[Development] Let's please drop MSVC 2013 for 5.10

[André Pönitz]

On Fri, Jun 16, 2017 at 12:52:24PM -0700, Thiago Macieira wrote:
> Here's a tricky question: how do you create a QStringLiteral with non-ASCII 
> characters that will work on all our supported compilers?

I don't have to, unless I have profiler supported evidence that
it matters.

In the common case where it does not matter, the string can be
created at run time.

For the rare (vulgo: non-existent) case where that would matter
in Qt sources, something QStringLiteral-like along the lines of

    #define QSTRINGLITERAL(...) \
        []() -> QString { \
            const ushort X[] = { __VA_ARGS__ }; \
            enum { Size = sizeof(X) / sizeof(X[0]) }; \
            static const QStaticStringData<Size> qstring_literal = { \
                { Q_REFCOUNT_INITIALIZE_STATIC, Size, 0, 0, sizeof(QStringData) }, \
                __VA_ARGS__ \
            }; \
            QStringDataPtr holder = { qstring_literal.data_ptr() }; \
            const QString qstring_literal_temp(holder); \
            return qstring_literal_temp; 
        }()

and using 

    QSTRINGLITERAL('M', 0xf6, 0xf6, 0xf6, 'p', '!')

instead of

    QStringLiteral("Möööp!")

should be possible to use, too.

Andre'