Modernize: Use #pragma once in all header files

#pragma once is a widely supported compiler pragma, even though it is
not part of the C++ standard. Many of the issues keeping #pragma once
from being standardized (distributed filesystems, build farms, hard
links, etc.) do not apply to CMake - it is easy to build CMake on a
single machine. CMake also does not install any header files which can
be consumed by other projects (though cmCPluginAPI.h has been
deliberately omitted from this conversion in case anyone is still using
it.) Finally, #pragma once has been required to build CMake since at
least August 2017 (7f29bbe6 enabled server mode unconditionally, which
had been using #pragma once since September 2016 (b13d3e0d)). The fact
that we now require C++11 filters out old compilers, and it is unlikely
that there is a compiler which supports C++11 but does not support
#pragma once.

36 files changed, 36 insertions, 144 deletions

diff --git a/Source/CPack/IFW/cmCPackIFWCommon.h b/Source/CPack/IFW/cmCPackIFWCommon.h
index 354d849..95ed213 100644
--- a/Source/CPack/IFW/cmCPackIFWCommon.h
+++ b/Source/CPack/IFW/cmCPackIFWCommon.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackIFWCommon_h
-#define cmCPackIFWCommon_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -77,5 +76,3 @@ protected:
                              cmCPackLog_msg.str().c_str());                   \
     }                                                                         \
   } while (false)
-
-#endif // cmCPackIFWCommon_h
diff --git a/Source/CPack/IFW/cmCPackIFWGenerator.h b/Source/CPack/IFW/cmCPackIFWGenerator.h
index 86a73c8..024d25d 100644
--- a/Source/CPack/IFW/cmCPackIFWGenerator.h
+++ b/Source/CPack/IFW/cmCPackIFWGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackIFWGenerator_h
-#define cmCPackIFWGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -152,5 +151,3 @@ private:
   std::vector<std::string> PkgsDirsVector;
   std::vector<std::string> RepoDirsVector;
 };
-
-#endif
diff --git a/Source/CPack/IFW/cmCPackIFWInstaller.h b/Source/CPack/IFW/cmCPackIFWInstaller.h
index 8b3f96a..6f398e3 100644
--- a/Source/CPack/IFW/cmCPackIFWInstaller.h
+++ b/Source/CPack/IFW/cmCPackIFWInstaller.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackIFWInstaller_h
-#define cmCPackIFWInstaller_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -132,5 +131,3 @@ protected:
   void printSkippedOptionWarning(const std::string& optionName,
                                  const std::string& optionValue);
 };
-
-#endif // cmCPackIFWInstaller_h
diff --git a/Source/CPack/IFW/cmCPackIFWPackage.h b/Source/CPack/IFW/cmCPackIFWPackage.h
index 6a4a170..dbd5540 100644
--- a/Source/CPack/IFW/cmCPackIFWPackage.h
+++ b/Source/CPack/IFW/cmCPackIFWPackage.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackIFWPackage_h
-#define cmCPackIFWPackage_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -149,5 +148,3 @@ public:
   // Patch to package directory
   std::string Directory;
 };
-
-#endif // cmCPackIFWPackage_h
diff --git a/Source/CPack/IFW/cmCPackIFWRepository.h b/Source/CPack/IFW/cmCPackIFWRepository.h
index c293981..21afd8b 100644
--- a/Source/CPack/IFW/cmCPackIFWRepository.h
+++ b/Source/CPack/IFW/cmCPackIFWRepository.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackIFWRepository_h
-#define cmCPackIFWRepository_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -84,5 +83,3 @@ public:
   RepositoriesVector RepositoryUpdate;
   std::string Directory;
 };
-
-#endif // cmCPackIFWRepository_h
diff --git a/Source/CPack/WiX/cmCMakeToWixPath.h b/Source/CPack/WiX/cmCMakeToWixPath.h
index 8bb9e04..074cc8e 100644
--- a/Source/CPack/WiX/cmCMakeToWixPath.h
+++ b/Source/CPack/WiX/cmCMakeToWixPath.h
@@ -1,12 +1,9 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCMakeToWixPath_h
-#define cmCMakeToWixPath_h
+#pragma once
 
