Features: Record for MSVC 2010-2015

Also, in WCDH add MSVC Compatibility for cxx_align{of,as}.

Co-Author: Stephen Kelly <steveire@gmail.com>
Co-Author: Brad King <brad.king@kitware.com>

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()

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)
@@ -220,6 +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}