cmExperimental: remove the flag for Windows Kernel Mode Driver support

Enable setting `CMAKE_SYSTEM_NAME` to `WindowsKernelModeDriver` without
an experimental gate.

Modules/Platform/WindowsKernelModeDriver-Initialize.cmake

@@ -1,7 +1 @@
-# 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()
-
 set(_CMAKE_FEATURE_DETECTION_TARGET_TYPE STATIC_LIBRARY)

Source/cmExperimental.cxx

@@ -29,14 +29,6 @@ cmExperimental::FeatureData const LookupTable[] = {
     "only for experimentation and feedback to CMake developers.",
     {},
     cmExperimental::TryCompileCondition::Always },
-  // WindowsKernelModeDriver
-  { "WindowsKernelModeDriver",
-    "9157bf90-2313-44d6-aefa-67cd83c8be7c",
-    "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.",
-    {},
-    cmExperimental::TryCompileCondition::Always },
   // CxxImportStd
   { "CxxImportStd",
     "d0edc3af-4c50-42ea-a356-e2862fe7a444",

Source/cmExperimental.h

@@ -18,7 +18,6 @@ public:
   enum class Feature
   {
     ExportPackageDependencies,
-    WindowsKernelModeDriver,
     CxxImportStd,
     ImportPackageInfo,
     ExportPackageInfo,

Source/cmGlobalVisualStudio10Generator.cxx

@@ -478,9 +478,7 @@ bool cmGlobalVisualStudio10Generator::InitializeSystem(cmMakefile* mf)
     if (!this->InitializeWindowsStore(mf)) {
       return false;
     }
-  } else if (this->SystemName == "WindowsKernelModeDriver"_s &&
+  } else if (this->SystemName == "WindowsKernelModeDriver"_s) {
-             cmExperimental::HasSupportEnabled(
-               *mf, cmExperimental::Feature::WindowsKernelModeDriver)) {
     this->SystemIsWindowsKernelModeDriver = true;
     if (!this->InitializeWindowsKernelModeDriver(mf)) {
       return false;

Tests/RunCMake/cmake_language/Experimental/WindowsKernelModeDriver-set-stderr.txt

@@ -1,6 +0,0 @@
-^CMake Warning \(dev\) at Experimental/WindowsKernelModeDriver-set.cmake:4 \(cmake_language\):
-  CMake's Windows kernel-mode driver support is experimental.  It is meant
-  only for experimentation and feedback to CMake developers.
-Call Stack \(most recent call first\):
-  CMakeLists.txt:[0-9]+ \(include\)
-This warning is for project developers.  Use -Wno-dev to suppress it.$

Tests/RunCMake/cmake_language/Experimental/WindowsKernelModeDriver-set.cmake

@@ -1,11 +0,0 @@
-set(CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER
-  "9157bf90-2313-44d6-aefa-67cd83c8be7c")
-
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-  "WindowsKernelModeDriver"
-  feature_present)
-
-if (NOT feature_present STREQUAL "TRUE")
-  message(FATAL_ERROR
-    "Expected the `WindowsKernelModeDriver` feature to be enabled.")
-endif ()

Tests/RunCMake/cmake_language/Experimental/WindowsKernelModeDriver-unset.cmake

@@ -1,8 +0,0 @@
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-  "WindowsKernelModeDriver"
-  feature_present)
-
-if (NOT feature_present STREQUAL "FALSE")
-  message(FATAL_ERROR
-    "Expected the `WindowsKernelModeDriver` feature to be disabled.")
-endif ()

Tests/RunCMake/cmake_language/Experimental/WindowsKernelModeDriver-wrong-stderr.txt

@@ -1,25 +0,0 @@
-^CMake Warning \(dev\) at Experimental/WindowsKernelModeDriver-wrong\.cmake:4 \(cmake_language\):
-  CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER is set to incorrect value
-
-    01234567-0123-0123-0123-0123456789ab
-
-  See 'Help/dev/experimental\.rst' in the source tree of this version of CMake
-  for documentation of the experimental feature and the corresponding
-  activation value\.  This project's code may require changes to work with
-  this CMake's version of the feature\.
-Call Stack \(most recent call first\):
-  CMakeLists\.txt:[0-9]+ \(include\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.
-+
-CMake Warning \(dev\) at Experimental/WindowsKernelModeDriver-wrong\.cmake:19 \(cmake_language\):
-  CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER is set to incorrect value
-
-    76543210-3210-3210-3210-ba9876543210
-
-  See 'Help/dev/experimental\.rst' in the source tree of this version of CMake
-  for documentation of the experimental feature and the corresponding
-  activation value\.  This project's code may require changes to work with
-  this CMake's version of the feature\.
-Call Stack \(most recent call first\):
-  CMakeLists\.txt:[0-9]+ \(include\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.$

Tests/RunCMake/cmake_language/Experimental/WindowsKernelModeDriver-wrong.cmake

@@ -1,21 +0,0 @@
-set(CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER
-  "01234567-0123-0123-0123-0123456789ab")
-
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-  "WindowsKernelModeDriver"
-  feature_present)
-
-if (NOT feature_present STREQUAL "FALSE")
-  message(FATAL_ERROR
-    "Expected the `WindowsKernelModeDriver` feature to be disabled.")
-endif ()
-
-# Test if/when warning is repeated.
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-  "WindowsKernelModeDriver"
-  feature_present)
-set(CMAKE_EXPERIMENTAL_WINDOWS_KERNEL_MODE_DRIVER
-  "76543210-3210-3210-3210-ba9876543210")
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-  "WindowsKernelModeDriver"
-  feature_present)

Tests/RunCMake/cmake_language/RunCMakeTest.cmake

@@ -163,7 +163,4 @@ run_cmake(Experimental/CxxImportStd-wrong)
 run_cmake(Experimental/ExportPackageDependencies-set)
 run_cmake(Experimental/ExportPackageDependencies-unset)
 run_cmake(Experimental/ExportPackageDependencies-wrong)
-run_cmake(Experimental/WindowsKernelModeDriver-set)
-run_cmake(Experimental/WindowsKernelModeDriver-unset)
-run_cmake(Experimental/WindowsKernelModeDriver-wrong)
 run_cmake(Experimental/Unknown)