 #include "cmConfigure.h" //IWYU pragma: keep
 
 #include <string>
 
 std::string CMakeToWixPath(const std::string& cygpath);
-
-#endif // cmCMakeToWixPath_h
diff --git a/Source/CPack/WiX/cmCPackWIXGenerator.h b/Source/CPack/WiX/cmCPackWIXGenerator.h
index b9c37e9..8609cf3 100644
--- a/Source/CPack/WiX/cmCPackWIXGenerator.h
+++ b/Source/CPack/WiX/cmCPackWIXGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackWIXGenerator_h
-#define cmCPackWIXGenerator_h
+#pragma once
 
 #include <map>
 #include <memory>
@@ -171,5 +170,3 @@ private:
 
   cmWIXSourceWriter::GuidType ComponentGuidType;
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXAccessControlList.h b/Source/CPack/WiX/cmWIXAccessControlList.h
index 64f9a13..ee5efa5 100644
--- a/Source/CPack/WiX/cmWIXAccessControlList.h
+++ b/Source/CPack/WiX/cmWIXAccessControlList.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXAccessControlList_h
-#define cmWIXAccessControlList_h
+#pragma once
 
 #include "cmCPackLog.h"
 #include "cmInstalledFile.h"
@@ -29,5 +28,3 @@ private:
   cmInstalledFile const& InstalledFile;
   cmWIXSourceWriter& SourceWriter;
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXDirectoriesSourceWriter.h b/Source/CPack/WiX/cmWIXDirectoriesSourceWriter.h
index a907d6d..0af3094 100644
--- a/Source/CPack/WiX/cmWIXDirectoriesSourceWriter.h
+++ b/Source/CPack/WiX/cmWIXDirectoriesSourceWriter.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXDirectoriesSourceWriter_h
-#define cmWIXDirectoriesSourceWriter_h
+#pragma once
 
 #include <string>
 
@@ -29,5 +28,3 @@ public:
 
   void EndInstallationPrefixDirectory(size_t size);
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXFeaturesSourceWriter.h b/Source/CPack/WiX/cmWIXFeaturesSourceWriter.h
index e03e87b..0facf97 100644
--- a/Source/CPack/WiX/cmWIXFeaturesSourceWriter.h
+++ b/Source/CPack/WiX/cmWIXFeaturesSourceWriter.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXFeaturesSourceWriter_h
-#define cmWIXFeaturesSourceWriter_h
+#pragma once
 
 #include "cmCPackGenerator.h"
 #include "cmWIXPatch.h"
@@ -27,5 +26,3 @@ public:
 
   void EmitComponentRef(std::string const& id);
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXFilesSourceWriter.h b/Source/CPack/WiX/cmWIXFilesSourceWriter.h
index 8cc98f5..60dddd4 100644
--- a/Source/CPack/WiX/cmWIXFilesSourceWriter.h
+++ b/Source/CPack/WiX/cmWIXFilesSourceWriter.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXFilesSourceWriter_h
-#define cmWIXFilesSourceWriter_h
+#pragma once
 
 #include "cmCPackGenerator.h"
 #include "cmWIXPatch.h"
@@ -37,5 +36,3 @@ public:
                                 std::string const& filePath, cmWIXPatch& patch,
                                 cmInstalledFile const* installedFile);
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXPatch.h b/Source/CPack/WiX/cmWIXPatch.h
index 31a60f4..c78722d 100644
--- a/Source/CPack/WiX/cmWIXPatch.h
+++ b/Source/CPack/WiX/cmWIXPatch.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXPatch_h
-#define cmWIXPatch_h
+#pragma once
 
