Merge topic 'feature-record-msvc'

d3489bdb Features: Record for MSVC 2010-2015
3228fc50 Features: Define meaning for no language standard default

Help/manual/cmake-developer.7.rst

@@ -80,7 +80,9 @@ When adding the first supported feature to a particular CompilerId, it is
 necessary to list support for all features known to cmake (See
 :variable:`CMAKE_C_COMPILE_FEATURES` and
 :variable:`CMAKE_CXX_COMPILE_FEATURES` as appropriate), where available for
-the compiler.
+the compiler.  Furthermore, set ``CMAKE_<LANG>_STANDARD_DEFAULT`` to the
+default language standard level the compiler uses, or to the empty string
+if the compiler has no notion of standard levels (such as ``MSVC``).
 
 It is sensible to record the features for the most recent version of a
 particular CompilerId first, and then work backwards.  It is sensible to

Help/prop_tgt/CXX_STANDARD.rst

@@ -5,7 +5,8 @@ The C++ standard whose features are requested to build this target.
 
 This property specifies the C++ standard whose features are requested
 to build this target.  For some compilers, this results in adding a
-flag such as ``-std=gnu++11`` to the compile line.
+flag such as ``-std=gnu++11`` to the compile line.  For compilers that
+have no notion of a standard level, such as MSVC, this has no effect.
 
 Supported values are ``98``, ``11`` and ``14``.
 

Help/prop_tgt/CXX_STANDARD_REQUIRED.rst

@@ -7,7 +7,8 @@ If this property is set to ``ON``, then the value of the
 :prop_tgt:`CXX_STANDARD` target property is treated as a requirement.  If this
 property is ``OFF`` or unset, the :prop_tgt:`CXX_STANDARD` target property is
 treated as optional and may "decay" to a previous standard if the requested is
-not available.
+not available.  For compilers that have no notion of a standard level, such as
+MSVC, this has no effect.
 
 See the :manual:`cmake-compile-features(7)` manual for information on
 compile features.

Help/prop_tgt/C_STANDARD.rst

@@ -5,7 +5,8 @@ The C standard whose features are requested to build this target.
 
 This property specifies the C standard whose features are requested
 to build this target.  For some compilers, this results in adding a
-flag such as ``-std=gnu11`` to the compile line.
+flag such as ``-std=gnu11`` to the compile line.  For compilers that
+have no notion of a standard level, such as MSVC, this has no effect.
 
 Supported values are ``90``, ``99`` and ``11``.
 

Help/prop_tgt/C_STANDARD_REQUIRED.rst

@@ -7,7 +7,8 @@ If this property is set to ``ON``, then the value of the
 :prop_tgt:`C_STANDARD` target property is treated as a requirement.  If this
 property is ``OFF`` or unset, the :prop_tgt:`C_STANDARD` target property is
 treated as optional and may "decay" to a previous standard if the requested is
-not available.
+not available.  For compilers that have no notion of a standard level, such as
+MSVC, this has no effect.
 
 See the :manual:`cmake-compile-features(7)` manual for information on
 compile features.

Help/release/dev/feature-record-msvc.rst

@@ -0,0 +1,5 @@
+feature-record-msvc
+-------------------
+
+* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
+  is now aware of features supported by Microsoft Visual Studio (``MSVC``).

