Experimental: Remove import std experimental gate

Fixes: #27571

Help/dev/experimental.rst

@@ -94,31 +94,6 @@ When activated, this experimental feature provides the following:
   described using |CPS|_. Refer to the :command:`find_package` documentation
   for details.
 
-C++ ``import std`` support
-==========================
-
-In order to activate support for ``import std`` in C++23 and newer targets,
-set
-
-* variable ``CMAKE_EXPERIMENTAL_CXX_IMPORT_STD`` to
-* value ``d0edc3af-4c50-42ea-a356-e2862fe7a444``.
-
-This UUID may change in future versions of CMake.  Be sure to use the value
-documented here by the source tree of the version of CMake with which you are
-experimenting.  It must be set before the ``CXX`` toolchain is discovered by
-CMake, usually as part of a :command:`project` call.
-
-When activated, this experimental feature provides the following:
-
-* The :prop_tgt:`CXX_MODULE_STD` target property and its initializing variable
-  :variable:`CMAKE_CXX_MODULE_STD`.
-
-* Targets with the property set to a true value and at least ``cxx_std_23``
-  may use ``import std;`` in any scanned C++ source file.
-
-.. _CPS: https://cps-org.github.io/cps/
-.. |CPS| replace:: Common Package Specification
-
 Build database support
 ======================
 

Help/manual/cmake-cxxmodules.7.rst

@@ -75,6 +75,8 @@ modules includes:
 ``import std`` Support
 ======================
 
+.. versionadded:: 4.3
+
 Support for ``import std`` is limited to the following toolchain and standard
 library combinations:
 
@@ -86,12 +88,6 @@ library combinations:
 The :variable:`CMAKE_CXX_COMPILER_IMPORT_STD` variable lists standard levels
 which have support for ``import std`` in the active C++ toolchain.
 
-.. note::
-
-   This support is provided only when experimental support for
-   ``import std`` has been enabled by the
-   ``CMAKE_EXPERIMENTAL_CXX_IMPORT_STD`` gate.
-
 Generator Support
 =================
 

Help/prop_tgt/CXX_MODULE_STD.rst

@@ -1,16 +1,11 @@
 CXX_MODULE_STD
 --------------
 
-.. versionadded:: 3.30
+.. versionadded:: 4.3
 
 ``CXX_MODULE_STD`` is a boolean specifying whether the target may use
 ``import std;`` its C++ sources or not.
 
-.. note::
-
-   This setting is meaningful only when experimental support for ``import
-   std;`` has been enabled by the ``CMAKE_EXPERIMENTAL_CXX_IMPORT_STD`` gate.
-
 When this property is explicitly set to ``ON``, CMake will add a dependency to
 a target which provides the C++ standard library's modules for the C++
 standard applied to the target. This target is only applicable within the

Help/release/dev/import-std.rst

@@ -0,0 +1,15 @@
+import-std
+----------
+* The experimental gate for C++23's ``import std`` has been dropped.
+
+* Variable :variable:`CMAKE_CXX_MODULE_STD` and property target
+  :prop_tgt:`CXX_MODULE_STD` control the availability of ``import std`` for
+  C++ targets.
+
+* Read-only variable :variable:`CMAKE_CXX_COMPILER_IMPORT_STD` lists the C++
+  standard levels for which ``import std`` is available on the current
+  toolchain.
+
+* Variable :variable:`CMAKE_CXX_STDLIB_MODULES_JSON` sets a specific module
+  metadata file which CMake will use for constructing ``import std`` instead
+  of relying on automatic detection via the current C++ compiler.

Help/variable/CMAKE_CXX_COMPILER_IMPORT_STD.rst

@@ -1,14 +1,9 @@
 CMAKE_CXX_COMPILER_IMPORT_STD
 -----------------------------
 
-.. versionadded:: 3.30
+.. versionadded:: 4.3
 
 A list of C++ standard levels for which ``import std`` support exists for the
 current C++ toolchain.  Support for C++\<NN\> may be detected using a
 ``<NN> IN_LIST CMAKE_CXX_COMPILER_IMPORT_STD`` predicate with the
 :command:`if` command.
-
-.. note::
-
-   This variable is meaningful only when experimental support for ``import
-   std;`` has been enabled by the ``CMAKE_EXPERIMENTAL_CXX_IMPORT_STD`` gate.

Help/variable/CMAKE_CXX_MODULE_STD.rst

@@ -1,15 +1,10 @@
 CMAKE_CXX_MODULE_STD
 --------------------
 
-.. versionadded:: 3.30
+.. versionadded:: 4.3
 
 Whether to add utility targets as dependencies to targets with at least
 ``cxx_std_23`` or not.
 
-.. note::
-
-   This setting is meaningful only when experimental support for ``import
-   std;`` has been enabled by the ``CMAKE_EXPERIMENTAL_CXX_IMPORT_STD`` gate.
-
 This variable is used to initialize the :prop_tgt:`CXX_MODULE_STD` property on
 all targets.  See that target property for additional information.

