diff --git a/tests/auto/corelib/tools/collections/tst_collections.cpp b/tests/auto/corelib/tools/collections/tst_collections.cpp
index 1dfe01663f..78d3e9e2b8 100644
--- a/tests/auto/corelib/tools/collections/tst_collections.cpp
+++ b/tests/auto/corelib/tools/collections/tst_collections.cpp
@@ -3129,7 +3129,7 @@ void tst_Collections::qtimerList()
     QFAIL("QList preallocates too much memory");
 }
 
-#define QVERIFY_TYPE(Type) QVERIFY(sizeof(Type))
+#define QVERIFY_TYPE(Type) QVERIFY(sizeof(Type) > 0)
 
 template <typename Container>
 void testContainerTypedefs(Container container)
diff --git a/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp b/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp
index d892125c87..33f1b25519 100644
--- a/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp
+++ b/tests/auto/corelib/tools/qringbuffer/tst_qringbuffer.cpp
@@ -294,16 +294,16 @@ void tst_QRingBuffer::readLine()
     char stringBuf[102];
     stringBuf[101] = 0; // non-crash terminator
     QVERIFY(ringBuffer.readLine(stringBuf, sizeof(stringBuf) - 2) == ba1.size());
-    QVERIFY(QByteArray(stringBuf, strlen(stringBuf)) == ba1);
+    QVERIFY(QByteArray(stringBuf, int(strlen(stringBuf))) == ba1);
 
     // check first empty string reading
-    stringBuf[0] = 0xFF;
-    QCOMPARE(ringBuffer.readLine(stringBuf, sizeof(stringBuf) - 2), ba2.size());
+    stringBuf[0] = char(0xFF);
+    QCOMPARE(ringBuffer.readLine(stringBuf, int(sizeof(stringBuf)) - 2), ba2.size());
     QVERIFY(stringBuf[0] == ba2[0]);
 
-    QVERIFY(ringBuffer.readLine(stringBuf, sizeof(stringBuf) - 2) == (ba3.size() + ba4.size()
+    QVERIFY(ringBuffer.readLine(stringBuf, int(sizeof(stringBuf)) - 2) == (ba3.size() + ba4.size()
         + ba2.size()));
-    QVERIFY(QByteArray(stringBuf, strlen(stringBuf)) == (ba3 + ba4 + ba2));
+    QVERIFY(QByteArray(stringBuf, int(strlen(stringBuf))) == (ba3 + ba4 + ba2));
     QVERIFY(ringBuffer.size() == 0);
 }
 
diff --git a/tests/auto/gui/painting/qpainterpath/tst_qpainterpath.cpp b/tests/auto/gui/painting/qpainterpath/tst_qpainterpath.cpp
index a03bf2ba4e..6bfec61363 100644
--- a/tests/auto/gui/painting/qpainterpath/tst_qpainterpath.cpp
+++ b/tests/auto/gui/painting/qpainterpath/tst_qpainterpath.cpp
@@ -37,9 +37,7 @@
 #include <qfile.h>
 #include <qpainterpath.h>
 #include <qpen.h>
-
-#define _USE_MATH_DEFINES
-#include <math.h>
+#include <qmath.h>
 
 class tst_QPainterPath : public QObject
 {
diff --git a/tests/auto/gui/painting/qpainterpathstroker/tst_qpainterpathstroker.cpp b/tests/auto/gui/painting/qpainterpathstroker/tst_qpainterpathstroker.cpp
index f55260c572..3bccfb75f7 100644
--- a/tests/auto/gui/painting/qpainterpathstroker/tst_qpainterpathstroker.cpp
+++ b/tests/auto/gui/painting/qpainterpathstroker/tst_qpainterpathstroker.cpp
@@ -36,9 +36,7 @@
 
 #include <qfile.h>
 #include <QPainterPathStroker>
-
-#define _USE_MATH_DEFINES
-#include <math.h>
+#include <qmath.h>
 
 class tst_QPainterPathStroker : public QObject
 {
diff --git a/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp b/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp
index bd4da12ea3..df7de2b3b7 100644
--- a/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp
+++ b/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp
@@ -944,7 +944,7 @@ void tst_QRawFont::rawFontFromInvalidData()
 
     QVERIFY(!font.isValid());
 