Modules/Compiler/MSVC-CXX-FeatureTests.cmake

@@ -0,0 +1,106 @@
+
+# Reference: http://msdn.microsoft.com/en-us/library/vstudio/hh567368.aspx
+# http://blogs.msdn.com/b/vcblog/archive/2013/06/28/c-11-14-stl-features-fixes-and-breaking-changes-in-vs-2013.aspx
+# http://blogs.msdn.com/b/vcblog/archive/2014/11/17/c-11-14-17-features-in-vs-2015-preview.aspx
+# http://www.visualstudio.com/en-us/news/vs2015-preview-vs.aspx
+
+
+set(_cmake_oldestSupported "_MSC_VER >= 1600")
+
+set(MSVC_2015 "_MSC_VER >= 1900")
+set(_cmake_feature_test_cxx_alignas "${MSVC_2015}")
+set(_cmake_feature_test_cxx_alignof "${MSVC_2015}")
+set(_cmake_feature_test_cxx_binary_literals "${MSVC_2015}")
+set(_cmake_feature_test_cxx_decltype_auto "${MSVC_2015}")
+# Digit separators are not available as of VS 2015 Preview, but a footnote
+# says they will be available in the RTM.
+set(_cmake_feature_test_cxx_digit_separators "${MSVC_2015}")
+set(_cmake_feature_test_cxx_func_identifier "${MSVC_2015}")
+# http://blogs.msdn.com/b/vcblog/archive/2014/11/17/c-11-14-17-features-in-vs-2015-preview.aspx
+# Note 1. While previous version of VisualStudio said they supported these
+# they silently produced bad code, and are now marked as having partial
+# support in previous versions. The footnote says the support will be complete
+# in MSVC 2015, so support the feature for that version, assuming that is true.
+set(_cmake_feature_test_cxx_generalized_initializers "${MSVC_2015}")
+set(_cmake_feature_test_cxx_nonstatic_member_init "${MSVC_2015}")
+# Microsoft calls this 'rvalue references v3'
+set(_cmake_feature_test_cxx_defaulted_move_initializers "${MSVC_2015}")
+set(_cmake_feature_test_cxx_generic_lambdas "${MSVC_2015}")
+set(_cmake_feature_test_cxx_inheriting_constructors "${MSVC_2015}")
+set(_cmake_feature_test_cxx_inline_namespaces "${MSVC_2015}")
+set(_cmake_feature_test_cxx_lambda_init_captures "${MSVC_2015}")
+set(_cmake_feature_test_cxx_noexcept "${MSVC_2015}")
+set(_cmake_feature_test_cxx_return_type_deduction "${MSVC_2015}")
+set(_cmake_feature_test_cxx_sizeof_member "${MSVC_2015}")
+set(_cmake_feature_test_cxx_thread_local "${MSVC_2015}")
+set(_cmake_feature_test_cxx_unicode_literals "${MSVC_2015}")
+set(_cmake_feature_test_cxx_unrestricted_unions "${MSVC_2015}")
+set(_cmake_feature_test_cxx_user_literals "${MSVC_2015}")
+set(_cmake_feature_test_cxx_reference_qualified_functions "${MSVC_2015}")
+# "The copies and moves don't interact precisely like the Standard says they
+# should. For example, deletion of moves is specified to also suppress
+# copies, but Visual C++ in Visual Studio 2013 does not."
+# http://blogs.msdn.com/b/vcblog/archive/2014/11/17/c-11-14-17-features-in-vs-2015-preview.aspx
+# lists this as 'partial' in 2013
+set(_cmake_feature_test_cxx_deleted_functions "${MSVC_2015}")
+
+set(MSVC_2013 "_MSC_VER >= 1800")
+set(_cmake_feature_test_cxx_alias_templates "${MSVC_2013}")
+# Microsoft now states they support contextual conversions in 2013 and above.
+# See footnote 6 at:
+# http://blogs.msdn.com/b/vcblog/archive/2014/11/17/c-11-14-17-features-in-vs-2015-preview.aspx
+set(_cmake_feature_test_cxx_contextual_conversions "${MSVC_2013}")
+set(_cmake_feature_test_cxx_default_function_template_args "${MSVC_2013}")
+set(_cmake_feature_test_cxx_defaulted_functions "${MSVC_2013}")
+set(_cmake_feature_test_cxx_delegating_constructors "${MSVC_2013}")
+set(_cmake_feature_test_cxx_explicit_conversions "${MSVC_2013}")
+set(_cmake_feature_test_cxx_raw_string_literals "${MSVC_2013}")
+set(_cmake_feature_test_cxx_uniform_initialization "${MSVC_2013}")
+# Support is documented, but possibly partly broken:
+# https://msdn.microsoft.com/en-us/library/hh567368.aspx
+# http://thread.gmane.org/gmane.comp.lib.boost.devel/244986/focus=245333
+set(_cmake_feature_test_cxx_variadic_templates "${MSVC_2013}")
+
+set(MSVC_2012 "_MSC_VER >= 1700")
+set(_cmake_feature_test_cxx_enum_forward_declarations "${MSVC_2012}")
+set(_cmake_feature_test_cxx_final "${MSVC_2012}")
+set(_cmake_feature_test_cxx_range_for "${MSVC_2012}")
+set(_cmake_feature_test_cxx_strong_enums "${MSVC_2012}")
+
+set(MSVC_2010 "_MSC_VER >= 1600")
+set(_cmake_feature_test_cxx_auto_type "${MSVC_2010}")
+set(_cmake_feature_test_cxx_decltype "${MSVC_2010}")
+set(_cmake_feature_test_cxx_extended_friend_declarations "${MSVC_2010}")
+set(_cmake_feature_test_cxx_extern_templates "${MSVC_2010}")
+set(_cmake_feature_test_cxx_lambdas "${MSVC_2010}")
+set(_cmake_feature_test_cxx_local_type_template_args "${MSVC_2010}")
+set(_cmake_feature_test_cxx_long_long_type "${MSVC_2010}")
+set(_cmake_feature_test_cxx_nullptr "${MSVC_2010}")
+set(_cmake_feature_test_cxx_override "${MSVC_2010}")
+set(_cmake_feature_test_cxx_right_angle_brackets "${MSVC_2010}")
+set(_cmake_feature_test_cxx_rvalue_references "${MSVC_2010}")
+set(_cmake_feature_test_cxx_static_assert "${MSVC_2010}")
+set(_cmake_feature_test_cxx_template_template_parameters "${MSVC_2010}")
+set(_cmake_feature_test_cxx_trailing_return_types "${MSVC_2010}")
+set(_cmake_feature_test_cxx_variadic_macros "${MSVC_2010}")
+
+# Currently unsupported:
+# set(_cmake_feature_test_cxx_constexpr )
+# set(_cmake_feature_test_cxx_relaxed_constexpr )
+# set(_cmake_feature_test_cxx_attributes )
+# set(_cmake_feature_test_cxx_attribute_deprecated )
+# 'NSDMIs for aggregates'
+# set(_cmake_feature_test_cxx_aggregate_default_initializers )
+# set(_cmake_feature_test_cxx_variable_templates )
+
+# In theory decltype incomplete return types was added in 2012
+# but without support for decltype_auto and return type deduction this
+# feature is unusable.  This remains so as of VS 2015 Preview.
+# set(_cmake_feature_test_cxx_decltype_incomplete_return_types )
+
+# Unset all the variables that we don't need exposed.
+# _cmake_oldestSupported is required by WriteCompilerDetectionHeader
+set(MSVC_2015)
+set(MSVC_2013)
+set(MSVC_2012)
+set(MSVC_2010)

