obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 45 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/template/sfinae20.C b/gcc/testsuite/g++.dg/template/sfinae20.C
new file mode 100644
index 000000000..9767bc029
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/sfinae20.C
@@ -0,0 +1,45 @@
+// PR c++/44907
+// { dg-options "-std=c++0x" }
+
+#include <utility>
+
+struct A { };
+
+struct B
+: public A { };
+
+struct C
+: public A { };
+
+struct D
+: public B, public C { };
+
+template<typename From, typename To>
+  class mini_is_convertible
+  {
+    typedef char one;
+    typedef struct { char arr[2]; } two;
+
+    template<typename To1>
+      static void test_aux(To1);
+
+    template<typename To1, typename From1>
+      static decltype(test_aux<To1>(std::declval<From1>()), one())
+      test(int);
+
+    template<typename, typename>
+      static two test(...);
+
+    public:
+      static const bool value = sizeof(test<To, From>(0)) == 1;
+  }; 
+
+template<typename From, typename To>
+  const bool mini_is_convertible<From, To>::value;
+
+static_assert (!mini_is_convertible<D*, A*>::value, "");
+static_assert (!mini_is_convertible<A*, D*>::value, "");
+static_assert (!mini_is_convertible<D&, A&>::value, "");
+static_assert (!mini_is_convertible<A&, D&>::value, "");
+static_assert (!mini_is_convertible<D, A>::value, "");
+static_assert (!mini_is_convertible<A, D>::value, "");