From 5d8f1a8421367aab8fc81b43a8f999862aa42190 Mon Sep 17 00:00:00 2001
From: Robert Maynard <robert.maynard@kitware.com>
Date: Mon, 17 Jun 2019 17:30:34 -0400
Subject: Export: A singular CMake version written for interface targets

---
 Source/cmExportBuildFileGenerator.cxx | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Source/cmExportBuildFileGenerator.cxx b/Source/cmExportBuildFileGenerator.cxx
index 012355b..3fe84a9 100644
--- a/Source/cmExportBuildFileGenerator.cxx
+++ b/Source/cmExportBuildFileGenerator.cxx
@@ -45,6 +45,7 @@ bool cmExportBuildFileGenerator::GenerateMainFile(std::ostream& os)
     std::string expectedTargets;
     std::string sep;
     std::vector<std::string> targets;
+    bool generatedInterfaceRequired = false;
     this->GetTargets(targets);
     for (std::string const& tei : targets) {
       cmGeneratorTarget* te = this->LG->FindGeneratorTargetToUse(tei);
@@ -60,11 +61,13 @@ bool cmExportBuildFileGenerator::GenerateMainFile(std::ostream& os)
           this->LG->GetMakefile()->GetBacktrace());
         return false;
       }
-      if (this->GetExportTargetType(te) == cmStateEnums::INTERFACE_LIBRARY) {
-        this->GenerateRequiredCMakeVersion(os, "3.0.0");
-      }
+      generatedInterfaceRequired |=
+        this->GetExportTargetType(te) == cmStateEnums::INTERFACE_LIBRARY;
     }
 
+    if (generatedInterfaceRequired) {
+      this->GenerateRequiredCMakeVersion(os, "3.0.0");
+    }
     this->GenerateExpectedTargetsCode(os, expectedTargets);
   }
 
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