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, 33 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.old-deja/g++.jason/dcast3.C b/gcc/testsuite/g++.old-deja/g++.jason/dcast3.C
new file mode 100644
index 000000000..a6179187f
--- /dev/null
+++ b/gcc/testsuite/g++.old-deja/g++.jason/dcast3.C
@@ -0,0 +1,33 @@
+// { dg-do run  }
+// Testcase for tricky dynamic cast situations.
+
+struct A {
+  virtual void f () { }
+};
+
+struct B : public A { };
+struct C : public B { };
+struct D : public B { };
+struct E : public C, public D { };
+
+struct B2 : public virtual A { };
+struct C2 : public B2 { };
+struct D2 : public B2 { };
+struct E2 : public C2, public D2 { };
+
+int main ()
+{
+  E e;
+  E2 e2;
+
+  A* ap = (C*)&e;
+
+  // ap points to base subobject of unique B; succeeds
+  if (dynamic_cast <B*> (ap) == 0)
+    return 1;
+
+  ap = (C2*)&e2;
+  // ap points to base subobject shared by two Bs; fails
+  if (dynamic_cast <B2*> (ap) != 0)
+    return 2;
+}