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, 112 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/torture/pr42450.C b/gcc/testsuite/g++.dg/torture/pr42450.C
new file mode 100644
index 000000000..f630fa2b7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr42450.C
@@ -0,0 +1,112 @@
+/* { dg-do compile } */
+
+template < typename > class basic_stringstream;
+
+struct basic_string {
+  basic_string();
+};
+
+struct ios_base {
+  virtual ~ios_base();
+};
+
+class ostream:ios_base {};
+class istream:virtual ios_base {};
+
+template < typename > struct basic_iostream:public istream, ostream {
+  ~basic_iostream () {}
+};
+extern template class basic_iostream < char >;
+
+template < typename > struct basic_stringstream:public basic_iostream < char > {
+    basic_string _M_stringbuf;
+    ~basic_stringstream () {}
+};
+extern template class basic_stringstream < char >;
+
+template < typename > struct AnyMatrixBase;
+template < typename, int _Rows, int _Cols, int = _Rows, int = _Cols > class Matrix;
+template < typename > class CwiseNullaryOp;
+
+template < typename Derived > struct MatrixBase:public AnyMatrixBase < Derived > {
+  typedef CwiseNullaryOp < Derived > ConstantReturnType;
+  ConstantReturnType Constant ();
+  template < typename > Derived cast ();
+  static CwiseNullaryOp < Derived > Random (int);
+};
+
+template < typename Derived > struct AnyMatrixBase {
+  Derived derived () {}
+  Derived & derived () const {}
+};
+
+template < typename, int > struct ei_matrix_storage {};
+
+template < typename _Scalar, int, int, int _MaxRows, int _MaxCols > struct Matrix:MatrixBase < Matrix < _Scalar, _MaxRows, _MaxCols > > {
+  typedef MatrixBase < Matrix > Base;
+  ei_matrix_storage < int, _MaxCols > m_storage;
+  Matrix operator= (const Matrix other) {
+    _resize_to_match (other);
+    lazyAssign (other.derived ());
+  }
+  template < typename OtherDerived > Matrix lazyAssign (MatrixBase < OtherDerived > other) {
+    _resize_to_match (other);
+    return Base (other.derived ());
+  }
+  Matrix ();
+  template < typename OtherDerived > Matrix (const MatrixBase < OtherDerived > &other) {
+    *this = other;
+  }
+  template < typename OtherDerived > void _resize_to_match (const MatrixBase < OtherDerived > &) {
+    throw 1;
+  }
+};
+
+template < typename MatrixType > class CwiseNullaryOp:
+public MatrixBase < CwiseNullaryOp < MatrixType > > {};
+
+int f()
+{
+  bool align_cols;
+  if (align_cols) {
+    basic_stringstream<char> sstr;
+    f();
+  }
+}
+
+template < typename > struct AutoDiffScalar;
+template < typename Functor > struct AutoDiffJacobian:Functor {
+  AutoDiffJacobian (Functor);
+  typedef typename Functor::InputType InputType;
+  typedef typename Functor::ValueType ValueType;
+  typedef Matrix < int, Functor::InputsAtCompileTime, 1 > DerivativeType;
+  typedef AutoDiffScalar < DerivativeType > ActiveScalar;
+  typedef Matrix < ActiveScalar, Functor::InputsAtCompileTime, 1 > ActiveInput;
+  void operator () (InputType x, ValueType *) {
+    ActiveInput ax = x.template cast < ActiveScalar > ();
+  }
+};
+
+template < int NX, int NY > struct TestFunc1 {
+  enum  {
+    InputsAtCompileTime = NX
+  };
+  typedef Matrix < float, NX, 1 > InputType;
+  typedef Matrix < float, NY, 1 > ValueType;
+  typedef Matrix < float, NY, NX > JacobianType;
+  int inputs ();
+};
+
+template < typename Func > void forward_jacobian (Func f) {
+  typename Func::InputType x = Func::InputType::Random (f.inputs ());
+  typename Func::ValueType y;
+  typename Func::JacobianType jref = jref.Constant ();
+  AutoDiffJacobian < Func > autoj (f);
+  autoj (x, &y);
+}
+
+void test_autodiff_scalar ()
+{
+  forward_jacobian (TestFunc1 < 2, 2 > ());
+  forward_jacobian (TestFunc1 < 3, 2 > ());
+}