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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"
+#include "cmSystemTools.h"
+
+class cmGeneratorTarget;
+
+// Basic information about each link item.
+class cmLinkItem : public std::string
+{
+  typedef std::string std_string;
+
+public:
+  cmLinkItem()
+    : std_string()
+    , Target(CM_NULLPTR)
+  {
+  }
+  cmLinkItem(const std_string& n, cmGeneratorTarget const* t)
+    : std_string(n)
+    , Target(t)
+  {
+  }
+  cmLinkItem(cmLinkItem const& r)
+    : std_string(r)
+    , Target(r.Target)
+  {
+  }
+  cmGeneratorTarget const* Target;
+};
+
+class cmLinkImplItem : public cmLinkItem
+{
+public:
+  cmLinkImplItem()
+    : cmLinkItem()
+    , Backtrace()
+    , FromGenex(false)
+  {
+  }
+  cmLinkImplItem(std::string const& n, cmGeneratorTarget 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.
+  unsigned 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(CM_NULLPTR)
+  {
+  }
+  bool LibrariesDone;
+  bool AllDone;
+  bool Exists;
+  bool HadHeadSensitiveCondition;
+  const char* ExplicitLibraries;
+};
+
+struct cmHeadToLinkInterfaceMap
+  : public std::map<cmGeneratorTarget 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;
+};
+
+/** Compute the link type to use for the given configuration.  */
+inline cmTargetLinkLibraryType CMP0003_ComputeLinkType(
+  const std::string& config, std::vector<std::string> const& debugConfigs)
+{
+  // No configuration is always optimized.
+  if (config.empty()) {
+    return OPTIMIZED_LibraryType;
+  }
+
+  // Check if any entry in the list matches this configuration.
+  std::string configUpper = cmSystemTools::UpperCase(config);
+  if (std::find(debugConfigs.begin(), debugConfigs.end(), configUpper) !=
+      debugConfigs.end()) {
+    return DEBUG_LibraryType;
+  }
+  // The current configuration is not a debug configuration.
+  return OPTIMIZED_LibraryType;
+}
+
+#endif