From 69dca1722f65994794b141ebc05e9b09b4586e03 Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Wed, 6 Dec 2017 14:29:01 +0200
Subject: [PATCH] Use run-time dynamic linking for AddDllDirectory and
 RemoveDllDirectory to support mingw-w64 build and Windows 7 with KB2533623.

---
 platform/windows/os_windows.cpp | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index d62ecc6016f..79a760f055b 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -1629,16 +1629,23 @@ void OS_Windows::_update_window_style(bool repaint) {
 
 Error OS_Windows::open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path) {
 
+	typedef DLL_DIRECTORY_COOKIE(WINAPI * PAddDllDirectory)(PCWSTR);
+	typedef BOOL(WINAPI * PRemoveDllDirectory)(DLL_DIRECTORY_COOKIE);
+
+	PAddDllDirectory add_dll_directory = (PAddDllDirectory)GetProcAddress(GetModuleHandle("kernel32.dll"), "AddDllDirectory");
+	PRemoveDllDirectory remove_dll_directory = (PRemoveDllDirectory)GetProcAddress(GetModuleHandle("kernel32.dll"), "RemoveDllDirectory");
+
+	bool has_dll_directory_api = ((add_dll_directory != NULL) && (remove_dll_directory != NULL));
 	DLL_DIRECTORY_COOKIE cookie;
 
-	if (p_also_set_library_path) {
-		cookie = AddDllDirectory(p_path.get_base_dir().c_str());
+	if (p_also_set_library_path && has_dll_directory_api) {
+		cookie = add_dll_directory(p_path.get_base_dir().c_str());
 	}
 
-	p_library_handle = (void *)LoadLibraryExW(p_path.c_str(), NULL, p_also_set_library_path ? LOAD_LIBRARY_SEARCH_DEFAULT_DIRS : 0);
+	p_library_handle = (void *)LoadLibraryExW(p_path.c_str(), NULL, (p_also_set_library_path && has_dll_directory_api) ? LOAD_LIBRARY_SEARCH_DEFAULT_DIRS : 0);
 
-	if (p_also_set_library_path) {
-		RemoveDllDirectory(cookie);
+	if (p_also_set_library_path && has_dll_directory_api) {
+		remove_dll_directory(cookie);
 	}
 
 	if (!p_library_handle) {