feature2d: fix expansion problems with CV_ENUM in perf

* expand arguments before passing them to CV_ENUM. This does not need modifications of CV_ENUM.
* added include guards to `perf_feature2d.hpp`

modules/features2d/perf/perf_feature2d.hpp

@@ -1,3 +1,6 @@
+#ifndef __OPENCV_PERF_FEATURE2D_HPP__
+#define __OPENCV_PERF_FEATURE2D_HPP__
+
 #include "perf_precomp.hpp"
 
 /* cofiguration for tests of detectors/descriptors. shared between ocl and cpu tests. */
@@ -22,8 +25,10 @@ using std::tr1::get;
     BRISK_DEFAULT,                                                                      \
     KAZE_DEFAULT
 
+#define CV_ENUM_EXPAND(name, ...) CV_ENUM(name, __VA_ARGS__)
+
 enum Feature2DVals { DETECTORS_ONLY, DETECTORS_EXTRACTORS };
-CV_ENUM(Feature2DType, DETECTORS_ONLY, DETECTORS_EXTRACTORS)
+CV_ENUM_EXPAND(Feature2DType, DETECTORS_ONLY, DETECTORS_EXTRACTORS)
 
 typedef std::tr1::tuple<Feature2DType, string> Feature2DType_String_t;
 typedef perf::TestBaseWithParam<Feature2DType_String_t> feature2d;
@@ -77,3 +82,5 @@ static inline Ptr<Feature2D> getFeature2D(Feature2DType type)
         return Ptr<Feature2D>();
     }
 }
+
+#endif // __OPENCV_PERF_FEATURE2D_HPP__