Windows: Add experimental WindowsKernelModeDriver platform

Modules/Platform/Windows-MSVC.cmake

@@ -28,6 +28,8 @@ endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "WindowsCE")
   set(_PLATFORM_LINK_FLAGS " /subsystem:windowsce")
+elseif(CMAKE_SYSTEM_NAME STREQUAL "WindowsKernelModeDriver")
+  set(_PLATFORM_LINK_FLAGS " -subsystem:native -kernel -MANIFEST:NO")
 else()
   set(_PLATFORM_LINK_FLAGS "")
 endif()
@@ -223,6 +225,18 @@ elseif(WINDOWS_PHONE OR WINDOWS_STORE)
   else()
     set(CMAKE_C_STANDARD_LIBRARIES_INIT "kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib")
   endif()
+elseif(CMAKE_SYSTEM_NAME STREQUAL "WindowsKernelModeDriver")
+  set(CMAKE_C_STANDARD_LIBRARIES_INIT "")
+  set(_FLAGS_C   " -kernel")
+  set(_FLAGS_CXX " -kernel")
+  foreach(t EXE SHARED MODULE)
+    string(APPEND CMAKE_${t}_LINKER_FLAGS_INIT " -NODEFAULTLIB")
+  endforeach()
+  if((_MSVC_C_ARCHITECTURE_FAMILY STREQUAL "x64") OR (_MSVC_CXX_ARCHITECTURE_FAMILY STREQUAL "x64"))
+    set(_PLATFORM_DEFINES "${_PLATFORM_DEFINES} -D_AMD64_ -DAMD64")
+  elseif((_MSVC_C_ARCHITECTURE_FAMILY STREQUAL "ARM64") OR (_MSVC_CXX_ARCHITECTURE_FAMILY STREQUAL "ARM64"))
+    set(_PLATFORM_DEFINES "${_PLATFORM_DEFINES} -D_ARM64_ -DARM64")
+  endif()
 else()
   set(_PLATFORM_DEFINES "/DWIN32")
   if((_MSVC_C_ARCHITECTURE_FAMILY STREQUAL "ARM64EC") OR (_MSVC_CXX_ARCHITECTURE_FAMILY STREQUAL "ARM64EC"))
@@ -294,7 +308,7 @@ endif()
 # add /debug and /INCREMENTAL:YES to DEBUG and RELWITHDEBINFO also add pdbtype
 # on versions that support it
 set( MSVC_INCREMENTAL_YES_FLAG "")
-if(NOT WINDOWS_PHONE AND NOT WINDOWS_STORE)
+if(NOT WINDOWS_PHONE AND NOT WINDOWS_STORE AND NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsKernelModeDriver")
   if(NOT MSVC_INCREMENTAL_DEFAULT)
     set( MSVC_INCREMENTAL_YES_FLAG "/INCREMENTAL:YES")
   else()
@@ -353,8 +367,14 @@ macro(__windows_compiler_msvc lang)
     set(_CMAKE_VS_LINK_DLL "<CMAKE_COMMAND> -E vs_link_dll --intdir=<OBJECT_DIR> --rc=<CMAKE_RC_COMPILER> --mt=<CMAKE_MT> --manifests <MANIFESTS> -- ")
     set(_CMAKE_VS_LINK_EXE "<CMAKE_COMMAND> -E vs_link_exe --intdir=<OBJECT_DIR> --rc=<CMAKE_RC_COMPILER> --mt=<CMAKE_MT> --manifests <MANIFESTS> -- ")
   endif()
+  if(CMAKE_SYSTEM_NAME STREQUAL "WindowsKernelModeDriver")
+    set(_DLL_DRIVER "-driver")
+  else()
+    set(_DLL_DRIVER "/dll")
+  endif()
   set(CMAKE_${lang}_CREATE_SHARED_LIBRARY
-    "${_CMAKE_VS_LINK_DLL}<CMAKE_LINKER> ${CMAKE_CL_NOLOGO} <OBJECTS> ${CMAKE_START_TEMP_FILE} /out:<TARGET> /implib:<TARGET_IMPLIB> /pdb:<TARGET_PDB> /dll /version:<TARGET_VERSION_MAJOR>.<TARGET_VERSION_MINOR>${_PLATFORM_LINK_FLAGS} <LINK_FLAGS> <LINK_LIBRARIES> ${CMAKE_END_TEMP_FILE}")
+    "${_CMAKE_VS_LINK_DLL}<CMAKE_LINKER> ${CMAKE_CL_NOLOGO} <OBJECTS> ${CMAKE_START_TEMP_FILE} /out:<TARGET> /implib:<TARGET_IMPLIB> /pdb:<TARGET_PDB> ${_DLL_DRIVER} /version:<TARGET_VERSION_MAJOR>.<TARGET_VERSION_MINOR>${_PLATFORM_LINK_FLAGS} <LINK_FLAGS> <LINK_LIBRARIES> ${CMAKE_END_TEMP_FILE}")
+  unset(_DLL_DRIVER)
 
