From f45c16e7ee562f9918b75134b54b92661c5a98c8 Mon Sep 17 00:00:00 2001
From: Matthew Woehlke <matthew.woehlke@kitware.com>
Date: Thu, 5 May 2016 11:33:56 -0400
Subject: [PATCH] Fix export file variable pollution

Add missing unset of scratch variables to generated export file for case
that the file was already included. We already unset these when parsing
the file normally, but the multiple inclusion case was leaving them
around.
---
 Source/cmExportFileGenerator.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index 2b3ce148c..89a8f6c78 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -1040,6 +1040,9 @@ void cmExportFileGenerator::GenerateExpectedTargetsCode(std::ostream& os,
         "  endif()\n"
         "endforeach()\n"
         "if(\"${_targetsDefined}\" STREQUAL \"${_expectedTargets}\")\n"
+        "  unset(_targetsDefined)\n"
+        "  unset(_targetsNotDefined)\n"
+        "  unset(_expectedTargets)\n"
         "  set(CMAKE_IMPORT_FILE_VERSION)\n"
         "  cmake_policy(POP)\n"
         "  return()\n"