[Development] Help needed: Qt 3D Android build issue

[Sean Harmer]

Bump, is anybody able to help here please?

Thanks,

Sean

On Friday 20 May 2016 10:13:51 Sean Harmer wrote:
> Hi,
> 
> Trying to submit a simple patch to Qt 3D we are hitting a weird compilation
> error on Android CI configurations. The change is:
> 
> https://codereview.qt-project.org/#/c/157592/
> 
> and the compilation errors can be seen in full at:
> 
> http://testresults.qt.io/logs/qt/qt3d/489c6abe13e098eb87fa2c0a8639d43dfca8c0
> 2f/LinuxRHEL_6_6x86_64AndroidAndroid_22armv7GCCRelease_DisableTests_OpenGLES
> 2_NoUseGoldLinker/1e29b40895b69af3bcc7f2f8a4b041b69e05b286/buildlog.txt.gz
> 
> but in brief they are:
> 
> In file included from /opt/android/ndk/sources/cxx-stl/gnu-
> libstdc++/4.8/include/atomic:41:0,
>                  from
> /home/qt/work/install/include/QtCore/qatomic_cxx11.h:45, from
> /home/qt/work/install/include/QtCore/qbasicatomic.h:53, from
> /home/qt/work/install/include/QtCore/qatomic.h:46, from
> /home/qt/work/install/include/QtCore/qglobal.h:1145, from
> ../../include/Qt3DCore/../../src/core/qt3dcore_global.h:43,
>                  from ../../include/Qt3DCore/qt3dcore_global.h:1,
>                  from
> ../../include/Qt3DRender/../../src/render/qt3drender_global.h:43,
>                  from ../../include/Qt3DRender/qt3drender_global.h:1,
>                  from
> ../../include/Qt3DRender/5.7.0/Qt3DRender/private/../../../../../src/render/
> backend/backendnode_p.h:54, from
> ../../include/Qt3DRender/5.7.0/Qt3DRender/private/backendnode_p.h:1,
>                  from backend/entity_p.h:55,
>                  from backend/entity.cpp:40:
> /opt/android/ndk/sources/cxx-stl/gnu-libstdc++/4.8/include/bits/atomic_base.
> h: In member function 'virtual void
> Qt3DRender::Render::Entity::sceneChangeEvent(const QSceneChangePtr&)':
> /opt/android/ndk/sources/cxx-stl/gnu-
> libstdc++/4.8/include/bits/atomic_base.h:577:70: error: failure memory model
> cannot be stronger than success memory model for
> '__atomic_compare_exchange' return __atomic_compare_exchange_n(&_M_i,
> &__i1, __i2, 0, __m1, __m2); ^ /opt/android/ndk/sources/cxx-stl/gnu-
> libstdc++/4.8/include/bits/atomic_base.h:577:70: error: failure memory model
> cannot be stronger than success memory model for
> '__atomic_compare_exchange' return __atomic_compare_exchange_n(&_M_i,
> &__i1, __i2, 0, __m1, __m2); ^ /opt/android/ndk/sources/cxx-stl/gnu-
> libstdc++/4.8/include/bits/atomic_base.h:577:70: error: failure memory model
> cannot be stronger than success memory model for
> '__atomic_compare_exchange' return __atomic_compare_exchange_n(&_M_i,
> &__i1, __i2, 0, __m1, __m2); ^ /opt/android/ndk/sources/cxx-stl/gnu-
> libstdc++/4.8/include/bits/atomic_base.h:577:70: error: failure memory model
> cannot be stronger than success memory model for
> '__atomic_compare_exchange' return __atomic_compare_exchange_n(&_M_i,
> &__i1, __i2, 0, __m1, __m2); ^
> /opt/android/ndk/sources/cxx-stl/gnu-libstdc++/4.8/include/bits/atomic_base
> .h: In member function 'virtual void
> Qt3DRender::Render::Entity::initializeFromPeer(const
> QNodeCreatedChangeBasePtr&)':
> /opt/android/ndk/sources/cxx-stl/gnu-
> libstdc++/4.8/include/bits/atomic_base.h:577:70: error: failure memory model
> cannot be stronger than success memory model for
> '__atomic_compare_exchange' return __atomic_compare_exchange_n(&_M_i,
> &__i1, __i2, 0, __m1, __m2); ^
> 
> The patch makes no direct use of atomics, only via QSharedPointer. BogDan
> reports that it builds fine with latest NDK.
> 
> Is this a genuine error on our part or some corner case issue with the CI's
> installed NDK?
> 
> I'm at a total loss with this one and have no idea how to investigate/fix.
> 
> Any help would be greatly appreciated. :)
> 
> Kind regards,
> 
> Sean
> --
> Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
> Klarälvdalens Datakonsult AB, a KDAB Group company
> Tel. UK +44 (0)1625 809908, Sweden (HQ) +46-563-540090
> KDAB - Qt Experts - Platform-independent software solutions
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-- 
Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
KDAB (UK) Ltd, a KDAB Group company
Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
Mobile: +44 (0)7545 140604
KDAB - Qt Experts