fix build error in mingw on windows

include/LightGBM/utils/text_reader.h

@@ -159,7 +159,7 @@ public:
       }
       else {
         const size_t idx = random.NextInt(0, line_idx + 1);
-        if (idx < sample_cnt) {
+        if (idx < static_cast<size_t>(sample_cnt)) {
           out_sampled_data->operator[](idx) = std::string(buffer, size);
         }
       }
@@ -184,7 +184,7 @@ public:
   }
 
   INDEX_T SampleAndFilterFromFile(const std::function<bool(INDEX_T)>& filter_fun, std::vector<INDEX_T>* out_used_data_indices,
-    Random& random, size_t sample_cnt, std::vector<std::string>* out_sampled_data) {
+    Random& random, INDEX_T sample_cnt, std::vector<std::string>* out_sampled_data) {
     INDEX_T cur_sample_cnt = 0;
     out_used_data_indices->clear();
     INDEX_T total_cnt = ReadAllAndProcess(
@@ -199,7 +199,7 @@ public:
         }
         else {
           const size_t idx = random.NextInt(0, out_used_data_indices->size());
-          if (idx < sample_cnt) {
+          if (idx < static_cast<size_t>(sample_cnt) ) {
             out_sampled_data->operator[](idx) = std::string(buffer, size);
           }
         }
@@ -286,7 +286,7 @@ public:
   INDEX_T ReadPartAndProcessParallel(const std::vector<INDEX_T>& used_data_indices, const std::function<void(INDEX_T, const std::vector<std::string>&)>& process_fun) {
     return ReadAllAndProcessParallelWithFilter(process_fun,
       [&used_data_indices](INDEX_T used_cnt ,INDEX_T total_cnt) {
-      if (used_cnt < used_data_indices.size() && total_cnt == used_data_indices[used_cnt]) {
+      if (static_cast<size_t>(used_cnt) < used_data_indices.size() && total_cnt == used_data_indices[used_cnt]) {
         return true;
       }
       else {

src/CMakeLists.txt

@@ -25,3 +25,10 @@ if(USE_MPI)
   TARGET_LINK_LIBRARIES(_lightgbm ${MPI_CXX_LIBRARIES})
 endif(USE_MPI)
 
+if(WIN32)
+  TARGET_LINK_LIBRARIES(lightgbm Ws2_32)
+  TARGET_LINK_LIBRARIES(_lightgbm Ws2_32)
+  TARGET_LINK_LIBRARIES(lightgbm IPHLPAPI)
+  TARGET_LINK_LIBRARIES(_lightgbm IPHLPAPI)
+endif(WIN32)
+

src/network/socket_wrapper.hpp

@@ -3,7 +3,9 @@
 #ifdef USE_SOCKET
 
 #if defined(_WIN32)
+#ifdef _MSC_VER
 #define NOMINMAX
+#endif
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <iphlpapi.h>
@@ -46,6 +48,35 @@ const int INVALID_SOCKET = -1;
 
 #endif
 
+#ifdef _WIN32
+#ifndef _MSC_VER
+// not using visual studio in windows
+inline int inet_pton(int af, const char *src, void *dst)
+{
+  struct sockaddr_storage ss;
+  int size = sizeof(ss);
+  char src_copy[INET6_ADDRSTRLEN + 1];
+
+  ZeroMemory(&ss, sizeof(ss));
+  /* stupid non-const API */
+  strncpy(src_copy, src, INET6_ADDRSTRLEN + 1);
+  src_copy[INET6_ADDRSTRLEN] = 0;
+
+  if (WSAStringToAddress(src_copy, af, NULL, (struct sockaddr *)&ss, &size) == 0) {
+    switch (af) {
+    case AF_INET:
+      *(struct in_addr *)dst = ((struct sockaddr_in *)&ss)->sin_addr;
+      return 1;
+    case AF_INET6:
+      *(struct in6_addr *)dst = ((struct sockaddr_in6 *)&ss)->sin6_addr;
+      return 1;
+    }
+  }
+  return 0;
+}
+#endif
+#endif
+
 #define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
 #define FREE(x) HeapFree(GetProcessHeap(), 0, (x))