qToBigEndian(src, dest) does not change byte order on little endian system.

The qToBigEndian function does not produce the desired result.

I'm on a little endian machine (x86_64) using Qt 5.10.0 with Mingw64. A protocol requires a size value in big endian order and when I use qToBigEndian(src, dest) to write it into a QByteArray buffer, the buffer contains the value in little endian order:

const std::size_t oldSize = commandData.size();
const std::size_t newSize = oldSize + sizeof(T);
commandData.resize(newSize);
qToBigEndian(val, commandData.data() + oldSize); 

 val is a quint16

new length = 16
QINFO : TestFunctionCommands::testMakeCommand() "\x00\x10"

The value should be written as a 0x1000 and not as 0x0010.

FAIL! : TestFunctionCommands::testMakeCommand() Compared values are not the same
Actual (qToLittleEndian<quint16>(reinterpret_cast<quint16>(data.data()))): 4096
Expected (expectedSize) : 16