Modules/Compiler/MSVC-CXX.cmake

@@ -0,0 +1,6 @@
+# MSVC has no specific language level or flags to change it.
+set(CMAKE_CXX_STANDARD_DEFAULT "")
+
+macro(cmake_record_cxx_compile_features)
+  record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES)
+endmacro()

Modules/WriteCompilerDetectionHeader.cmake

@@ -36,7 +36,7 @@
 #      PREFIX ClimbingStats
 #      OUTPUT_FILES_VAR support_files
 #      OUTPUT_DIR compilers
-#      COMPILERS GNU Clang
+#      COMPILERS GNU Clang MSVC
 #      FEATURES cxx_variadic_templates
 #    )
 #    install(FILES
@@ -100,7 +100,7 @@
 #    write_compiler_detection_header(
 #      FILE climbingstats_compiler_detection.h
 #      PREFIX ClimbingStats
-#      COMPILERS GNU Clang AppleClang
+#      COMPILERS GNU Clang AppleClang MSVC
 #      FEATURES cxx_variadic_templates
 #    )
 #
@@ -321,6 +321,7 @@ function(write_compiler_detection_header
     GNU
     Clang
     AppleClang
+    MSVC
     SunPro
   )
 
@@ -528,6 +529,8 @@ function(write_compiler_detection_header
 #    define ${def_value} alignas(X)
 #  elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
 #    define ${def_value} __attribute__ ((__aligned__(X)))
+#  elif ${prefix_arg}_COMPILER_IS_MSVC
+#    define ${def_value} __declspec(align(X))
 #  else
 #    define ${def_value}
 #  endif
@@ -540,6 +543,8 @@ function(write_compiler_detection_header
 #    define ${def_value} alignof(X)
 #  elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
 #    define ${def_value} __alignof__(X)
+#  elif ${prefix_arg}_COMPILER_IS_MSVC
+#    define ${def_value} __alignof(X)
 #  endif
 \n")
       endif()

