From 750dfee29c3f45020e8fcff91499a2542913b649 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Mon, 7 Apr 2014 17:28:55 +0200
Subject: Features: Add cxx_delegating_constructors.

---
 Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst            |  5 +++++
 Modules/Compiler/GNU-CXX-FeatureTests.cmake           |  3 +++
 Source/cmMakefile.cxx                                 |  3 ++-
 Tests/CompileFeatures/cxx_delegating_constructors.cpp | 15 +++++++++++++++
 4 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 Tests/CompileFeatures/cxx_delegating_constructors.cpp

diff --git a/Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst b/Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst
index 3278b2e..957c763 100644
--- a/Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst
+++ b/Help/variable/CMAKE_CXX_KNOWN_FEATURES.rst
@@ -16,3 +16,8 @@ The features known to this version of CMake are:
   Automatic type deduction, as defined in N1984_.
 
   .. _N1984: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf
+
+``cxx_delegating_constructors``
+  Delegating constructors, as defined in N1986_.
+
+  .. _N1986: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf
diff --git a/Modules/Compiler/GNU-CXX-FeatureTests.cmake b/Modules/Compiler/GNU-CXX-FeatureTests.cmake
index b36315f..4f14b17 100644
--- a/Modules/Compiler/GNU-CXX-FeatureTests.cmake
+++ b/Modules/Compiler/GNU-CXX-FeatureTests.cmake
@@ -2,6 +2,9 @@
 # Reference: http://gcc.gnu.org/projects/cxx0x.html
 
 set(_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 408")
+# TODO: Should be supported by GNU 4.7
+set(GNU47_CXX11 "${_oldestSupported} && __cplusplus >= 201103L")
+set(_cmake_feature_test_cxx_delegating_constructors "${GNU47_CXX11}")
 # TODO: Should be supported by GNU 4.4
 set(GNU44_CXX11 "${_oldestSupported} && __cplusplus >= 201103L")
 set(_cmake_feature_test_cxx_auto_type "${GNU44_CXX11}")
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 5004a08..de6b972 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -42,7 +42,8 @@
 #include <assert.h>
 
 #define FOR_EACH_CXX_FEATURE(F) \
-  F(cxx_auto_type)
+  F(cxx_auto_type) \
+  F(cxx_delegating_constructors)
 
 class cmMakefile::Internals
 {
diff --git a/Tests/CompileFeatures/cxx_delegating_constructors.cpp b/Tests/CompileFeatures/cxx_delegating_constructors.cpp
new file mode 100644
index 0000000..4b41615
--- /dev/null
+++ b/Tests/CompileFeatures/cxx_delegating_constructors.cpp
@@ -0,0 +1,15 @@
+
+class Foo
+{
+public:
+  Foo(int i);
+
+  Foo(double d)
+    : Foo(static_cast<int>(d))
+  {
+
+  }
+
+private:
+  int m_i;
+};
-- 
cgit v0.12