Issue a warning when to_sdfg() ignores the auto_optimize flag (Issue …

…#1380). (#1395)

As it was discussed the ignoring of the `auto_optimize` flag in
`to_sdfg()` is intentional. To make it clear to the user the function
now issues a warning in this case.

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Co-authored-by: Philip Mueller, KY <philip.paul.mueller@bluemail.ch>
Co-authored-by: Tal Ben-Nun <tbennun@users.noreply.github.com>

dace/frontend/python/parser.py

@@ -240,6 +240,9 @@ def to_sdfg(self, *args, simplify=None, save=False, validate=False, use_cache=Fa
             warnings.warn("You are calling to_sdfg() on a dace program that "
                           "has set 'recompile' to False. "
                           "This may not be what you want.")
+        if self.autoopt == True:
+            warnings.warn("You are calling to_sdfg() on a dace program that "
+                          "has set `auto_optimize` to True. Automatic optimization will not be applied.")
 
         if use_cache:
             # Update global variables with current closure