Source/cmGeneratorExpressionEvaluator.cxx

@@ -1370,6 +1370,8 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
       {
       std::vector<std::string> const& langAvailable
                                               = availableFeatures[lit->first];
+      const char* standardDefault = context->Makefile
+        ->GetDefinition("CMAKE_" + lit->first + "_STANDARD_DEFAULT");
       for (std::vector<std::string>::const_iterator it = lit->second.begin();
           it != lit->second.end(); ++it)
         {
@@ -1378,6 +1380,12 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
           {
           return "0";
           }
+        if (standardDefault && !*standardDefault)
+          {
+          // This compiler has no notion of language standard levels.
+          // All features known for the language are always available.
+          continue;
+          }
         if (!context->Makefile->HaveStandardAvailable(target,
                                                       lit->first, *it))
           {
@@ -1386,8 +1394,7 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
             const char* l = target->GetProperty(lit->first + "_STANDARD");
             if (!l)
               {
-              l = context->Makefile
+              l = standardDefault;
-                  ->GetDefinition("CMAKE_" + lit->first + "_STANDARD_DEFAULT");
               }
             assert(l);
             context->MaxLanguageStandard[target][lit->first] = l;

Source/cmLocalGenerator.cxx

@@ -2207,6 +2207,13 @@ AddCompilerRequirementFlag(std::string &flags, cmTarget* target,
     {
     return;
     }
+  const char* defaultStd
+      = this->Makefile->GetDefinition("CMAKE_" + lang + "_STANDARD_DEFAULT");
+  if (defaultStd && !*defaultStd)
+    {
+    // This compiler has no notion of language standard levels.
+    return;
+    }
   std::string stdProp = lang + "_STANDARD";
   const char *standardProp = target->GetProperty(stdProp);
   if (!standardProp)
@@ -2269,8 +2276,6 @@ AddCompilerRequirementFlag(std::string &flags, cmTarget* target,
                                 std::find(stds.begin(), stds.end(), standard);
   assert(stdIt != stds.end());
 
-  const char* defaultStd
-      = this->Makefile->GetDefinition("CMAKE_" + lang + "_STANDARD_DEFAULT");
   std::vector<std::string>::const_iterator defaultStdIt;
   if (defaultStd)
     {

Source/cmMakefile.cxx

@@ -5253,6 +5253,27 @@ bool cmMakefile::
 HaveCStandardAvailable(cmTarget const* target,
                        const std::string& feature) const
 {
+  const char* defaultCStandard =
+    this->GetDefinition("CMAKE_C_STANDARD_DEFAULT");
+  if (!defaultCStandard)
+    {
+    std::ostringstream e;
+    e << "CMAKE_C_STANDARD_DEFAULT is not set.  COMPILE_FEATURES support "
+      "not fully configured for this compiler.";
+    this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+    // Return true so the caller does not try to lookup the default standard.
+    return true;
+    }
+  if (std::find_if(cmArrayBegin(C_STANDARDS), cmArrayEnd(C_STANDARDS),
+                cmStrCmp(defaultCStandard)) == cmArrayEnd(C_STANDARDS))
+    {
+    std::ostringstream e;
+    e << "The CMAKE_C_STANDARD_DEFAULT variable contains an "
+         "invalid value: \"" << defaultCStandard << "\".";
+    this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+    return false;
+    }
+
   bool needC90 = false;
   bool needC99 = false;
   bool needC11 = false;
@@ -5262,7 +5283,7 @@ HaveCStandardAvailable(cmTarget const* target,
   const char *existingCStandard = target->GetProperty("C_STANDARD");
   if (!existingCStandard)
     {
-    existingCStandard = this->GetDefinition("CMAKE_C_STANDARD_DEFAULT");
+    existingCStandard = defaultCStandard;
     }
 
   if (std::find_if(cmArrayBegin(C_STANDARDS), cmArrayEnd(C_STANDARDS),
@@ -5331,6 +5352,27 @@ bool cmMakefile::IsLaterStandard(std::string const& lang,
 bool cmMakefile::HaveCxxStandardAvailable(cmTarget const* target,
                                          const std::string& feature) const
 {
+  const char* defaultCxxStandard =
+    this->GetDefinition("CMAKE_CXX_STANDARD_DEFAULT");
+  if (!defaultCxxStandard)
+    {
+    std::ostringstream e;
+    e << "CMAKE_CXX_STANDARD_DEFAULT is not set.  COMPILE_FEATURES support "
+      "not fully configured for this compiler.";
+    this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+    // Return true so the caller does not try to lookup the default standard.
+    return true;
+    }
+  if (std::find_if(cmArrayBegin(CXX_STANDARDS), cmArrayEnd(CXX_STANDARDS),
+                cmStrCmp(defaultCxxStandard)) == cmArrayEnd(CXX_STANDARDS))
+    {
+    std::ostringstream e;
+    e << "The CMAKE_CXX_STANDARD_DEFAULT variable contains an "
+         "invalid value: \"" << defaultCxxStandard << "\".";
+    this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+    return false;
+    }
+
   bool needCxx98 = false;
   bool needCxx11 = false;
   bool needCxx14 = false;
@@ -5339,7 +5381,7 @@ bool cmMakefile::HaveCxxStandardAvailable(cmTarget const* target,
   const char *existingCxxStandard = target->GetProperty("CXX_STANDARD");
   if (!existingCxxStandard)
     {
-    existingCxxStandard = this->GetDefinition("CMAKE_CXX_STANDARD_DEFAULT");
+    existingCxxStandard = defaultCxxStandard;
     }
 
