Fix compilation with /Zc:strictStrings

You can't assign a wide-character literal to a non-const wchar_t*.

Change-Id: I3ec8d4064f8e901bb1c6ff14cdf41550b04c593d
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Remove the use of QT_STATIC_CONST in QtSql

There doesn't seem to be any reason why the macro is actually
necessary. My guess is that someone wrote the code on Windows without
"const", then it failed to compile everywhere else. Instead of fixing
the code by adding the "const", the developer must have added this
macro.

Microsoft Visual Studio mangles the constness of the variable, so we
can't remove it now from existing compilers. But we can for the new
version.

This is also required to compile QtSql with the MSVC option
/Zc:strictStrings, which is enabled in Qt 5.4.

Change-Id: Ibf2c2cb7287a4332d69aa81080a37aab4327677d
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Mark Brand <mabrand@mabrand.nl>
fix QT_SUPPORTS macro with msvc2008

Change-Id: I70ffba51d2672574d7cefc3cb44724341cd86f22
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Fix data race on QLoggingCategory when using qDebug from multiple threads

setEnabled() would race with isEnabled()/isDebugEnabled()/etc.

Change-Id: I2004cba81d5417a634b97f5c2f98d3a4ab71770d
Reviewed-by: David Faure <david.faure@kdab.com>