Features: Add cxx_variadic_macros.

Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst

@@ -167,6 +167,11 @@ The features known to this version of CMake are:
 
   .. _N2765: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf
 
+``cxx_variadic_macros``
+  Variadic macros, as defined in N1653_.
+
+  .. _N1653: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm
+
 ``cxx_variadic_templates``
   Variadic templates, as defined in N2242_.
 

Modules/Compiler/GNU-CXX-FeatureTests.cmake

@@ -60,4 +60,6 @@ set(_cmake_feature_test_cxx_rvalue_references "${GNU43_CXX11}")
 set(_cmake_feature_test_cxx_static_assert "${GNU43_CXX11}")
 # TODO: Should be supported since GNU 3.4?
 set(_cmake_feature_test_cxx_extern_templates "${_oldestSupported} && __cplusplus >= 201103L")
+# TODO: Should be supported forever?
+set(_cmake_feature_test_cxx_variadic_macros "${_oldestSupported} && __cplusplus >= 201103L")
 set(_oldestSupported)

Source/cmMakefile.cxx

@@ -73,6 +73,7 @@
   F(cxx_uniform_initialization) \
   F(cxx_unrestricted_unions) \
   F(cxx_user_literals) \
+  F(cxx_variadic_macros) \
   F(cxx_variadic_templates)
 
 class cmMakefile::Internals

Tests/CompileFeatures/cxx_variadic_macros.cpp

@@ -0,0 +1,12 @@
+
+int someFunc(int, char, int)
+{
+  return 0;
+}
+
+#define FUNC_WRAPPER(...) someFunc(__VA_ARGS__)
+
+void otherFunc()
+{
+  FUNC_WRAPPER(42, 'a', 7);
+}