Support ghci options like -fobject-code and -fno-code

[3noch]

-fobject-code is necessary if you want to use unboxed sums in your code.

[ali-abrar]

Resolved by #529

[dfordivam]

It seems this is not working, here is the code to test on skeleton project The ob run will fail

# LANGUAGE UnboxedSums #-}
module Common.Api where

commonStuff :: String
commonStuff = "Here is a string defined in Common.Api"
  where 
   testval :: (# Int | Bool #)

and in common.cabal

  ghc-options: -Wall -fobject-code

common/src/Common/Api.hs:9:4: warning: [-Wunused-local-binds]
    Defined but not used: ‘testval’
  |
9 |    testval = (# | True #)
  |    ^^^^^^^
Error: bytecode compiler can't handle unboxed tuples and sums.
  Possibly due to foreign import/export decls in source.
  Workaround: use -fobject-code, or compile this module to .o separately.

[dfordivam]

well the reason I want to use the -fobject-code is to make ghci faster, and I hope that will also work once this is fixed.

[Ericson2314]

My guess is the issue is that -fobject-code needs to be used for the entire GHCi session, and so the stuff that would set package flags just on those modules is too smart.

[dfordivam]

The options -fobject-code and -fno-code are intended for the GHCi session only, as they are not relevant for the native compilation.

So adding them to the .cabal file sounds like a bad idea. ob run should provide a separate mechanism to specifying these.