error: cannot find -lc++ qt 5.12 android

AriosJentu

Have almost the same trouble. After some system updates (Manjaro), it won't run on my any android devices. Crashing with error that cannot found linker -lc++

02:46:40: Running steps for project Calendar...
02:46:40: Configuration unchanged, skipping qmake step.
02:46:40: Starting: "/opt/android-ndk/prebuilt/linux-x86_64/bin/make" -j4
/opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -D__ANDROID_API__=22 -target aarch64-none-linux-android -gcc-toolchain /opt/android-ndk/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a --sysroot=/opt/android-ndk/platforms/android-22/arch-arm64/ -Wl,-soname,libCalendar.so -Wl,-rpath=/opt/android-libs/aarch64/lib -Wl,--no-undefined -Wl,-z,noexecstack -shared -o libCalendar.so event.o eventmodel.o main.o qrc_resources.o moc_event.o moc_eventmodel.o   -L/opt/android-libs/aarch64/lib -lQt5Quick -L/opt/android-ndk/sources/cxx-stl/llvm-libc++/libs/arm64-v8a -lQt5Gui -lQt5Qml -lQt5Network -lQt5Sql -lQt5Core /opt/android-ndk/platforms/android-22/arch-arm64/usr/lib/libGLESv2.so  -L/opt/android-ndk/sources/cxx-stl/llvm-libc++/libs/arm64-v8a /opt/android-ndk/sources/cxx-stl/llvm-libc++/libs/arm64-v8a/libc++.so.22 -llog -lz -lm -ldl -lc
/opt/android-ndk/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lc++
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libCalendar.so] Error 1
02:46:40: The process "/opt/android-ndk/prebuilt/linux-x86_64/bin/make" exited with code 2.
Error while building/deploying project Calendar (kit: Android)
When executing step "Make"
02:46:40: Elapsed time: 00:00.

SDK is 26.1.1, NDK is 20.0.5594570.

Woazim

I had the same issue with NDK 20. What worked for me was to download NDK r19c (here : https://developer.android.com/ndk/downloads/older_releases) and configure QtCreator to use it in Tools/Options/Devices.

AriosJentu

For me fixed reinstalling (updating) next packages -> android-aarch64-qt5 and android-armv7a-eabi-qt5 with editing their PKGBUILDs and disabling packages for build tools and platform tools.

GarineaudDylan

I have the same problem and I don't know how to resolve it. I had already done all your issues and don't works...

NoWhereMan1979

@Woazim thanks, i used your advise and it worked.

Albertino

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

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

BeMind

@Albertino solution Works!!! :) Thank you.

alepez

@Albertino solution works for me (Qt 5.12.3)

ignusin

@Albertino thank you Sir, you just saved my day (night to be honest).

rch_shukla

@Albertino @AriosJentu Hello , I am getting while deploying 5.10 project into QT 5.13. It is perfectly deploying for windows but for android unable to deploy i have already tried all available solutions but nothing is working out for me.
This is my error-
clang++.exe: error: no such file or directory: 'c:\Utils\Android\android-ndk-r19c/sources/cxx-stl/llvm-libc++/libs/arm64-v8a/libc++.so.21'
make: *** [libMNSBLauncher.so] Error 1
12:26:15: The process "C:\Android\android-ndk-r19c\prebuilt\windows-x86_64\bin\make.exe" exited with code 2.
Error while building/deploying project mobilauncher (kit: Android for arm64-v8a (Clang Qt 5.13.0 for Android ARM64-v8a))
When executing step "Make" 😢

mzelina

@Albertino thank you!

trousev

You also can write this into your own qmake file, not into system one. To be precise, just add into your project's .pro the following:

QMAKE_LINK += -nostdlib++

and that's it

Albertino

This post is deleted!

Albertino

@trousev said in error: cannot find -lc++ qt 5.12 android:

QMAKE_LINK += -nostdlib++

Oh nice to know, thanks

deleted510

@albertino THANK YOU! WOOORKS!!!!

RickF

@trousev What's the underlying problem this solves? It works for me but why? Thx.

bogong

@albertino said in error: cannot find -lc++ qt 5.12 android:

https://codereview.qt-project.org/c/qt/qtbase/+/264903/9/mkspecs/android-clang/qmake.conf#34

Solution works on 5.12.4

DonLakeFlyer

@rickf I'd like to know the same thing. Is this just a workaround or the correct setup?

BTSTOnline

@trousev said in error: cannot find -lc++ qt 5.12 android:

You also can write this into your own qmake file, not into system one. To be precise, just add into your project's .pro the following:
QMAKE_LINK += -nostdlib++
and that's it

Worked for me!

Markus Goetz53

FYI If this is https://bugreports.qt.io/browse/QTBUG-70631, it's claimed to be fixed with 5.12.5 and 5.13.0