From 298760661f30faf2014f609506f15ff2d3489ddf Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 22 Apr 2021 13:06:11 -0400
Subject: ExternalData: Improve error message when we fail to create a file

Report the underlying system error.
---
 Modules/ExternalData.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/ExternalData.cmake b/Modules/ExternalData.cmake
index 1850e74..189374b 100644
--- a/Modules/ExternalData.cmake
+++ b/Modules/ExternalData.cmake
@@ -949,7 +949,7 @@ function(_ExternalData_link_or_copy src dst)
   endif()
   if(result)
     file(REMOVE "${tmp}")
-    message(FATAL_ERROR "Failed to create\n  ${tmp}\nfrom\n  ${obj}")
+    message(FATAL_ERROR "Failed to create:\n  \"${tmp}\"\nfrom:\n  \"${obj}\"\nwith error:\n  ${result}")
   endif()
 
   # Atomically create/replace the real destination.
-- 
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