 #include <string>
 
@@ -33,5 +32,3 @@ private:
 
   cmWIXPatchParser::fragment_map_t Fragments;
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXPatchParser.h b/Source/CPack/WiX/cmWIXPatchParser.h
index 8d5d2ad..70a21bc 100644
--- a/Source/CPack/WiX/cmWIXPatchParser.h
+++ b/Source/CPack/WiX/cmWIXPatchParser.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackWIXPatchParser_h
-#define cmCPackWIXPatchParser_h
+#pragma once
 
 #include <map>
 #include <memory>
@@ -91,5 +90,3 @@ private:
 
   std::vector<cmWIXPatchElement*> ElementStack;
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXRichTextFormatWriter.h b/Source/CPack/WiX/cmWIXRichTextFormatWriter.h
index a879f3d..99471f1 100644
--- a/Source/CPack/WiX/cmWIXRichTextFormatWriter.h
+++ b/Source/CPack/WiX/cmWIXRichTextFormatWriter.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXRichTextFormatWriter_h
-#define cmWIXRichTextFormatWriter_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -42,5 +41,3 @@ private:
 
   cmsys::ofstream File;
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXShortcut.h b/Source/CPack/WiX/cmWIXShortcut.h
index c67baf3..315b5ea 100644
--- a/Source/CPack/WiX/cmWIXShortcut.h
+++ b/Source/CPack/WiX/cmWIXShortcut.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXShortcut_h
-#define cmWIXShortcut_h
+#pragma once
 
 #include <map>
 #include <set>
@@ -56,5 +55,3 @@ private:
   shortcut_type_map_t Shortcuts;
   shortcut_id_map_t EmptyIdMap;
 };
-
-#endif
diff --git a/Source/CPack/WiX/cmWIXSourceWriter.h b/Source/CPack/WiX/cmWIXSourceWriter.h
index 6030ea3..f643acd 100644
--- a/Source/CPack/WiX/cmWIXSourceWriter.h
+++ b/Source/CPack/WiX/cmWIXSourceWriter.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmWIXSourceWriter_h
-#define cmWIXSourceWriter_h
+#pragma once
 
 #include <string>
 #include <vector>
@@ -76,5 +75,3 @@ private:
 
   GuidType ComponentGuidType;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackArchiveGenerator.h b/Source/CPack/cmCPackArchiveGenerator.h
index 7eb5665..5b40013 100644
--- a/Source/CPack/cmCPackArchiveGenerator.h
+++ b/Source/CPack/cmCPackArchiveGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackArchiveGenerator_h
-#define cmCPackArchiveGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -93,5 +92,3 @@ private:
   std::string ArchiveFormat;
   std::string OutputExtension;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackBundleGenerator.h b/Source/CPack/cmCPackBundleGenerator.h
index 27bac3a..072d14f 100644
--- a/Source/CPack/cmCPackBundleGenerator.h
+++ b/Source/CPack/cmCPackBundleGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackBundleGenerator_h
-#define cmCPackBundleGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -33,5 +32,3 @@ protected:
 
   std::string InstallPrefix;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackComponentGroup.h b/Source/CPack/cmCPackComponentGroup.h
index bb980d7..58377d4 100644
--- a/Source/CPack/cmCPackComponentGroup.h
+++ b/Source/CPack/cmCPackComponentGroup.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackComponentGroup_h
-#define cmCPackComponentGroup_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -167,5 +166,3 @@ public:
   /// The list of components.
   std::vector<cmCPackComponent*> Components;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackCygwinBinaryGenerator.h b/Source/CPack/cmCPackCygwinBinaryGenerator.h
index 47bd41e..f5f7700 100644
--- a/Source/CPack/cmCPackCygwinBinaryGenerator.h
+++ b/Source/CPack/cmCPackCygwinBinaryGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackCygwinBinaryGenerator_h
-#define cmCPackCygwinBinaryGenerator_h
+#pragma once
 
 #include "cmCPackArchiveGenerator.h"
 
