Enable debugging of kernels.

theano/sandbox/cuda/nvcc_compiler.py

@@ -303,7 +303,7 @@ class NVCC_compiler(object):
         preargs2 = [pa for pa in preargs
                     if pa not in preargs1]  # other arguments
 
-        cmd = [nvcc_path, '-shared', '-g'] + preargs1
+        cmd = [nvcc_path, '-shared', '-g', '-G'] + preargs1
         if config.nvcc.compiler_bindir:
             cmd.extend(['--compiler-bindir', config.nvcc.compiler_bindir])