When g++ is not there, don't allow linker that need it.

I still allow the vm and vm_nogc linker, but I'm not sure the current version will work, but we can fix it.

When g++ is not there, don't allow linker that need it.
fa0ef1a8 · Frederic · f5bc7fc1 · fa0ef1a8
--- a/theano/configdefaults.py
+++ b/theano/configdefaults.py
@@ -138,8 +138,7 @@ except OSError:
    AddConfigVar('linker',
                 ("Default linker used if the theano flags mode is Mode "
                  "or ProfileMode"),
-                 EnumStr('py', 'c|py', 'c', 'c|py_nogc', 'c&py',
-                     'vm', 'cvm', 'vm_nogc', 'cvm_nogc'),
+                 EnumStr('py', 'vm', 'vm_nogc'),
                 in_c_key=False)
    _logger.warning('g++ not detected ! Theano will be unable to execute '
            'optimized C-implementations (for both CPU and GPU) and will '