:set -O does not work in .ghci file

{-# OPTIONS_GHC -Wall #-}

module Foo where
        
testFromTo :: Int -> Int
testFromTo n = length ([0..(10^n)] :: [Int])

 cat ~/.ghci
:set +s
:set -fobject-code 
:set -O
bash-3.2$ touch Foo.hs
bash-3.2$ ghci
GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /Users/gcolpitts/.ghci
Prelude> :load Foo
:load Foo
[1 of 1] Compiling Foo              ( Foo.hs, Foo.o )
Ok, modules loaded: Foo (Foo.o).
(0.15 secs,)
Prelude Foo> testFromTo 5
testFromTo 5
100001
(0.02 secs, 8,885,888 bytes)
Prelude Foo> :quit
:quit
Leaving GHCi.
bash-3.2$ touch Foo.hs
bash-3.2$ ghci -fobject-code -O
GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /Users/gcolpitts/.ghci
Prelude> :load Foo
:load Foo
[1 of 1] Compiling Foo              ( Foo.hs, Foo.o )
Ok, modules loaded: Foo (Foo.o).
(0.15 secs,)
Prelude Foo> testFromTo 5
testFromTo 5
100001
(0.02 secs, 98,400 bytes)

While supplying -fobject-code -O as an argument to ghci seems like an easy workaround; it isn't feasible, as far as I know, when using emacs thus setting priority to normal rather than low.