avoid compile warning when using clang++ with -Wshorten-64-to-32

Change-Id: I78a6cd84ac5b8c250d9569d864a7e38269b85e10
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

mkspecs/features/qt_module_headers.prf

@@ -230,7 +230,7 @@ headersclean:!internal_module {
                 hcleanFLAGS += -Wcast-align
 
             clang_ver = $${QT_CLANG_MAJOR_VERSION}.$${QT_CLANG_MINOR_VERSION}
-            versionAtLeast(clang_ver, 3.8): hcleanFLAGS += -Wdouble-promotion
+            versionAtLeast(clang_ver, 3.8): hcleanFLAGS += -Wdouble-promotion -Wshorten-64-to-32
 
             !clang {
                 # options accepted only by GCC

src/corelib/kernel/qtestsupport_core.h

@@ -76,14 +76,14 @@ Q_REQUIRED_RESULT static bool qWaitFor(Functor predicate, int timeout = 5000)
         QCoreApplication::processEvents(QEventLoop::AllEvents);
         QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
 
-        remaining = deadline.remainingTime();
+        remaining = int(deadline.remainingTime());
         if (remaining > 0)
             QTestPrivate::qSleep(qMin(10, remaining));
 
         if (predicate())
             return true;
 
-        remaining = deadline.remainingTime();
+        remaining = int(deadline.remainingTime());
     } while (remaining > 0);
 
     return predicate(); // Last chance

src/corelib/text/qstringbuilder.h

@@ -120,7 +120,7 @@ private:
         if (!QConcatenable< QStringBuilder<A, B> >::ExactSize && int(len) != d - start) {
             // this resize is necessary since we allocate a bit too much
             // when dealing with variable sized 8-bit encodings
-            s.resize(d - start);
+            s.resize(int(d - start));
         }
         return s;
     }

src/corelib/tools/qvector.h

@@ -671,7 +671,7 @@ int indexOf(const QVector<T> &vector, const U &u, int from)
         auto e = vector.end();
         while (++n != e)
             if (*n == u)
-                return n - vector.begin();
+                return int(n - vector.begin());
     }
     return -1;
 }
@@ -688,7 +688,7 @@ int lastIndexOf(const QVector<T> &vector, const U &u, int from)
         auto n = vector.begin() + from + 1;
         while (n != b) {
             if (*--n == u)
-                return n - b;
+                return int(n - b);
         }
     }
     return -1;

src/testlib/qtest.h

@@ -97,7 +97,7 @@ template<> inline char *toString(const QBitArray &ba)
     qsizetype size = ba.size();
     char *str = new char[size + 1];
     for (qsizetype i = 0; i < size; ++i)
-        str[i] = "01"[ba.testBit(i)];
+        str[i] = "01"[ba.testBit(int(i))];
     str[size] = '\0';
     return str;
 }