Features: Make CMAKE_CXX_KNOWN_FEATURES a property.

As a 'built-in' variable it imposes a cost on all variable lookups
and it is expected to be rarely used.

1 files changed, 48 insertions, 0 deletions

diff --git a/Source/cmake.h b/Source/cmake.h
index 76a3179..33b4f74 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -458,4 +458,52 @@ private:
   {"-Wno-dev", "Suppress developer warnings."},\
   {"-Wdev", "Enable developer warnings."}
 
+#define FOR_EACH_CXX_FEATURE(F) \
+  F(cxx_alias_templates) \
+  F(cxx_alignas) \
+  F(cxx_alignof) \
+  F(cxx_attributes) \
+  F(cxx_auto_type) \
+  F(cxx_constexpr) \
+  F(cxx_decltype) \
+  F(cxx_decltype_incomplete_return_types) \
+  F(cxx_default_function_template_args) \
+  F(cxx_defaulted_functions) \
+  F(cxx_defaulted_move_initializers) \
+  F(cxx_delegating_constructors) \
+  F(cxx_deleted_functions) \
+  F(cxx_enum_forward_declarations) \
+  F(cxx_explicit_conversions) \
+  F(cxx_extended_friend_declarations) \
+  F(cxx_extern_templates) \
+  F(cxx_final) \
+  F(cxx_func_identifier) \
+  F(cxx_generalized_initializers) \
+  F(cxx_inheriting_constructors) \
+  F(cxx_inline_namespaces) \
+  F(cxx_lambdas) \
+  F(cxx_local_type_template_args) \
+  F(cxx_long_long_type) \
+  F(cxx_noexcept) \
+  F(cxx_nonstatic_member_init) \
+  F(cxx_nullptr) \
+  F(cxx_override) \
+  F(cxx_range_for) \
+  F(cxx_raw_string_literals) \
+  F(cxx_reference_qualified_functions) \
+  F(cxx_right_angle_brackets) \
+  F(cxx_rvalue_references) \
+  F(cxx_sizeof_member) \
+  F(cxx_static_assert) \
+  F(cxx_strong_enums) \
+  F(cxx_template_template_parameters) \
+  F(cxx_thread_local) \
+  F(cxx_trailing_return_types) \
+  F(cxx_unicode_literals) \
+  F(cxx_uniform_initialization) \
+  F(cxx_unrestricted_unions) \
+  F(cxx_user_literals) \
+  F(cxx_variadic_macros) \
+  F(cxx_variadic_templates)
+
 #endif