Add QLibraryInfo::version() returning the Qt version as QVersionNumber

[ChangeLog][QtCore][QLibraryInfo] Added QLibraryInfo::version(), which
returns the current version of the Qt library as a QVersionNumber
object.

Change-Id: Ifea6e497f11a461db432ffff1448d4dc84ef57b1
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

src/corelib/global/qglobal.cpp

@@ -1033,7 +1033,7 @@ Q_STATIC_ASSERT_X(QT_POINTER_SIZE == sizeof(void *), "QT_POINTER_SIZE defined in
     example, "4.1.2"). This may be a different version than the
     version the application was compiled against.
 
-    \sa QT_VERSION_STR
+    \sa QT_VERSION_STR, QLibraryInfo::version()
 */
 
 const char *qVersion() Q_DECL_NOTHROW

src/corelib/global/qlibraryinfo.cpp

@@ -366,6 +366,19 @@ QLibraryInfo::isDebugBuild()
 #endif
 }
 
+#ifndef QT_BOOTSTRAPPED
+/*!
+    \since 5.8
+    Returns the version of the Qt library.
+
+    \sa qVersion()
+*/
+QVersionNumber QLibraryInfo::version() Q_DECL_NOTHROW
+{
+    return QVersionNumber(QT_VERSION_MAJOR, QT_VERSION_MINOR, QT_VERSION_PATCH);
+}
+#endif // QT_BOOTSTRAPPED
+
 #endif // QT_BUILD_QMAKE
 
 /*

src/corelib/global/qlibraryinfo.h

@@ -42,6 +42,7 @@
 
 #include <QtCore/qstring.h>
 #include <QtCore/qdatetime.h>
+#include <QtCore/qversionnumber.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -63,6 +64,10 @@ public:
 
     static bool isDebugBuild();
 
+#ifndef QT_BOOTSTRAPPED
+    static QVersionNumber version() Q_DECL_NOTHROW Q_DECL_CONST_FUNCTION;
+#endif
+
     enum LibraryLocation
     {
         PrefixPath = 0,

tests/auto/corelib/tools/qversionnumber/tst_qversionnumber.cpp

@@ -29,6 +29,7 @@
 
 #include <QtTest/QtTest>
 #include <QtCore/qversionnumber.h>
+#include <QtCore/qlibraryinfo.h>
 
 class tst_QVersionNumber : public QObject
 {
@@ -79,6 +80,7 @@ private slots:
     void serialize_data();
     void serialize();
     void moveSemantics();
+    void qtVersion();
 };
 
 void tst_QVersionNumber::singleInstanceData()
@@ -636,6 +638,17 @@ void tst_QVersionNumber::moveSemantics()
 #endif
 }
 
+void tst_QVersionNumber::qtVersion()
+{
+    QVersionNumber v = QLibraryInfo::version();
+    QVERIFY(!v.isNull());
+    QCOMPARE(v.majorVersion(), QT_VERSION_MAJOR);
+    // we can't compare the minor and micro version:
+    // the library may change without the test being recompiled
+
+    QCOMPARE(v.toString(), QString(qVersion()));
+}
+
 QTEST_APPLESS_MAIN(tst_QVersionNumber)
 
 #include "tst_qversionnumber.moc"