   set(CMAKE_${lang}_CREATE_SHARED_MODULE ${CMAKE_${lang}_CREATE_SHARED_LIBRARY})
   set(CMAKE_${lang}_CREATE_STATIC_LIBRARY  "<CMAKE_AR> ${CMAKE_CL_NOLOGO} <LINK_FLAGS> /out:<TARGET> <OBJECTS> ")

Modules/Platform/Windows.cmake

@@ -1,7 +1,11 @@
 set(CMAKE_STATIC_LIBRARY_PREFIX "")
 set(CMAKE_STATIC_LIBRARY_SUFFIX ".lib")
 set(CMAKE_SHARED_LIBRARY_PREFIX "")          # lib
-set(CMAKE_SHARED_LIBRARY_SUFFIX ".dll")          # .so
+if(CMAKE_SYSTEM_NAME STREQUAL "WindowsKernelModeDriver")
+  set(CMAKE_SHARED_LIBRARY_SUFFIX ".sys")          # .so
+else()
+  set(CMAKE_SHARED_LIBRARY_SUFFIX ".dll")          # .so
+endif()
 set(CMAKE_IMPORT_LIBRARY_PREFIX "")
 set(CMAKE_IMPORT_LIBRARY_SUFFIX ".lib")
 set(CMAKE_EXECUTABLE_SUFFIX ".exe")          # .exe

Modules/Platform/WindowsKernelModeDriver-Initialize.cmake

@@ -0,0 +1,11 @@
+# undocumented, do not use outside of CMake
+cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED "WindowsKernelModeDriver" _cmake_windows_kernel_mode_driver_enabled)
+if(NOT _cmake_windows_kernel_mode_driver_enabled)
+  message(FATAL_ERROR "Windows kernel-mode driver experimental support is not enabled.")
+endif()
+
+if(CMAKE_GENERATOR MATCHES "Visual Studio")
+  message(FATAL_ERROR "Visual Studio generators do not yet support CMAKE_SYSTEM_NAME=WindowsKernelModeDriver.")
+endif()
+
+set(_CMAKE_FEATURE_DETECTION_TARGET_TYPE STATIC_LIBRARY)

Modules/Platform/WindowsKernelModeDriver-MSVC-C.cmake

@@ -0,0 +1 @@
+include(Platform/Windows-MSVC-C)

Modules/Platform/WindowsKernelModeDriver-MSVC-CXX.cmake

@@ -0,0 +1 @@
+include(Platform/Windows-MSVC-CXX)

Modules/Platform/WindowsKernelModeDriver.cmake

@@ -0,0 +1 @@
+include(Platform/Windows)

Source/cmExperimental.cxx

@@ -26,6 +26,12 @@ cmExperimental::FeatureData LookupTable[] = {
     "experimentation and feedback to CMake developers.",
     false, // https://gitlab.kitware.com/cmake/cmake/-/issues/25097
     false },
+  // WindowsKernelModeDriver
+  { "WindowsKernelModeDriver", "5c2d848d-4efa-4529-a768-efd57171bf68",
+    "CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER",
+    "CMake's Windows kernel-mode driver support is experimental. It is meant "
+    "only for experimentation and feedback to CMake developers.",
+    true, false },
 };
 static_assert(sizeof(LookupTable) / sizeof(LookupTable[0]) ==
                 static_cast<size_t>(cmExperimental::Feature::Sentinel),

Source/cmExperimental.h

@@ -15,6 +15,7 @@ public:
   enum class Feature
   {
     CxxModuleCMakeApi,
+    WindowsKernelModeDriver,
 
     Sentinel,
   };