[Development] CI is suffering from problems

[Ulf Hermann]

> You have probably already noticed this, but here’s an email notifying
> you that we’re on it. Our OpenNebula isn’t able to clone any new virtual
> machines, complaining that the disk is full even though it isn’t. As
> said…we continue investigating.

In addition to that we suddenly get failures when compiling QtCore and 
QtNetwork, even if nothing has changed there:

>  Module "qt/qtbase" (9ec8da01004481027df83361b998b24c63ab5a6d) The make execution failed. The CI rejected the staged commits due to the beforementioned reason. Possible reason could be flakiness in the system, but could also be a bug in one of the commits.:
>  /home/qt/work/qt/qtbase/src/corelib/global/qfloat16_f16c.c:61: undefined reference to `_mm256_cvtps_ph'
>  /home/qt/work/qt/qtbase/src/corelib/global/qfloat16_f16c.c:76: undefined reference to `_mm256_cvtph_ps'
>  Makefile:1152: recipe for target '../../lib/libQt5Core.so.5.11.0' failed
>  make[2]: *** [../../lib/libQt5Core.so.5.11.0] Error 1
>  make[1]: *** [sub-corelib-make_first] Error 2
>  make: *** [sub-src-make_first] Error 2

and

> Module "qt/qtbase" (99b12531013516c060eed60157f8b0be5eafa1e5) The make execution failed. The CI rejected the staged commits due to the beforementioned reason. Possible reason could be flakiness in the system, but could also be a bug in one of the commits.:
>  /opt/yocto-armv7/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++ -c -include .pch/Qt5Network -pipe -march=armv7-a -mfpu=neon -DLINUX=1 -mfloat-abi=hard --sysroot=/opt/yocto-armv7/sysroots/armv7ahf-neon-poky-linux-gnueabi -g -std=c++1z -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Werror -Wno-error=cpp -Wno-error=deprecated-declarations -Wno-error=strict-overflow -D_REENTRANT -fPIC -DQT_NO_USING_NAMESPACE -DQT_NO_FOREACH -DQT_USE_SYSTEM_PROXIES -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_NETWORK_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_CORE_LIB -I. -Ikernel -I../../include -I../../include/QtNetwork -I../../include/QtNetwork/5.11.0 -I../../include/QtNetw
>  ork/5.11.0/QtNetwork -I../../include/QtCore/5.11.0 -I../../include/QtCore/5.11.0/QtCore -I../../include/QtCore -I.moc -I../../mkspecs/devices/linux-imx7-g++ -o .obj/qnetworkinterface_linux.o kernel/qnetworkinterface_linux.cpp
>  kernel/qnetworkinterface_linux.cpp: In instantiation of ‘void {anonymous}::ProcessNetlinkRequest<Lambda>::operator()(int, nlmsghdr*, char*, size_t, Lambda&&) [with Lambda = getInterfaces(int, char*)::<lambda(ifinfomsg*, size_t)>; size_t = unsigned int]’:
>  kernel/qnetworkinterface_linux.cpp:216:36:   required from ‘void {anonymous}::processNetlinkRequest(int, nlmsghdr*, char*, size_t, Lambda&&) [with Lambda = getInterfaces(int, char*)::<lambda(ifinfomsg*, size_t)>; size_t = unsigned int]’
>  kernel/qnetworkinterface_linux.cpp:319:6:   required from here
>  kernel/qnetworkinterface_linux.cpp:161:48: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
>  kernel/qnetworkinterface_linux.cpp: In instantiation of ‘void {anonymous}::ProcessNetlinkRequest<Lambda>::operator()(int, nlmsghdr*, char*, size_t, Lambda&&) [with Lambda = getAddresses(int, char*, QList<QNetworkInterfacePrivate*>&)::<lambda(ifaddrmsg*, size_t)>; size_t = unsigned int]’:
>  kernel/qnetworkinterface_linux.cpp:216:36:   required from ‘void {anonymous}::processNetlinkRequest(int, nlmsghdr*, char*, size_t, Lambda&&) [with Lambda = getAddresses(int, char*, QList<QNetworkInterfacePrivate*>&)::<lambda(ifaddrmsg*, size_t)>; size_t = unsigned int]’
>  kernel/qnetworkinterface_linux.cpp:423:6:   required from here
>  kernel/qnetworkinterface_linux.cpp:161:48: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
>  Makefile:26401: recipe for target '.obj/qnetworkinterface_linux.o' failed
>  make[2]: *** [.obj/qnetworkinterface_linux.o] Error 1
>  make[1]: *** [sub-network-make_first] Error 2
>  make: *** [sub-src-make_first] Error 2

I guess in the first case the system headers changed and in the second 
case the compiler changed. Do you actually test machine configuration 
changes against the current state of Qt before you switch them live? I 
think that should be done and any fixes to Qt for the new configuration 
should be applied before the configuration goes live.

br,
Ulf