[Development] Strange behavior on 5.12 branch and moc genrated file ( KDE application )

[Liang Qi]

Perhaps it's related with https://codereview.qt-project.org/#/c/235352/ .

--Liang

On Wed, 5 Sep 2018 at 09:20, Helio Chissini de Castro <helio at kde.org> wrote:

> Morning guys
>
> After compile 5.12 branch from yesterday morning, i got one KDE
> application failing due a compiler error on a generated moc file.
> Is there any moc relevant change ? I didn't change my compiler environment
> from previous 5.11 and always compile all in a clean chroot, with no
> previous versions installed.
> Qt itself was build with clang 6.0.1
>
> Here's the logs
>
> With gcc 8.1.1 x86_64:
>
> In file included from
> /code/kde/src/frameworks/kcoreaddons/autotests/jsonplugin2.cpp:23:
> /code/kde/src/frameworks/kcoreaddons/src/lib/plugin/kpluginfactory.h: In
> member function ‘void KPluginFactory::registerPlugin(const QString&,
> KPluginFactory::CreateInstanceFunction) [with T = JsonPlugin2;
> KPluginFactory::CreateInstanceFunction = QObject* (*)(QWidget*, QObject*,
> const QList<QVariant>&); QVariantList = QList<QVariant>]’:
> /code/kde/src/frameworks/kcoreaddons/src/lib/plugin/kpluginfactory.h:487:74:
> warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]
>                          =
> InheritanceChecker<T>().createInstanceFunction(reinterpret_cast<T *>(0)))
>
> ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from
> /code/kde/src/frameworks/kcoreaddons/autotests/jsonplugin2.cpp:34:
> /code/kde/build-kde/frameworks/kcoreaddons/autotests/jsonplugin2_autogen/include/jsonplugin2.moc:
> At global scope:
> /code/kde/build-kde/frameworks/kcoreaddons/autotests/jsonplugin2_autogen/include/jsonplugin2.moc:153:1:
> error: narrowing conversion of ‘'\37777777703'’ from ‘char’ to ‘unsigned
> char’ inside { } [-Wnarrowing]
>  };
>  ^
> /code/kde/build-kde/frameworks/kcoreaddons/autotests/jsonplugin2_autogen/include/jsonplugin2.moc:153:1:
> error: narrowing conversion of ‘'\37777777651'’ from ‘char’ to ‘unsigned
> char’ inside { } [-Wnarrowing]
> ....
>
>
> With clang 6.0.1 x86_64
>
> [ 63%] Building CXX object
> autotests/CMakeFiles/jsonplugin2.dir/jsonplugin2.cpp.o
> In file included from
> /code/kde/src/frameworks/kcoreaddons/autotests/jsonplugin2.cpp:34:
> /code/kde/build-kde/frameworks/kcoreaddons/autotests/jsonplugin2_autogen/include/jsonplugin2.moc:123:48:
> error: constant expression evaluates to -61
>       which cannot be narrowed to type 'unsigned char' [-Wc++11-narrowing]
>     ']',  0x76,  'E',  's',  't',  'e',  ' ',  '\xc3',
>                                                ^~~~~~
> /code/kde/build-kde/frameworks/kcoreaddons/autotests/jsonplugin2_autogen/include/jsonplugin2.moc:123:48:
> note: insert an explicit cast to silence
>       this issue
>     ']',  0x76,  'E',  's',  't',  'e',  ' ',  '\xc3',
>                                                ^~~~~~
>                                                static_cast<unsigned char>(
> )
> /code/kde/build-kde/frameworks/kcoreaddons/autotests/jsonplugin2_autogen/include/jsonplugin2.moc:124:5:
> error: constant expression evaluates to -87
>       which cannot be narrowed to type 'unsigned char' [-Wc++11-narrowing]
>     '\xa9', ' ',  'o',  'u',  't',  'r',  'o',  ' ',
>     ^~~~~~
>
> Any idea ?
>
>
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