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
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1 files changed, 41 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/abi/mangle34.C b/gcc/testsuite/g++.dg/abi/mangle34.C
new file mode 100644
index 000000000..08c3bc0a1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/abi/mangle34.C
@@ -0,0 +1,41 @@
+// Contributed by Dodji Seketeli <dodji@redhat.com>
+// Origin PR c++/40808
+// { dg-do compile }
+// This tests the mangling of empty template argument list in a template
+// id.
+// { dg-final { scan-assembler "_ZNK5DummyclI3GenEENT_3SigIE10ResultTypeERKS2_" } }
+
+
+struct Void {};
+
+template <class R> struct FunType {
+  typedef R ResultType;
+};
+
+struct WrongNumberOfSigArgs {};
+
+template <typename R> struct CFunType {
+  template <class Dummy1=Void, class Dummy2=Void> struct Sig : public
+FunType<WrongNumberOfSigArgs> {};
+  template <class Dummy> struct Sig<Void,Dummy> : public FunType<R> {};
+};
+
+struct Dummy {
+  template <typename F> typename F::template Sig<>::ResultType operator()(F
+const& f) const {
+    return typename F::template Sig<>::ResultType(0);
+  }
+};
+
+struct Gen: public CFunType<int> {
+  int operator()() const {return 0;}
+  Gen() {}
+};
+
+int myfunction() {
+  return Dummy()(Gen());
+}
+
+int main() {
+  myfunction();
+}