@@ -25,5 +24,3 @@ protected:
   virtual const char* GetOutputExtension();
   std::string OutputExtension;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackCygwinSourceGenerator.h b/Source/CPack/cmCPackCygwinSourceGenerator.h
index 98d8f0a..964a4d4 100644
--- a/Source/CPack/cmCPackCygwinSourceGenerator.h
+++ b/Source/CPack/cmCPackCygwinSourceGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackCygwinSourceGenerator_h
-#define cmCPackCygwinSourceGenerator_h
+#pragma once
 
 #include "cmCPackArchiveGenerator.h"
 
@@ -27,5 +26,3 @@ protected:
   std::string InstallPrefix;
   std::string OutputExtension;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackDebGenerator.h b/Source/CPack/cmCPackDebGenerator.h
index ce77e08..ee8f39a 100644
--- a/Source/CPack/cmCPackDebGenerator.h
+++ b/Source/CPack/cmCPackDebGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackDebGenerator_h
-#define cmCPackDebGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -69,5 +68,3 @@ private:
 
   std::vector<std::string> packageFiles;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackDragNDropGenerator.h b/Source/CPack/cmCPackDragNDropGenerator.h
index dbd190c..310b0ab 100644
--- a/Source/CPack/cmCPackDragNDropGenerator.h
+++ b/Source/CPack/cmCPackDragNDropGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackDragNDropGenerator_h
-#define cmCPackDragNDropGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -81,5 +80,3 @@ private:
   bool BreakLongLine(const std::string& line, std::vector<std::string>& lines,
                      std::string* error);
 };
-
-#endif
diff --git a/Source/CPack/cmCPackExternalGenerator.h b/Source/CPack/cmCPackExternalGenerator.h
index 80011fd..dfd13e8 100644
--- a/Source/CPack/cmCPackExternalGenerator.h
+++ b/Source/CPack/cmCPackExternalGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackExternalGenerator_h
-#define cmCPackExternalGenerator_h
+#pragma once
 
 #include <memory>
 #include <string>
@@ -86,5 +85,3 @@ private:
 
   std::unique_ptr<cmCPackExternalVersionGenerator> Generator;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackFreeBSDGenerator.h b/Source/CPack/cmCPackFreeBSDGenerator.h
index a18b72f..eed8053 100644
--- a/Source/CPack/cmCPackFreeBSDGenerator.h
+++ b/Source/CPack/cmCPackFreeBSDGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackFreeBSDGenerator_h
-#define cmCPackFreeBSDGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -33,5 +32,3 @@ protected:
   std::string var_lookup(const char* var_name);
   void write_manifest_fields(cmGeneratedFileStream&);
 };
-
-#endif
diff --git a/Source/CPack/cmCPackGenerator.h b/Source/CPack/cmCPackGenerator.h
index 33026c1..2512d42 100644
--- a/Source/CPack/cmCPackGenerator.h
+++ b/Source/CPack/cmCPackGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackGenerator_h
-#define cmCPackGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -339,5 +338,3 @@ protected:
     this->Logger->Log(logType, __FILE__, __LINE__,                            \
                       cmCPackLog_msg.str().c_str());                          \
   } while (false)
-
-#endif
diff --git a/Source/CPack/cmCPackGeneratorFactory.h b/Source/CPack/cmCPackGeneratorFactory.h
index 62b7484..0846573 100644
--- a/Source/CPack/cmCPackGeneratorFactory.h
+++ b/Source/CPack/cmCPackGeneratorFactory.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackGeneratorFactory_h
-#define cmCPackGeneratorFactory_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -44,5 +43,3 @@ private:
   DescriptionsMap GeneratorDescriptions;
   cmCPackLog* Logger;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackLog.h b/Source/CPack/cmCPackLog.h
index 68ffcce..6cec39c 100644
--- a/Source/CPack/cmCPackLog.h
+++ b/Source/CPack/cmCPackLog.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackLog_h
-#define cmCPackLog_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -139,5 +138,3 @@ inline std::ostream& operator<<(std::ostream& os, const cmCPackLogWrite& c)
   os.flush();
   return os;
 }
-
-#endif
diff --git a/Source/CPack/cmCPackNSISGenerator.h b/Source/CPack/cmCPackNSISGenerator.h
index 88cba45..ded02de 100644
--- a/Source/CPack/cmCPackNSISGenerator.h
+++ b/Source/CPack/cmCPackNSISGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackNSISGenerator_h
-#define cmCPackNSISGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -85,5 +84,3 @@ protected:
 
