qmake: Work around MSVC compiler bug.

Disable optimization for getProjectUUID() as it triggers
ASSERT: "&other != this" at qstring.h:720 with -O2.

Change-Id: I51b31d4318ba9be187c186623099171d8f48235b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

qmake/generators/win32/msvc_vcproj.cpp

@@ -305,6 +305,16 @@ struct VcsolutionDepend {
     QStringList dependencies;
 };
 
+/* Disable optimization in getProjectUUID() due to a compiler
+ * bug in MSVC 2010 that causes ASSERT: "&other != this" in the QString
+ * copy constructor for non-empty file names at:
+ * filename.isEmpty()?project->first("QMAKE_MAKEFILE"):filename */
+
+#ifdef Q_CC_MSVC
+#   pragma optimize( "g", off )
+#   pragma warning ( disable : 4748 )
+#endif
+
 QUuid VcprojGenerator::getProjectUUID(const QString &filename)
 {
     bool validUUID = true;
@@ -335,6 +345,10 @@ QUuid VcprojGenerator::getProjectUUID(const QString &filename)
     return uuid;
 }
 
+#ifdef Q_CC_MSVC
+#   pragma optimize( "g", on )
+#endif
+
 QUuid VcprojGenerator::increaseUUID(const QUuid &id)
 {
     QUuid result(id);