Features: Add cxx_sizeof_member.

Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst

@@ -137,6 +137,11 @@ The features known to this version of CMake are:
 
   .. _N2118: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html
 
+``cxx_sizeof_member``
+  Size of non-static data members, as defined in N2253_.
+
+  .. _N2253: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html
+
 ``cxx_static_assert``
   Static assert, as defined in N1720_.
 

Modules/Compiler/GNU-CXX-FeatureTests.cmake

@@ -43,6 +43,7 @@ set(_cmake_feature_test_cxx_defaulted_functions "${GNU44_CXX11}")
 set(_cmake_feature_test_cxx_deleted_functions "${GNU44_CXX11}")
 set(_cmake_feature_test_cxx_generalized_initializers "${GNU44_CXX11}")
 set(_cmake_feature_test_cxx_inline_namespaces "${GNU44_CXX11}")
+set(_cmake_feature_test_cxx_sizeof_member "${GNU44_CXX11}")
 set(_cmake_feature_test_cxx_strong_enums "${GNU44_CXX11}")
 set(_cmake_feature_test_cxx_trailing_return_types "${GNU44_CXX11}")
 set(_cmake_feature_test_cxx_unicode_literals "${GNU44_CXX11}")

Source/cmMakefile.cxx

@@ -67,6 +67,7 @@
   F(cxx_raw_string_literals) \
   F(cxx_reference_qualified_functions) \
   F(cxx_rvalue_references) \
+  F(cxx_sizeof_member) \
   F(cxx_static_assert) \
   F(cxx_strong_enums) \
   F(cxx_thread_local) \

Tests/CompileFeatures/cxx_sizeof_member.cpp

@@ -0,0 +1,10 @@
+
+struct A
+{
+  int m_i;
+};
+
+int someFunc()
+{
+  return sizeof(A::m_i) > 0 ? 1 : 2;
+}