add guard to qhash_string header

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

diff --git a/tests/benchmarks/core/tools/qhash/qhash_string.h b/tests/benchmarks/core/tools/qhash/qhash_string.h
index 31961ac..b6aec8d 100644 (file)
--- a/tests/benchmarks/core/tools/qhash/qhash_string.h
+++ b/tests/benchmarks/core/tools/qhash/qhash_string.h
@@ -31,6 +31,9 @@
 **
 ****************************************************************************/
 
+#ifndef QHASH_STRING_H
+#define QHASH_STRING_H
+
 #include <QString>
 
 QT_USE_NAMESPACE
@@ -44,3 +47,5 @@ struct String : QString
 QT_BEGIN_NAMESPACE
 uint qHash(const String &);
 QT_END_NAMESPACE
+
+#endif