From d78c22aa64f63b06b39c644c5d65aee367ec74b4 Mon Sep 17 00:00:00 2001
From: Ron W Moore <webbtrail@gmail.com>
Date: Tue, 25 Aug 2020 09:44:56 -0400
Subject: cmSystemTools: Improve RenameFile on Windows with
 MOVEFILE_WRITE_THROUGH

Add this flag to tell `MoveFileExW` to flush the rename to disk before
returning.

Issue: #19580
---
 Source/cmSystemTools.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index b63c318..3cea743 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -885,8 +885,10 @@ void cmSystemTools::InitializeLibUV()
 namespace {
 bool cmMoveFile(std::wstring const& oldname, std::wstring const& newname)
 {
+  // Use MOVEFILE_REPLACE_EXISTING to replace an existing destination file.
+  // Use MOVEFILE_WRITE_THROUGH to flush the change to disk before returning.
   return MoveFileExW(oldname.c_str(), newname.c_str(),
-                     MOVEFILE_REPLACE_EXISTING);
+                     MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH);
 }
 }
 #endif
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