From d34986036fdc0dfa85a2d85a4fe5bce0368b1187 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 17 Nov 2022 13:49:25 -0500
Subject: ExternalData: Improve robustness on Windows to copy a data object to
 a file

When an external data object was recently created on disk, perhaps
fetched by the current process or another process, it may be
inaccessible on Windows for a short time.  Tell our `file(COPY_FILE)`
call to retry a few times to copy the object to the final file path.

Hopefully this will resolve our long-standing spurious failures of the
`Module.ExternalData` test on Windows.
---
 Modules/ExternalData.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/ExternalData.cmake b/Modules/ExternalData.cmake
index 189374b..6826c7b 100644
--- a/Modules/ExternalData.cmake
+++ b/Modules/ExternalData.cmake
@@ -945,7 +945,7 @@ function(_ExternalData_link_or_copy src dst)
     file(CREATE_LINK "${tgt}" "${tmp}" RESULT result COPY_ON_ERROR SYMBOLIC)
   else()
     # Create a copy.
-    file(COPY_FILE "${src}" "${tmp}" RESULT result)
+    file(COPY_FILE "${src}" "${tmp}" RESULT result INPUT_MAY_BE_RECENT)
   endif()
   if(result)
     file(REMOVE "${tmp}")
-- 
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