From 4d71bea02c5269c7648913e117d0863860139bd4 Mon Sep 17 00:00:00 2001
From: Rolf Eike Beer <eb@emlix.com>
Date: Mon, 9 Sep 2019 08:15:29 +0200
Subject: cmLocalGenerator::AddConfigVariableFlags: optimize string
 construction

---
 Source/cmLocalGenerator.cxx | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 9152e94..93b26ed 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -2089,12 +2089,11 @@ void cmLocalGenerator::AddConfigVariableFlags(std::string& flags,
                                               const std::string& config)
 {
   // Add the flags from the variable itself.
-  std::string flagsVar = var;
-  this->AppendFlags(flags, this->Makefile->GetSafeDefinition(flagsVar));
+  this->AppendFlags(flags, this->Makefile->GetSafeDefinition(var));
   // Add the flags from the build-type specific variable.
   if (!config.empty()) {
-    flagsVar += "_";
-    flagsVar += cmSystemTools::UpperCase(config);
+    const std::string flagsVar =
+      cmStrCat(var, '_', cmSystemTools::UpperCase(config));
     this->AppendFlags(flags, this->Makefile->GetSafeDefinition(flagsVar));
   }
 }
-- 
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