   bool Nsis64;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackNuGetGenerator.h b/Source/CPack/cmCPackNuGetGenerator.h
index a59db2d..609ec79 100644
--- a/Source/CPack/cmCPackNuGetGenerator.h
+++ b/Source/CPack/cmCPackNuGetGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackNuGetGenerator_h
-#define cmCPackNuGetGenerator_h
+#pragma once
 
 #include "cmCPackGenerator.h"
 
@@ -33,5 +32,3 @@ protected:
    */
   void AddGeneratedPackageNames();
 };
-
-#endif
diff --git a/Source/CPack/cmCPackOSXX11Generator.h b/Source/CPack/cmCPackOSXX11Generator.h
index a6461c8..8fae136 100644
--- a/Source/CPack/cmCPackOSXX11Generator.h
+++ b/Source/CPack/cmCPackOSXX11Generator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackOSXX11Generator_h
-#define cmCPackOSXX11Generator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -38,5 +37,3 @@ protected:
                              bool copyOnly = false);
   std::string InstallPrefix;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackPKGGenerator.h b/Source/CPack/cmCPackPKGGenerator.h
index be730ab..17cdcdf 100644
--- a/Source/CPack/cmCPackPKGGenerator.h
+++ b/Source/CPack/cmCPackPKGGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackPKGGenerator_h
-#define cmCPackPKGGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -94,5 +93,3 @@ protected:
   // The PostFlight component when creating a metapackage
   cmCPackComponent PostFlightComponent;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackPackageMakerGenerator.h b/Source/CPack/cmCPackPackageMakerGenerator.h
index 0575587..cda9277 100644
--- a/Source/CPack/cmCPackPackageMakerGenerator.h
+++ b/Source/CPack/cmCPackPackageMakerGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackPackageMakerGenerator_h
-#define cmCPackPackageMakerGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -49,5 +48,3 @@ protected:
   double PackageMakerVersion;
   unsigned int PackageCompatibilityVersion;
 };
-
-#endif
diff --git a/Source/CPack/cmCPackProductBuildGenerator.h b/Source/CPack/cmCPackProductBuildGenerator.h
index 015fe4a..462e2fc 100644
--- a/Source/CPack/cmCPackProductBuildGenerator.h
+++ b/Source/CPack/cmCPackProductBuildGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackProductBuildGenerator_h
-#define cmCPackProductBuildGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -49,5 +48,3 @@ protected:
   const char* GetComponentScript(const char* script,
                                  const char* script_component);
 };
-
-#endif
diff --git a/Source/CPack/cmCPackRPMGenerator.h b/Source/CPack/cmCPackRPMGenerator.h
index 075ce84..0288f2f 100644
--- a/Source/CPack/cmCPackRPMGenerator.h
+++ b/Source/CPack/cmCPackRPMGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackRPMGenerator_h
-#define cmCPackRPMGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -68,5 +67,3 @@ protected:
 
   void AddGeneratedPackageNames();
 };
-
-#endif
diff --git a/Source/CPack/cmCPackSTGZGenerator.h b/Source/CPack/cmCPackSTGZGenerator.h
index 79d7035..d2df1f2 100644
--- a/Source/CPack/cmCPackSTGZGenerator.h
+++ b/Source/CPack/cmCPackSTGZGenerator.h
@@ -1,7 +1,6 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
-#ifndef cmCPackSTGZGenerator_h
-#define cmCPackSTGZGenerator_h
+#pragma once
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
@@ -30,5 +29,3 @@ protected:
   int InitializeInternal() override;
   int GenerateHeader(std::ostream* os) override;
 };
-
-#endif