GHC API: Using runGhc twice or from multiple threads?

[Benno Fünfstück]

Hello,

is the following safe to do?

main = do
  runGhc libdir $ do ...
  runGhc libdir $ do ...

Or will this cause trouble? Is there state that is shared between the two
calls?

And what about this one:

main = do
   forkIO $ runGhc libdir $ do ...
   forkIO $ runGhc libdir $ do ...
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