From 01e666c70e9c83ebd8c200d121b706868f69e617 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Sat, 29 Aug 2015 18:32:24 +0200
Subject: cmTarget: Join strings conditionally.

---
 Source/cmTarget.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index bb44956..7fd8d86 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -768,9 +768,9 @@ void cmTarget::GetSourceFiles(std::vector<cmSourceFile*> &files,
 //----------------------------------------------------------------------------
 void cmTarget::AddTracedSources(std::vector<std::string> const& srcs)
 {
-  std::string srcFiles = cmJoin(srcs, ";");
-  if (!srcFiles.empty())
+  if (!srcs.empty())
     {
+    std::string srcFiles = cmJoin(srcs, ";");
     this->Internal->SourceFilesMap.clear();
     this->LinkImplementationLanguageIsContextDependent = true;
     cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
-- 
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