extend C++ tests to make sure we do not generate warnings (and fix some...

extend C++ tests to make sure we do not generate warnings (and fix some warnings that we did generate)

tests/run/cpp_bool.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from libcpp cimport bool
 

tests/run/cpp_classes.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from libcpp.vector cimport vector
 

tests/run/cpp_const_method.pyx

+# mode: run
+# tag: cpp, werror
 # cython: experimental_cpp_class_def=True
-# tag: cpp
 
 from libcpp.vector cimport vector
 

tests/run/cpp_custom_string.srctree

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 PYTHON setup.py build_ext --inplace
 PYTHON -c "import a; a.test_convert()"

tests/run/cpp_exceptions.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 cdef int raise_py_error() except *:
     raise TypeError("custom")

tests/run/cpp_exceptions_nogil.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 cdef int raise_TypeError() except *:
     raise TypeError("custom")

tests/run/cpp_iterators.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from libcpp.vector cimport vector
 from cython.operator cimport dereference as deref
@@ -89,6 +90,6 @@ def test_iteration_in_generator_reassigned():
                 vint = new vector[int]()
                 vint.push_back(2)
     finally:
-        del orig_vint
         if vint is not orig_vint:
             del vint
+        del orig_vint

tests/run/cpp_namespaces.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 cdef extern from "cpp_namespaces_helper.h" namespace "A":
     ctypedef int A_t

tests/run/cpp_nested_templates.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from cython.operator cimport dereference as deref
 

tests/run/cpp_operators.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from cython cimport typeof
 

tests/run/cpp_stl.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 cdef extern from "vector" namespace "std":
 

tests/run/cpp_stl_conversion.pyx

-# tag: cpp
-## Re-enable once our buildbot gcc is upgraded to a less-than-seven year old release.
-## distutils: extra_compile_args=-std=c++0x
+# mode: run
+# tag: cpp, werror
+# distutils: extra_compile_args=-std=c++0x
 
 import sys
 from libcpp.map cimport map
-#from libcpp.unordered_map cimport unordered_map
+from libcpp.unordered_map cimport unordered_map
 from libcpp.set cimport set as cpp_set
-#from libcpp.unordered_set cimport unordered_set
+from libcpp.unordered_set cimport unordered_set
 from libcpp.string cimport string
 from libcpp.pair cimport pair
 from libcpp.vector cimport vector
@@ -162,17 +162,17 @@ def test_set(o):
     cdef cpp_set[long] s = o
     return s
 
-#def test_unordered_set(o):
-#    """
-#    >>> sorted(test_unordered_set([1, 2, 3]))
-#    [1, 2, 3]
-#    >>> sorted(test_unordered_set([1, 2, 3, 3]))
-#    [1, 2, 3]
-#    >>> type(test_unordered_set([])) is py_set
-#    True
-#    """
-#    cdef unordered_set[long] s = o
-#    return s
+def test_unordered_set(o):
+   """
+   >>> sorted(test_unordered_set([1, 2, 3]))
+   [1, 2, 3]
+   >>> sorted(test_unordered_set([1, 2, 3, 3]))
+   [1, 2, 3]
+   >>> type(test_unordered_set([])) is py_set
+   True
+   """
+   cdef unordered_set[long] s = o
+   return s
 
 def test_map(o):
     """
@@ -182,13 +182,13 @@ def test_map(o):
     cdef map[int, double] m = o
     return m
 
-#def test_unordered_map(o):
-#    """
-#    >>> test_map({1: 1.0, 2: 0.5, 3: 0.25})
-#    {1: 1.0, 2: 0.5, 3: 0.25}
-#    """
-#    cdef unordered_map[int, double] m = o
-#    return m
+def test_unordered_map(o):
+   """
+   >>> test_map({1: 1.0, 2: 0.5, 3: 0.25})
+   {1: 1.0, 2: 0.5, 3: 0.25}
+   """
+   cdef unordered_map[int, double] m = o
+   return m
 
 def test_nested(o):
     """

tests/run/cpp_stl_string.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 cimport cython
 

tests/run/cpp_stl_string_ascii_auto_encoding.pyx

 # mode: run
-# tag: cpp
+# tag: cpp, werror
 # cython: c_string_encoding=ascii, c_string_type=unicode
 
 cimport cython

tests/run/cpp_stl_string_ascii_auto_encoding_str.pyx

 # mode: run
-# tag: cpp
+# tag: cpp, werror
 # cython: c_string_encoding=ascii, c_string_type=str
 
 cimport cython

tests/run/cpp_template_subclasses.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from cython.operator import dereference as deref
 from libcpp.pair cimport pair

tests/run/cpp_type_inference.pyx

-# tag: cpp
+# mode: run
+# tag: cpp, werror
 
 from cython cimport typeof