Fix clang-cl compiler warnings

- known but unsupported action 'shared' for '#pragma section'
  [-Wignored-pragmas]
- #include resolved using non-portable Microsoft search rules
  [-Wmicrosoft-include]
- variable is used uninitialized whenever switch default is taken
  [-Wsometimes-uninitialized]

Change-Id: I466352ff97a2bcf07e706c045568e581dd08a94e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/global/qglobal_p.h

@@ -63,7 +63,7 @@ QT_BEGIN_NAMESPACE
 Q_CORE_EXPORT void qTzSet();
 Q_CORE_EXPORT time_t qMkTime(struct tm *when);
 
-#if !defined(Q_CC_MSVC)
+#if !defined(Q_CC_MSVC) || defined(Q_CC_CLANG)
 Q_NORETURN
 #endif
 Q_CORE_EXPORT void qAbort();

src/corelib/global/qlogging.cpp

@@ -159,7 +159,7 @@ using namespace Qt::StringLiterals;
     \snippet code/src_corelib_global_qglobal.cpp 4
 */
 
-#if !defined(Q_CC_MSVC)
+#if !defined(Q_CC_MSVC) || defined(Q_CC_CLANG)
 Q_NORETURN
 #endif
 static void qt_message_fatal(QtMsgType, const QMessageLogContext &context, const QString &message);

src/corelib/global/qversiontagging.h

@@ -86,7 +86,7 @@ struct QVersionTag
 //   Calling convention on other architectures does not prepend a _
 #    define QT_MANGLE_IMPORT_PREFIX     __imp_
 #  endif
-#  ifdef Q_CC_MSVC
+#  if defined(Q_CC_MSVC_ONLY)
 #    pragma section(".qtversion",read,shared)
 #    define QT_VERSION_TAG_SECTION      __declspec(allocate(".qtversion"))
 #    define QT_VERSION_TAG_ATTRIBUTE    __declspec(selectany) extern const

src/corelib/mimetypes/qmimeprovider.cpp

@@ -20,7 +20,7 @@
 #include <QtEndian>
 
 #if QT_CONFIG(mimetype_database)
-#  if defined(Q_CC_MSVC)
+#  if defined(Q_CC_MSVC_ONLY)
 #    pragma section(".qtmimedatabase", read, shared)
 __declspec(allocate(".qtmimedatabase")) __declspec(align(4096))
 #  elif defined(Q_OS_DARWIN)

src/network/socket/qhttpsocketengine_p.h

@@ -16,10 +16,12 @@
 //
 
 #include <QtNetwork/private/qtnetworkglobal_p.h>
-#include "private/qabstractsocketengine_p.h"
+
+#include <QtNetwork/qnetworkproxy.h>
+
 #include "qabstractsocket.h"
-#include "qnetworkproxy.h"
 #include "private/qauthenticator_p.h"
+#include "private/qabstractsocketengine_p.h"
 
 QT_REQUIRE_CONFIG(http);
 

src/network/socket/qsocks5socketengine_p.h

@@ -16,8 +16,10 @@
 //
 
 #include <QtNetwork/private/qtnetworkglobal_p.h>
+
+#include <QtNetwork/qnetworkproxy.h>
+
 #include "qabstractsocketengine_p.h"
-#include "qnetworkproxy.h"
 
 QT_REQUIRE_CONFIG(socks5);