Help/variable/CMAKE_CXX_STDLIB_MODULES_JSON.rst

@@ -1,7 +1,7 @@
 CMAKE_CXX_STDLIB_MODULES_JSON
 -----------------------------
 
-.. versionadded:: 4.2
+.. versionadded:: 4.3
 
 This variable may be used to set the path to a metadata file for CMake to
 understand how the ``import std`` target for the active CXX compiler should be

Modules/Compiler/CMakeCommonCompilerMacros.cmake

@@ -220,17 +220,6 @@ function(cmake_cxx_find_modules_json)
     return ()
   endif ()
 
-  # Check the experimental flag. Check it here to avoid triggering warnings in
-  # situations that don't support the feature anyways.
-  set(_cmake_supported_import_std_experimental "")
-  cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-    "CxxImportStd"
-    _cmake_supported_import_std_experimental)
-  if (NOT _cmake_supported_import_std_experimental)
-    set(CMAKE_CXX_COMPILER_IMPORT_STD_ERROR_MESSAGE "Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled (usually a `project()` call)" PARENT_SCOPE)
-    return ()
-  endif ()
-
   _cmake_cxx_find_modules_json()
   set(CMAKE_CXX_COMPILER_IMPORT_STD_ERROR_MESSAGE "${CMAKE_CXX_COMPILER_IMPORT_STD_ERROR_MESSAGE}" PARENT_SCOPE)
   set(CMAKE_CXX_STDLIB_MODULES_JSON "${CMAKE_CXX_STDLIB_MODULES_JSON}" PARENT_SCOPE)

Source/cmExperimental.cxx

@@ -29,14 +29,6 @@ cmExperimental::FeatureData const LookupTable[] = {
     "only for experimentation and feedback to CMake developers.",
     {},
     cmExperimental::TryCompileCondition::Always },
-  // CxxImportStd
-  { "CxxImportStd",
-    "d0edc3af-4c50-42ea-a356-e2862fe7a444",
-    "CMAKE_EXPERIMENTAL_CXX_IMPORT_STD",
-    "CMake's support for `import std;` in C++23 and newer is experimental. It "
-    "is meant only for experimentation and feedback to CMake developers.",
-    {},
-    cmExperimental::TryCompileCondition::Always },
   // ImportPackageInfo
   { "ImportPackageInfo",
     "e82e467b-f997-4464-8ace-b00808fff261",

Source/cmExperimental.h

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

Source/cmGeneratorTarget.cxx

@@ -5305,18 +5305,6 @@ bool cmGeneratorTarget::ApplyCXXStdTargets()
                ">:", cxxTargetName, ">>"));
   }
 
-  // Check the experimental feature here. A toolchain may have
-  // skipped the check in the toolchain preparation logic.
-  if (!cmExperimental::HasSupportEnabled(
-        *this->Makefile, cmExperimental::Feature::CxxImportStd)) {
-    this->Makefile->IssueMessage(
-      MessageType::FATAL_ERROR,
-      "Experimental `import std` support not enabled when detecting "
-      "toolchain; it must be set before `CXX` is enabled (usually a "
-      "`project()` call).");
-    return false;
-  }
-
   return true;
 }
 

Tests/RunCMake/CXXModules/NoCXX23TargetRequired-stderr.txt

@@ -2,7 +2,7 @@ CMake Error in CMakeLists\.txt:
   The "CXX_MODULE_STD" property on target "nocxx23target" requires toolchain
   support, but it was not provided.  Reason:
 
-    (Toolchain does not support discovering module metadata|Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled \(usually a `project\(\)` call\)|Unsupported generator: [^\n]*)
+    (Toolchain does not support discovering module metadata|Unsupported generator: [^\n]*|Only `libc\+\+` and `libstdc\+\+` are supported)
 
 
 CMake Generate step failed\.  Build files cannot be regenerated correctly\.

Tests/RunCMake/CXXModules/NoCXX26TargetRequired-stderr.txt

@@ -2,7 +2,7 @@ CMake Error in CMakeLists\.txt:
   The "CXX_MODULE_STD" property on target "nocxx26target" requires toolchain
   support, but it was not provided.  Reason:
 
-    (Toolchain does not support discovering module metadata|Experimental `import std` support not enabled when detecting toolchain; it must be set before `CXX` is enabled \(usually a `project\(\)` call\)|Unsupported generator: [^\n]*)
+    (Toolchain does not support discovering module metadata|Unsupported generator: [^\n]*|Only `libc\+\+` and `libstdc\+\+` are supported)
 
 
 CMake Generate step failed\.  Build files cannot be regenerated correctly\.

