cannot find -lc++ when build android project

Dunphy · wrote on 5 Sept 2019, 10:23

Hi guys, here's my Environment:

OS: MacOS 10.14.6
QT: 5.13.0
JDK: 1.8.0_221, x86_64 "Java SE 8"
NDK: android-ndk-r20
Android SDK: Android Studio 3.5 and updated SDK tools

kit setting:

When I followed Creating a Mobile Application, the build was failed with error log:

18:10:37: Running steps for project android_test...
18:10:37: Starting: "/Users/oc/Qt5.13.0/5.13.0/android_armv7/bin/qmake" /Users/oc/work/temp/android_test/android_test.pro -spec android-clang CONFIG+=debug CONFIG+=qml_debug
Info: creating stash file /Users/oc/work/temp/build-android_test-Android_for_armeabi_v7a_Clang_Qt_5_13_0_for_Android_ARMv7-Debug/.qmake.stash
../android_test/qml.qrc: Warning: potential duplicate alias detected: 'main.qml'
18:10:37: The process "/Users/oc/Qt5.13.0/5.13.0/android_armv7/bin/qmake" exited normally.
18:10:37: Starting: "/Users/oc/android-ndk-r20/prebuilt/darwin-x86_64/bin/make" -f /Users/oc/work/temp/build-android_test-Android_for_armeabi_v7a_Clang_Qt_5_13_0_for_Android_ARMv7-Debug/Makefile qmake_all
make: Nothing to be done for `qmake_all'.
18:10:37: The process "/Users/oc/android-ndk-r20/prebuilt/darwin-x86_64/bin/make" exited normally.
18:10:37: Starting: "/Users/oc/android-ndk-r20/prebuilt/darwin-x86_64/bin/make" -j8
/Users/oc/android-ndk-r20/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ -c -D__ANDROID_API__=21 -target armv7-none-linux-androideabi -gcc-toolchain /Users/oc/android-ndk-r20/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64 -fno-limit-debug-info -DANDROID_HAS_WSTRING --sysroot=/Users/oc/android-ndk-r20/sysroot -isystem /Users/oc/android-ndk-r20/sysroot/usr/include/arm-linux-androideabi -isystem /Users/oc/android-ndk-r20/sources/cxx-stl/llvm-libc++/include -isystem /Users/oc/android-ndk-r20/sources/android/support/include -isystem /Users/oc/android-ndk-r20/sources/cxx-stl/llvm-libc++abi/include -fstack-protector-strong -DANDROID -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -fno-builtin-memmove -g -g -marm -O0 -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../android_test -I. -I../../../Qt5.13.0/5.13.0/android_armv7/include -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtQuick -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtGui -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtQml -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtNetwork -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtCore -I. -I../../../Qt5.13.0/5.13.0/android_armv7/mkspecs/android-clang -o main.o ../android_test/main.cpp
/Users/oc/Qt5.13.0/5.13.0/android_armv7/bin/rcc -name qml ../android_test/qml.qrc -o qrc_qml.cpp
../android_test/qml.qrc: Warning: potential duplicate alias detected: 'main.qml'
/Users/oc/android-ndk-r20/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ -c -D__ANDROID_API__=21 -target armv7-none-linux-androideabi -gcc-toolchain /Users/oc/android-ndk-r20/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64 -fno-limit-debug-info -DANDROID_HAS_WSTRING --sysroot=/Users/oc/android-ndk-r20/sysroot -isystem /Users/oc/android-ndk-r20/sysroot/usr/include/arm-linux-androideabi -isystem /Users/oc/android-ndk-r20/sources/cxx-stl/llvm-libc++/include -isystem /Users/oc/android-ndk-r20/sources/android/support/include -isystem /Users/oc/android-ndk-r20/sources/cxx-stl/llvm-libc++abi/include -fstack-protector-strong -DANDROID -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -fno-builtin-memmove -g -g -marm -O0 -std=gnu++11 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../android_test -I. -I../../../Qt5.13.0/5.13.0/android_armv7/include -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtQuick -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtGui -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtQml -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtNetwork -I../../../Qt5.13.0/5.13.0/android_armv7/include/QtCore -I. -I../../../Qt5.13.0/5.13.0/android_armv7/mkspecs/android-clang -o qrc_qml.o qrc_qml.cpp
/Users/oc/android-ndk-r20/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ -D__ANDROID_API__=21 -target armv7-none-linux-androideabi -gcc-toolchain /Users/oc/android-ndk-r20/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -Wl,--exclude-libs,libunwind.a --sysroot=/Users/oc/android-ndk-r20/platforms/android-21/arch-arm/ -Wl,-soname,libandroid_test.so -Wl,-rpath=/Users/oc/Qt5.13.0/5.13.0/android_armv7/lib -Wl,--no-undefined -Wl,-z,noexecstack -shared -o libandroid_test.so main.o qrc_qml.o   /Users/oc/Qt5.13.0/5.13.0/android_armv7/lib/libQt5Quick.so -L/opt/android/android-ndk-r19c/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a /Users/oc/Qt5.13.0/5.13.0/android_armv7/lib/libQt5Gui.so /Users/oc/Qt5.13.0/5.13.0/android_armv7/lib/libQt5Qml.so /Users/oc/Qt5.13.0/5.13.0/android_armv7/lib/libQt5Network.so /Users/oc/Qt5.13.0/5.13.0/android_armv7/lib/libQt5Core.so -lGLESv2  -L/Users/oc/android-ndk-r20/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a /Users/oc/android-ndk-r20/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++.so.21 -llog -lz -lm -ldl -lc
/Users/oc/android-ndk-r20/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lc++
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libandroid_test.so] Error 1
18:10:38: The process "/Users/oc/android-ndk-r20/prebuilt/darwin-x86_64/bin/make" exited with code 2.
Error while building/deploying project android_test (kit: Android for armeabi-v7a (Clang Qt 5.13.0 for Android ARMv7))
When executing step "Make"

I don't know if I make the NDK right, cause I never see NDK with android-clang toolchain from android-getting-started.

Any advice would be appriciated!

sierdzio · wrote on 5 Sept 2019, 13:09

See https://forum.qt.io/topic/101322/what-s-the-problem-android-compile-error

Dunphy · wrote on 6 Sept 2019, 01:34

Thanks a lot! That's the solution~

@albertino said in What's the problem? android compile error:

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

For error: Execution failed for task ':compileDebugAidl'
locate the file on your build directory, mine is: C:\dev_qt\experiments\build-test_qt_5_13_0_ARMv7-Release\android-build\gradle.properties and change androidBuildToolsVersion
from: androidBuildToolsVersion=29.0.0
to: androidBuildToolsVersion=28.0.3