Skip tests that require C++ when there is no compiler.

theano/gof/tests/test_types.py

@@ -252,6 +252,8 @@ class TestEnumTypes(TestCase):
         assert ref == out, (ref, out)
 
     def test_op_with_cenumtype(self):
+        if theano.config.cxx == '':
+            raise SkipTest('need c++')
         sizeof_int = MyOpCEnumType('int')()
         sizeof_float = MyOpCEnumType('float')()
         sizeof_long_long = MyOpCEnumType('long long')()

theano/gof/tests/test_vm.py

@@ -441,6 +441,8 @@ def test_reallocation():
 
 
 def test_no_recycling():
+    if theano.config.cxx == '':
+        raise SkipTest('need c++')
     x = theano.tensor.vector()
     for lnk in [vm.VM_Linker(use_cloop=True),
                 vm.VM_Linker(use_cloop=False, lazy=True),

theano/tensor/nnet/tests/test_abstract_conv.py

@@ -770,6 +770,10 @@ class TestAbstractConvNoOptim(BaseTestConv2d):
                            mode=mode)
 
     def tcase_gi(self, i, f, o, s, b, flip, provide_shape, fd=(1, 1), expect_error=False):
+
+        if not theano.config.cxx:
+            raise SkipTest("Need cxx to test conv2d")
+
         mode = theano.Mode(optimizer=None)
         if not expect_error:
             self.run_gradinput(inputs_shape=i, filters_shape=f,
@@ -904,6 +908,9 @@ class TestCpuConv2d(BaseTestConv2d):
                           filter_dilation=fd)
 
     def tcase_gi(self, i, f, o, s, b, flip, provide_shape, fd=(1, 1), expect_error=False):
+        if not theano.config.cxx:
+            raise SkipTest("Need cxx to test conv2d")
+
         if fd != (1, 1):
             raise SkipTest("No dilation implementation for basic cpu ConvOp.")
         mode = self.mode