Tests/RunCMake/CXXModulesCompile/imp-std-exp-no-std-build-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-exp-no-std-build/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 project(cxx_modules_import_std_export_no_std CXX)
 

Tests/RunCMake/CXXModulesCompile/imp-std-exp-no-std-install-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-exp-no-std-install/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 project(cxx_modules_import_std_export_no_std CXX)
 

Tests/RunCMake/CXXModulesCompile/imp-std-no-std-prop-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-no-std-prop/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 project(cxx_modules_import_std_no_std_property CXX)
 

Tests/RunCMake/CXXModulesCompile/imp-std-not-in-exp-build-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-not-in-exp-build/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 project(cxx_modules_import_std_not_in_export CXX)
 

Tests/RunCMake/CXXModulesCompile/imp-std-not-in-exp-install-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-not-in-exp-install/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 project(cxx_modules_import_std_not_in_export CXX)
 

Tests/RunCMake/CXXModulesCompile/imp-std-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-trans-exp-no-std-build-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-trans-exp-no-std-install-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-trans-not-in-exp-build-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-trans-not-in-exp-install-stderr.txt

@@ -1,8 +0,0 @@
-CMake Warning \(dev\) at .*/Modules/Compiler/CMakeCommonCompilerMacros\.cmake:[0-9]* \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer is experimental\.  It
-  is meant only for experimentation and feedback to CMake developers\.
-Call Stack \(most recent call first\):
-  .*/Modules/CMakeDetermineCompilerSupport\.cmake:[0-9]* \(cmake_cxx_find_modules_json\)
-  .*/Modules/CMakeTestCXXCompiler\.cmake:[0-9]* \(CMAKE_DETERMINE_COMPILER_SUPPORT\)
-  CMakeLists\.txt:[0-9]* \(project\)
-This warning is for project developers\.  Use -Wno-dev to suppress it\.

Tests/RunCMake/CXXModulesCompile/imp-std-trans/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 
 if (EXPORT_NO_STD)

Tests/RunCMake/CXXModulesCompile/imp-std/CMakeLists.txt

@@ -1,6 +1,3 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
 cmake_minimum_required(VERSION 3.29)
 project(cxx_modules_import_std CXX)
 

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

@@ -1,6 +0,0 @@
-^CMake Warning \(dev\) at Experimental/CxxImportStd-set\.cmake:4 \(cmake_language\):
-  CMake's support for `import std;` in C\+\+23 and newer 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/CxxImportStd-set.cmake

@@ -1,11 +0,0 @@
-set(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD
-  "d0edc3af-4c50-42ea-a356-e2862fe7a444")
-
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED
-  "CxxImportStd"
-  feature_present)
-
-if (NOT feature_present STREQUAL "TRUE")
-  message(FATAL_ERROR
-    "Expected the `CxxImportStd` feature to be enabled.")
-endif ()

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

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

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

@@ -1,25 +0,0 @@
-^CMake Warning \(dev\) at Experimental/CxxImportStd-wrong\.cmake:4 \(cmake_language\):
-  CMAKE_EXPERIMENTAL_CXX_IMPORT_STD 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/CxxImportStd-wrong\.cmake:19 \(cmake_language\):
-  CMAKE_EXPERIMENTAL_CXX_IMPORT_STD 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/CxxImportStd-wrong.cmake

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

Tests/RunCMake/cmake_language/RunCMakeTest.cmake

@@ -157,9 +157,6 @@ run_cmake_command(
     -P ${RunCMake_SOURCE_DIR}/get_message_log_level.cmake
   )
 
-run_cmake(Experimental/CxxImportStd-set)
-run_cmake(Experimental/CxxImportStd-unset)
-run_cmake(Experimental/CxxImportStd-wrong)
 run_cmake(Experimental/ExportPackageDependencies-set)
 run_cmake(Experimental/ExportPackageDependencies-unset)
 run_cmake(Experimental/ExportPackageDependencies-wrong)

Tests/RunCMake/property_init/CompileSources.cmake

@@ -156,6 +156,7 @@ set(properties
   "AUTOMOC_DEPEND_FILTERS"                  "FIRST<SEMI>SECOND" "<SAME>"
   ## C++
   "CXX_SCAN_FOR_MODULES"                    "ON"                "<SAME>"
+  "CXX_MODULE_STD"                          "ON"                "<SAME>"
   ## Ninja
   "JOB_POOL_COMPILE"                        "compile_pool"      "<SAME>"
   "JOB_POOL_LINK"                           "link_pool"         "<SAME>"
@@ -230,15 +231,6 @@ macro (add_language_properties lang std)
     )
 endmacro ()
 
-set(_cmake_supported_import_std_experimental "")
-cmake_language(GET_EXPERIMENTAL_FEATURE_ENABLED "CxxImportStd" _cmake_supported_import_std_experimental)
-if(_cmake_supported_import_std_experimental)
-  list(APPEND properties
-    # property                      expected  alias
-    "CXX_MODULE_STD"                "ON"      "<SAME>"
-  )
-endif()
-
 # Mock up knowing the standard flag. This doesn't actually build, so nothing
 # should care at this point.
 set(CMAKE_Cc_std_11_STANDARD_COMPILE_OPTION "-std=c11")

Tests/RunCMake/try_compile/Inspect-config.txt

@@ -69,5 +69,9 @@ events:(
       - "[^"]+")+
     message: \|(
 +      [^
-]*)*)*
+]*)*|
++  -
+    kind: "find-v1"(
+    [^
+]*)+)*
 \.\.\.$