add patch from #5159

Author: shiyu1994

CMakeLists.txt

@@ -299,6 +299,18 @@ if(WIN32 AND MINGW)
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libstdc++")
 endif()
 
+# Check if inet_pton is already available, to avoid conflicts with the implementation in LightGBM.
+# As of 2022, MinGW started including a definition of inet_pton.
+if(WIN32)
+  include(CheckSymbolExists)
+  list(APPEND CMAKE_REQUIRED_LIBRARIES "ws2_32")
+  check_symbol_exists(inet_pton "ws2tcpip.h" WIN_INET_PTON_FOUND)
+  if(WIN_INET_PTON_FOUND)
+    add_definitions(-DWIN_HAS_INET_PTON)
+  endif()
+  list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "ws2_32")
+endif()
+
 if(MSVC)
     SET(variables
         CMAKE_C_FLAGS_DEBUG

src/network/socket_wrapper.hpp

@@ -60,11 +60,8 @@ const int INVALID_SOCKET = -1;
 #endif
 
 #ifdef _WIN32
-#ifndef _UCRT
-// Recent MinGW has inet_pton, which then causes compiler error in
-// combination with this replacement.
-#ifndef _MSC_VER
-// not using visual studio in windows
+// existence of inet_pton is checked in CMakeLists.txt and configure.win, then stored in WIN_HAS_INET_PTON
+#ifndef WIN_HAS_INET_PTON
 inline int inet_pton(int af, const char *src, void *dst) {
   struct sockaddr_storage ss;
   int size = sizeof(ss);
@@ -89,7 +86,6 @@ inline int inet_pton(int af, const char *src, void *dst) {
 }
 #endif
 #endif
-#endif
 
 #define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
 #define FREE(x) HeapFree(GetProcessHeap(), 0, (x))