging this?
To see the actual output and not just the error message, try building your target or scheme with xcodebuild from command line.
I had a problem with the same error message. In my case, I couldn't build for the simulator, but it worked find when building for the device. The output from xcodebuild confirmed that Xcode could not set the proper architecture to build for the simulator.
Long story short, it turned out that one build setting was corrupted. The Mach-O Type setting in the Linking category was set to Relocatable Object File for some reason. I switched it back to Static Library and the error disappeared.

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