   if (std::find_if(cmArrayBegin(CXX_STANDARDS), cmArrayEnd(CXX_STANDARDS),

Tests/CompileFeatures/CMakeLists.txt

@@ -100,6 +100,31 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
   )
 endif()
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
+    list(REMOVE_ITEM CXX_non_features
+      # The cxx_contextual_conversions feature happens to work
+      # (for *this* testcase) with VS 2010 and VS 2012, but
+      # they do not document support until VS 2013.
+      cxx_contextual_conversions
+      )
+  elseif (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0)
+    list(REMOVE_ITEM CXX_non_features
+      # The cxx_deleted_functions and cxx_nonstatic_member_init
+      # features happen to work (for *this* testcase) with VS 2013,
+      # but they do not document support until VS 2015.
+      cxx_deleted_functions
+      cxx_nonstatic_member_init
+      )
+  else()
+    list(REMOVE_ITEM CXX_non_features
+      # The cxx_constexpr feature happens to work (for *this* testcase)
+      # with VS 2015, but they document only partial support.
+      cxx_constexpr
+      )
+  endif()
+endif()
+
 set(C_ext c)
 set(C_standard_flag 11)
 set(CXX_ext cpp)
@@ -128,6 +153,7 @@ foreach(lang CXX C)
 endforeach()
 
 if (CMAKE_C_COMPILE_FEATURES)
+  if (CMAKE_C_STANDARD_DEFAULT)
     string(FIND "${CMAKE_C_FLAGS}" "-std=" std_flag_idx)
     if (std_flag_idx EQUAL -1)
       add_executable(default_dialect_C default_dialect.c)
@@ -138,8 +164,10 @@ if (CMAKE_C_COMPILE_FEATURES)
       )
     endif()
   endif()
+endif()
 
 if (CMAKE_CXX_COMPILE_FEATURES)
+  if (CMAKE_CXX_STANDARD_DEFAULT)
     string(FIND "${CMAKE_CXX_FLAGS}" "-std=" std_flag_idx)
     if (std_flag_idx EQUAL -1)
       add_executable(default_dialect default_dialect.cpp)
@@ -149,6 +177,7 @@ if (CMAKE_CXX_COMPILE_FEATURES)
         DEFAULT_CXX98=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},98>
       )
     endif()
+  endif()
 
   add_executable(CompileFeatures main.cpp)
   set_property(TARGET CompileFeatures
@@ -216,6 +245,29 @@ if (CMAKE_CXX_COMPILE_FEATURES)
         -DEXPECT_INHERITING_CONSTRUCTORS_AND_FINAL=0
       )
     endif()
+  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0)
+      add_definitions(
+        -DEXPECT_OVERRIDE_CONTROL=1
+        -DEXPECT_INHERITING_CONSTRUCTORS=1
+        -DEXPECT_FINAL=1
+        -DEXPECT_INHERITING_CONSTRUCTORS_AND_FINAL=1
+      )
+    elseif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0)
+      add_definitions(
+        -DEXPECT_OVERRIDE_CONTROL=1
+        -DEXPECT_INHERITING_CONSTRUCTORS=0
+        -DEXPECT_FINAL=1
+        -DEXPECT_INHERITING_CONSTRUCTORS_AND_FINAL=0
+      )
+    else()
+      add_definitions(
+        -DEXPECT_OVERRIDE_CONTROL=0
+        -DEXPECT_INHERITING_CONSTRUCTORS=0
+        -DEXPECT_FINAL=0
+        -DEXPECT_INHERITING_CONSTRUCTORS_AND_FINAL=0
+      )
+    endif()
   elseif (CMAKE_CXX_COMPILER_ID STREQUAL "SunPro")
     add_definitions(
       -DEXPECT_OVERRIDE_CONTROL=1

Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt

@@ -11,7 +11,7 @@ get_property(c_known_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
 write_compiler_detection_header(
   FILE "${CMAKE_CURRENT_BINARY_DIR}/test_compiler_detection.h"
   PREFIX TEST
-  COMPILERS GNU Clang AppleClang SunPro
+  COMPILERS GNU Clang AppleClang MSVC SunPro
   VERSION 3.1
   PROLOG "// something"
   EPILOG "// more"
@@ -67,6 +67,17 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
   list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
 endif()
 
+# for msvc the compiler version determines which c++11 features are available.
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  if(";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_delegating_constructors;")
+    list(APPEND true_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
+    list(APPEND true_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
+  else()
+    list(APPEND false_defs EXPECTED_COMPILER_CXX_DELEGATING_CONSTRUCTORS)
+    list(APPEND false_defs EXPECTED_COMPILER_CXX_VARIADIC_TEMPLATES)
+  endif()
+endif()
+
 if (CMAKE_C_COMPILER_ID STREQUAL "GNU"
     OR CMAKE_C_COMPILER_ID STREQUAL "Clang"
     OR CMAKE_C_COMPILER_ID STREQUAL "AppleClang")
@@ -84,7 +95,7 @@ write_compiler_detection_header(
   PREFIX MULTI
   OUTPUT_FILES_VAR multi_files
   OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/compiler_multi_files/compiler_support"
-  COMPILERS GNU Clang AppleClang SunPro
+  COMPILERS GNU Clang AppleClang MSVC SunPro
   VERSION 3.1
   FEATURES
     ${cxx_known_features} ${c_known_features}

Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake

@@ -17,6 +17,8 @@ file(READ
   "${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx_features.txt"
   CXX_FEATURES
 )
+include("${RunCMake_BINARY_DIR}/generate_feature_list-build/c_standard_default.cmake")
+include("${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx_standard_default.cmake")
 
 if (NOT C_FEATURES)
   run_cmake(NoSupportedCFeatures)
@@ -27,7 +29,9 @@ if (NOT CXX_FEATURES)
   run_cmake(NoSupportedCxxFeatures)
   run_cmake(NoSupportedCxxFeaturesGenex)
 else()
+  if(CXX_STANDARD_DEFAULT)
     run_cmake(LinkImplementationFeatureCycle)
+  endif()
   run_cmake(LinkImplementationFeatureCycleSolved)
 
   if (";${CXX_FEATURES};" MATCHES ";cxx_final;")
@@ -38,6 +42,7 @@ else()
   unset(RunCMake_TEST_OPTIONS)
 endif()
 
+if(CXX_STANDARD_DEFAULT)
   foreach(standard 98 11)
     file(READ
       "${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx${standard}_flag.txt"
@@ -52,3 +57,4 @@ foreach(standard 98 11)
       run_cmake(RequireCXX${standard}ExtVariable)
     endif()
   endforeach()
+endif()

Tests/RunCMake/CompileFeatures/generate_feature_list.cmake

@@ -9,6 +9,20 @@ file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx_features.txt"
   "${CMAKE_CXX_COMPILE_FEATURES}"
 )
 
+if(DEFINED CMAKE_C_STANDARD_DEFAULT)
+  set(c_standard_default_code "set(C_STANDARD_DEFAULT \"${CMAKE_C_STANDARD_DEFAULT}\")\n")
+else()
+  set(c_standard_default_code "unset(C_STANDARD_DEFAULT)\n")
+endif()
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/c_standard_default.cmake" "${c_standard_default_code}")
+
+if(DEFINED CMAKE_CXX_STANDARD_DEFAULT)
+  set(cxx_standard_default_code "set(CXX_STANDARD_DEFAULT \"${CMAKE_CXX_STANDARD_DEFAULT}\")\n")
+else()
+  set(cxx_standard_default_code "unset(CXX_STANDARD_DEFAULT)\n")
+endif()
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx_standard_default.cmake" "${cxx_standard_default_code}")
+
 foreach(standard 98 11)
   set(CXX${standard}_FLAG NOTFOUND)
   if (DEFINED CMAKE_CXX${standard}_STANDARD_COMPILE_OPTION)