From 1449f6f63d09f21203b36b3485dd3eb60c73ac17 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 28 Mar 2017 12:56:29 -0400
Subject: cmVisualStudio10TargetGenerator: De-duplicate preprocessor defs

---
 Source/cmVisualStudioGeneratorOptions.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Source/cmVisualStudioGeneratorOptions.cxx b/Source/cmVisualStudioGeneratorOptions.cxx
index c0913e6..da6f9a7 100644
--- a/Source/cmVisualStudioGeneratorOptions.cxx
+++ b/Source/cmVisualStudioGeneratorOptions.cxx
@@ -1,5 +1,6 @@
 #include "cmVisualStudioGeneratorOptions.h"
 
+#include "cmAlgorithms.h"
 #include "cmLocalVisualStudioGenerator.h"
 #include "cmOutputConverter.h"
 #include "cmSystemTools.h"
@@ -267,8 +268,10 @@ void cmVisualStudioGeneratorOptions::OutputPreprocessorDefinitions(
     fout << prefix << "PreprocessorDefinitions=\"";
   }
   const char* sep = "";
+  std::vector<std::string>::const_iterator de =
+    cmRemoveDuplicates(this->Defines);
   for (std::vector<std::string>::const_iterator di = this->Defines.begin();
-       di != this->Defines.end(); ++di) {
+       di != de; ++di) {
     // Escape the definition for the compiler.
     std::string define;
     if (this->Version < cmGlobalVisualStudioGenerator::VS10) {
-- 
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