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diff --git a/Source/cmCommand.h b/Source/cmCommand.h
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+++ b/Source/cmCommand.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 cmCommand_h
+#define cmCommand_h
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <string>
+#include <vector>
+
+class cmExecutionStatus;
+class cmMakefile;
+struct cmListFileArgument;
+
+/** \class cmCommand
+ * \brief Superclass for all commands in CMake.
+ *
+ * cmCommand is the base class for all commands in CMake. A command
+ * manifests as an entry in CMakeLists.txt and produces one or
+ * more makefile rules. Commands are associated with a particular
+ * makefile. This base class cmCommand defines the API for commands
+ * to support such features as enable/disable, inheritance,
+ * documentation, and construction.
+ */
+class cmCommand
+{
+public:
+  /**
+   * Construct the command. By default it has no makefile.
+   */
+  cmCommand() = default;
+
+  /**
+   * Need virtual destructor to destroy real command type.
+   */
+  virtual ~cmCommand() = default;
+
+  cmCommand(cmCommand const&) = delete;
+  cmCommand& operator=(cmCommand const&) = delete;
+
+  /**
+   * Specify the makefile.
+   */
+  void SetMakefile(cmMakefile* m) { this->Makefile = m; }
+  cmMakefile* GetMakefile() { return this->Makefile; }
+
+  /**
+   * This is called by the cmMakefile when the command is first
+   * encountered in the CMakeLists.txt file.  It expands the command's
+   * arguments and then invokes the InitialPass.
+   */
+  virtual bool InvokeInitialPass(const std::vector<cmListFileArgument>& args,
+                                 cmExecutionStatus& status);
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args,
+                           cmExecutionStatus&) = 0;
+
+  /**
+   * This is called at the end after all the information
+   * specified by the command is accumulated. Most commands do
+   * not implement this method.  At this point, reading and
+   * writing to the cache can be done.
+   */
+  virtual void FinalPass() {}
+
+  /**
+   * Does this command have a final pass?  Query after InitialPass.
+   */
+  virtual bool HasFinalPass() const { return false; }
+
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() = 0;
+
+  /**
+   * Return the last error string.
+   */
+  const char* GetError();
+
+  /**
+   * Set the error message
+   */
+  void SetError(const std::string& e);
+
+protected:
+  cmMakefile* Makefile = nullptr;
+
+private:
+  std::string Error;
+};
+
+#endif