[GHC] #13002: :set -O does not work in .ghci file

[GHC]

#13002: :set -O does not work in .ghci file
-------------------------------------+-------------------------------------
        Reporter:  George            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  RecompilationCheck
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Description changed by George:

Old description:

> {{{#!hs
> {-# 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 that isn't feasible as far as I know when using emacs
> thus setting priority to normal rather than low.

New description:

 {{{#!hs
 {-# 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.

--

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13002#comment:7>
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