From 51acae534a504d5cc3acf06ef1a9557b118b039a Mon Sep 17 00:00:00 2001
From: Daan De Meyer <daan.j.demeyer@gmail.com>
Date: Mon, 18 Jan 2021 22:02:45 +0000
Subject: install(EXPORT): Set copy-if-different on install export config files

Avoid reinstalling the per-config export install files if the
contents didn't change after a configure.
---
 Source/cmExportInstallFileGenerator.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Source/cmExportInstallFileGenerator.cxx b/Source/cmExportInstallFileGenerator.cxx
index 0b9b183..3c69c50 100644
--- a/Source/cmExportInstallFileGenerator.cxx
+++ b/Source/cmExportInstallFileGenerator.cxx
@@ -290,6 +290,7 @@ bool cmExportInstallFileGenerator::GenerateImportFileConfig(
     cmSystemTools::Error(e.str());
     return false;
   }
+  exportFileStream.SetCopyIfDifferent(true);
   std::ostream& os = exportFileStream;
 
   // Start with the import file header.
-- 
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