-    invalidData.fill(255, 1024);
+    invalidData.fill(char(255), 1024);
     font.loadFromData(invalidData, 10, QFont::PreferDefaultHinting);
 
     QVERIFY(!font.isValid());
diff --git a/tests/auto/network/ssl/qsslsocket_onDemandCertificates_member/tst_qsslsocket_onDemandCertificates_member.cpp b/tests/auto/network/ssl/qsslsocket_onDemandCertificates_member/tst_qsslsocket_onDemandCertificates_member.cpp
index 94d7c3905c..7f4f2ed2ad 100644
--- a/tests/auto/network/ssl/qsslsocket_onDemandCertificates_member/tst_qsslsocket_onDemandCertificates_member.cpp
+++ b/tests/auto/network/ssl/qsslsocket_onDemandCertificates_member/tst_qsslsocket_onDemandCertificates_member.cpp
@@ -227,6 +227,7 @@ void tst_QSslSocket_onDemandCertificates_member::onDemandRootCertLoadingMemberMe
     bool works;
 #if defined (Q_OS_WIN)
     works = false; // on Windows, this won't work even though we use on demand loading
+    Q_UNUSED(rootCertLoadingAllowed)
 #else
     works = rootCertLoadingAllowed;
 #endif
diff --git a/tests/auto/other/qprocess_and_guieventloop/write-read-write/main.cpp b/tests/auto/other/qprocess_and_guieventloop/write-read-write/main.cpp
index bddffc2c6a..352968729e 100644
--- a/tests/auto/other/qprocess_and_guieventloop/write-read-write/main.cpp
+++ b/tests/auto/other/qprocess_and_guieventloop/write-read-write/main.cpp
@@ -33,7 +33,7 @@
 
 #include <stdio.h>
 
-int main(int argc, char **argv)
+int main(int, char **argv)
 {
     const char *msg = argv[1];
     char buf[2];
diff --git a/tests/manual/qnetworkaccessmanager/qget/downloadmanager.cpp b/tests/manual/qnetworkaccessmanager/qget/downloadmanager.cpp
index 0694003e0a..0d1014a6ff 100644
--- a/tests/manual/qnetworkaccessmanager/qget/downloadmanager.cpp
+++ b/tests/manual/qnetworkaccessmanager/qget/downloadmanager.cpp
@@ -130,7 +130,7 @@ void DownloadManager::proxyAuthenticationRequired(const QNetworkProxy &, QAuthen
 }
 
 #ifndef QT_NO_SSL
-void DownloadManager::sslErrors(QNetworkReply *reply, const QList<QSslError> &errors)
+void DownloadManager::sslErrors(QNetworkReply *, const QList<QSslError> &errors)
 {
     qDebug() << "sslErrors";
     foreach (const QSslError &error, errors) {
diff --git a/tests/manual/qnetworkreply/main.cpp b/tests/manual/qnetworkreply/main.cpp
index 9d199c3755..f91309502b 100644
--- a/tests/manual/qnetworkreply/main.cpp
+++ b/tests/manual/qnetworkreply/main.cpp
@@ -180,6 +180,8 @@ void tst_qnetworkreply::setSslConfiguration()
     QCOMPARE(rootCertLoadingAllowed, true);
 #elif defined(Q_OS_MAC)
     QCOMPARE(rootCertLoadingAllowed, false);
+#else
+    Q_UNUSED(rootCertLoadingAllowed)
 #endif // other platforms: undecided (Windows: depends on the version)
     if (works) {
         QCOMPARE(reply->error(), QNetworkReply::NoError);
diff --git a/tests/manual/windowflags/controllerwindow.cpp b/tests/manual/windowflags/controllerwindow.cpp
index 5c06a9a646..2981bb9bf1 100644
--- a/tests/manual/windowflags/controllerwindow.cpp
+++ b/tests/manual/windowflags/controllerwindow.cpp
@@ -102,7 +102,7 @@ ControllerWindow::ControllerWindow() : previewWidget(0)
     updatePreview();
 }
 
-bool ControllerWindow::eventFilter(QObject *o, QEvent *e)
+bool ControllerWindow::eventFilter(QObject *, QEvent *e)
 {
     if (e->type() == QEvent::WindowStateChange)
         updateStateControl();