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diff --git a/Source/cmExtraEclipseCDT4Generator.h b/Source/cmExtraEclipseCDT4Generator.h
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+++ b/Source/cmExtraEclipseCDT4Generator.h
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+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmExtraEclipseCDT4Generator_h
+#define cmExtraEclipseCDT4Generator_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include "cmExternalMakefileProjectGenerator.h"
+
+#include <iosfwd>
+#include <set>
+#include <string>
+#include <vector>
+
+class cmLocalGenerator;
+class cmMakefile;
+class cmSourceGroup;
+class cmXMLWriter;
+
+/** \class cmExtraEclipseCDT4Generator
+ * \brief Write Eclipse project files for Makefile based projects
+ */
+class cmExtraEclipseCDT4Generator : public cmExternalMakefileProjectGenerator
+{
+public:
+  enum LinkType
+  {
+    VirtualFolder,
+    LinkToFolder,
+    LinkToFile
+  };
+
+  cmExtraEclipseCDT4Generator();
+
+  static cmExternalMakefileProjectGeneratorFactory* GetFactory();
+
+  void EnableLanguage(std::vector<std::string> const& languages, cmMakefile*,
+                      bool optional) override;
+
+  void Generate() override;
+
+private:
+  // create .project file in the source tree
+  void CreateSourceProjectFile();
+
+  // create .project file
+  void CreateProjectFile();
+
+  // create .cproject file
+  void CreateCProjectFile() const;
+
+  // If built with cygwin cmake, convert posix to windows path.
+  static std::string GetEclipsePath(const std::string& path);
+
+  // Extract basename.
+  static std::string GetPathBasename(const std::string& path);
+
+  // Generate the project name as: <name>-<type>@<path>
+  static std::string GenerateProjectName(const std::string& name,
+                                         const std::string& type,
+                                         const std::string& path);
+
+  // Helper functions
+  static void AppendStorageScanners(cmXMLWriter& xml,
+                                    const cmMakefile& makefile);
+  static void AppendTarget(cmXMLWriter& xml, const std::string& target,
+                           const std::string& make,
+                           const std::string& makeArguments,
+                           const std::string& path, const char* prefix = "",
+                           const char* makeTarget = nullptr);
+  static void AppendScannerProfile(
+    cmXMLWriter& xml, const std::string& profileID, bool openActionEnabled,
+    const std::string& openActionFilePath, bool pParserEnabled,
+    const std::string& scannerInfoProviderID,
+    const std::string& runActionArguments, const std::string& runActionCommand,
+    bool runActionUseDefault, bool sipParserEnabled);
+
+  static void AppendLinkedResource(cmXMLWriter& xml, const std::string& name,
+                                   const std::string& path, LinkType linkType);
+
+  static void AppendIncludeDirectories(
+    cmXMLWriter& xml, const std::vector<std::string>& includeDirs,
+    std::set<std::string>& emittedDirs);
+
+  static void AddEnvVar(std::ostream& out, const char* envVar,
+                        cmLocalGenerator* lg);
+
+  void WriteGroups(std::vector<cmSourceGroup> const& sourceGroups,
+                   std::string& linkName, cmXMLWriter& xml);
+  void CreateLinksToSubprojects(cmXMLWriter& xml, const std::string& baseDir);
+  void CreateLinksForTargets(cmXMLWriter& xml);
+
+  std::vector<std::string> SrcLinkedResources;
+  std::set<std::string> Natures;
+  std::string HomeDirectory;
+  std::string HomeOutputDirectory;
+  bool IsOutOfSourceBuild;
+  bool GenerateSourceProject;
+  bool GenerateLinkedResources;
+  bool SupportsVirtualFolders;
+  bool SupportsGmakeErrorParser;
+  bool SupportsMachO64Parser;
+  bool CEnabled;
+  bool CXXEnabled;
+};
+
+#endif