Fixed some mingw-w64 compilation issues

Author: mshabunin

modules/datasets/src/util.cpp

@@ -45,7 +45,7 @@
 
 #include <sstream>
 
-#ifdef __GNUC__
+#ifndef _WIN32
     #include <unistd.h>
     #include <dirent.h>
     #include <sys/stat.h>
@@ -73,7 +73,7 @@ void split(const string &s, vector<string> &elems, char delim)
 
 void createDirectory(const string &path)
 {
-#ifdef __GNUC__
+#ifndef _WIN32
     mkdir(path.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
 #else
     mkdir(path.c_str());
@@ -82,7 +82,7 @@ void createDirectory(const string &path)
 
 void getDirList(const string &dirName, vector<string> &fileNames)
 {
-#ifdef __GNUC__
+#ifndef _WIN32
     struct dirent **namelist;
     int n = scandir(dirName.c_str(), &namelist, NULL, alphasort);
     for (int i=0; i<n; ++i)

modules/line_descriptor/src/bitarray.hpp

@@ -43,7 +43,7 @@
 #ifndef __OPENCV_BITARRAY_HPP
 #define __OPENCV_BITARRAY_HPP
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #pragma warning( disable : 4267 )
 #endif
 

modules/line_descriptor/src/bitops.hpp

@@ -45,7 +45,7 @@
 
 #include "precomp.hpp"
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 # include <intrin.h>
 # define popcnt __popcnt
 # pragma warning( disable : 4267 )

modules/line_descriptor/src/precomp.hpp

@@ -42,7 +42,7 @@
 #ifndef __OPENCV_PRECOMP_H__
 #define __OPENCV_PRECOMP_H__
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #pragma warning( disable : 4267 )
 #endif
 

modules/line_descriptor/src/types.hpp

@@ -49,7 +49,7 @@
 #ifndef __OPENCV_TYPES_HPP
 #define __OPENCV_TYPES_HPP
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #pragma warning( disable : 4267 )
 #endif
 

modules/surface_matching/src/icp.cpp

@@ -425,14 +425,14 @@ int ICP::registerModelToScene(const Mat& srcPC, const Mat& dstPC, double& residu
         if (node)
         {
           // select the first node
-          long idx = reinterpret_cast<long>(node->data)-1, dn=0;
+          size_t idx = reinterpret_cast<size_t>(node->data)-1, dn=0;
           int dup = (int)node->key-1;
-          long minIdxD = idx;
+          size_t minIdxD = idx;
           float minDist = distances[idx];
 
           while ( node )
           {
-            idx = reinterpret_cast<long>(node->data)-1;
+            idx = reinterpret_cast<size_t>(node->data)-1;
 
             if (distances[idx] < minDist)
             {