From f33fed6fa1f6a2359d49a614b741acb910a28015 Mon Sep 17 00:00:00 2001
From: Piyush Aggarwal <piyushaggarwal002@gmail.com>
Date: Wed, 16 Jun 2021 17:09:55 +0530
Subject: [PATCH] windows: fix support for WIN_SDK < 19041

inspired by : https://gitlab.kitware.com/cmake/cmake/-/blob/v3.17.3/Modules/InstallRequiredSystemLibraries.cmake#L339-358
Since CMake doesn't really has a way of providing the Win10 SDK's version ( see: https://gitlab.kitware.com/cmake/cmake/-/issues/20773 )
we read the XML file set up by the SDK and filter the SDK version out of it
---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27ed1d798..3c5e2958a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -101,7 +101,11 @@ if (KF5_OPTIONAL_COMPONENTS)
 endif()
 
 if (WIN32)
-    string(REGEX MATCH "[0-9][0-9][0-9][0-9][0-9]" WIN_SDK_VERSION "${CMAKE_SYSTEM_VERSION}" )
+    get_filename_component(WINDOWS_KITS_DIR
+        "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows Kits\\Installed Roots;KitsRoot10]" ABSOLUTE)
+    file(READ "${WINDOWS_KITS_DIR}/SDKManifest.xml" SDK_MANIFEST)
+    string(REGEX MATCH "PlatformIdentity[^\n]*" PLATFORM_IDENTITY "${SDK_MANIFEST}" )
+    string(REGEX MATCH "[0-9][0-9][0-9][0-9][0-9]" WIN_SDK_VERSION "${PLATFORM_IDENTITY}" )
     add_compile_definitions(WIN_SDK_VERSION=${WIN_SDK_VERSION})
 endif()