Fixed mingw build warnings

modules/flann/include/opencv2/flann/any.h

@@ -12,6 +12,7 @@
  * Adapted for FLANN by Marius Muja
  */
 
+#include "defines.h"
 #include <stdexcept>
 #include <ostream>
 #include <typeinfo>
@@ -95,6 +96,16 @@ struct big_any_policy : typed_base_any_policy<T>
     virtual void print(std::ostream& out, void* const* src) { out << *reinterpret_cast<T const*>(*src); }
 };
 
+template<> inline void big_any_policy<flann_centers_init_t>::print(std::ostream& out, void* const* src)
+{
+    out << int(*reinterpret_cast<flann_centers_init_t const*>(*src));
+}
+
+template<> inline void big_any_policy<flann_algorithm_t>::print(std::ostream& out, void* const* src)
+{
+    out << int(*reinterpret_cast<flann_algorithm_t const*>(*src));
+}
+
 template<typename T>
 struct choose_policy
 {

modules/flann/src/flann.cpp

@@ -36,7 +36,7 @@ namespace cvflann
     */
     flann_distance_t flann_distance_type_ = FLANN_DIST_L2;
     flann_distance_t flann_distance_type() { return flann_distance_type_; }
-    
+
     /**
      * Set distance type to used
      * \deprecated
@@ -52,6 +52,6 @@ namespace cvflann
         }
         flann_distance_type_ = distance_type;
     }
-    
+
     void dummyfunc() {}
 }

modules/flann/src/precomp.hpp

@@ -1,7 +1,3 @@
-#ifdef __GNUC__
-#  pragma GCC diagnostic ignored "-Wsign-promo"
-#endif
-
 #ifndef _OPENCV_FLANN_PRECOMP_HPP_
 #define _OPENCV_FLANN_PRECOMP_HPP_