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  4. error: cannot find -lc++ qt 5.12 android
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error: cannot find -lc++ qt 5.12 android

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  • T Offline
    T Offline
    trousev
    wrote on last edited by
    #14

    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

    A R B 4 Replies Last reply
    7
    • T 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

      A Offline
      A Offline
      Albertino
      wrote on last edited by
      #15
      This post is deleted!
      1 Reply Last reply
      0
      • T 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

        A Offline
        A Offline
        Albertino
        wrote on last edited by
        #16

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

        QMAKE_LINK += -nostdlib++

        Oh nice to know, thanks

        1 Reply Last reply
        0
        • A 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

          D Offline
          D Offline
          deleted510
          wrote on last edited by
          #17

          @albertino THANK YOU! WOOORKS!!!!

          1 Reply Last reply
          0
          • T 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

            R Offline
            R Offline
            RickF
            wrote on last edited by
            #18

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

            D 1 Reply Last reply
            0
            • B Offline
              B Offline
              bogong
              wrote on last edited by
              #19

              @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

              1 Reply Last reply
              0
              • R RickF

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

                D Offline
                D Offline
                DonLakeFlyer
                wrote on last edited by
                #20

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

                1 Reply Last reply
                0
                • T 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

                  B Offline
                  B Offline
                  BTSTOnline
                  wrote on last edited by
                  #21

                  @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!

                  1 Reply Last reply
                  0
                  • M Offline
                    M Offline
                    Markus Goetz53
                    wrote on last edited by
                    #22

                    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

                    1 Reply Last reply
                    2
                    • G Offline
                      G Offline
                      Gourmet
                      wrote on last edited by Gourmet
                      #23

                      Just installed Qt 5.12.5 and checked - this option is already in qmake.config files for all android branches.

                      Topic starter can change this topic to SOLVED.

                      1 Reply Last reply
                      0
                      • A 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

                        S Offline
                        S Offline
                        Swapnil Ashok Desai
                        wrote on last edited by
                        #24

                        @Albertino thanks it worked

                        1 Reply Last reply
                        0
                        • A 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.

                          L Offline
                          L Offline
                          liudongya
                          wrote on last edited by
                          #25

                          @AriosJentu I had the same problem, how did you solve it

                          1 Reply Last reply
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