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diff --git a/Source/cmLinkItem.h b/Source/cmLinkItem.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2004-2015 Kitware, Inc.
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+
+#ifndef cmLinkItem_h
+#define cmLinkItem_h
+
+#include "cmListFileCache.h"
+
+class cmTarget;
+
+// Basic information about each link item.
+class cmLinkItem: public std::string
+{
+  typedef std::string std_string;
+public:
+  cmLinkItem(): std_string(), Target(0) {}
+  cmLinkItem(const std_string& n,
+             cmTarget const* t): std_string(n), Target(t) {}
+  cmLinkItem(cmLinkItem const& r): std_string(r), Target(r.Target) {}
+  cmTarget const* Target;
+};
+
+class cmLinkImplItem: public cmLinkItem
+{
+public:
+  cmLinkImplItem(): cmLinkItem(), Backtrace(), FromGenex(false) {}
+  cmLinkImplItem(std::string const& n,
+                 cmTarget const* t,
+                 cmListFileBacktrace const& bt,
+                 bool fromGenex):
+    cmLinkItem(n, t), Backtrace(bt), FromGenex(fromGenex) {}
+  cmLinkImplItem(cmLinkImplItem const& r):
+    cmLinkItem(r), Backtrace(r.Backtrace), FromGenex(r.FromGenex) {}
+  cmListFileBacktrace Backtrace;
+  bool FromGenex;
+};
+
+/** The link implementation specifies the direct library
+    dependencies needed by the object files of the target.  */
+struct cmLinkImplementationLibraries
+{
+  // Libraries linked directly in this configuration.
+  std::vector<cmLinkImplItem> Libraries;
+
+  // Libraries linked directly in other configurations.
+  // Needed only for OLD behavior of CMP0003.
+  std::vector<cmLinkItem> WrongConfigLibraries;
+};
+
+struct cmLinkInterfaceLibraries
+{
+  // Libraries listed in the interface.
+  std::vector<cmLinkItem> Libraries;
+};
+
+struct cmLinkInterface: public cmLinkInterfaceLibraries
+{
+  // Languages whose runtime libraries must be linked.
+  std::vector<std::string> Languages;
+
+  // Shared library dependencies needed for linking on some platforms.
+  std::vector<cmLinkItem> SharedDeps;
+
+  // Number of repetitions of a strongly connected component of two
+  // or more static libraries.
+  int Multiplicity;
+
+  // Libraries listed for other configurations.
+  // Needed only for OLD behavior of CMP0003.
+  std::vector<cmLinkItem> WrongConfigLibraries;
+
+  bool ImplementationIsInterface;
+
+  cmLinkInterface(): Multiplicity(0), ImplementationIsInterface(false) {}
+};
+
+struct cmOptionalLinkInterface: public cmLinkInterface
+{
+  cmOptionalLinkInterface():
+    LibrariesDone(false), AllDone(false),
+    Exists(false), HadHeadSensitiveCondition(false),
+    ExplicitLibraries(0) {}
+  bool LibrariesDone;
+  bool AllDone;
+  bool Exists;
+  bool HadHeadSensitiveCondition;
+  const char* ExplicitLibraries;
+};
+
+struct cmHeadToLinkInterfaceMap:
+    public std::map<cmTarget const*, cmOptionalLinkInterface>
+{
+};
+
+struct cmLinkImplementation: public cmLinkImplementationLibraries
+{
+  // Languages whose runtime libraries must be linked.
+  std::vector<std::string> Languages;
+};
+
+// Cache link implementation computation from each configuration.
+struct cmOptionalLinkImplementation: public cmLinkImplementation
+{
+  cmOptionalLinkImplementation():
+    LibrariesDone(false), LanguagesDone(false),
+    HadHeadSensitiveCondition(false) {}
+  bool LibrariesDone;
+  bool LanguagesDone;
+  bool HadHeadSensitiveCondition;
+};
+
+#endif