[Haskell-cafe] Conditional compilation for different versions of GHC?

[Henning Thielemann]

Jason Dagit schrieb:

> I see that others have provided answers on here, but another way is to
> change the check from:
> 
>    if flag(ghc7)
>        build-depends:   base                      >= 4.3      && < 5
>        cpp-options:     -DGHC7
>    else
>        build-depends:   base                      >= 4        && < 4.3
> 
> to this:
>    if impl(ghc >= 7)
>        build-depends:   base                      >= 4.3      && < 5
>        cpp-options:     -DGHC7
>    else
>        build-depends:   base                      >= 4        && < 4.3

Isn't it better to move the dependency on 'base' out of the If block? I
mean, someone might succeed to use GHC-7 with base-4.2 or GHC<7 or a
different compiler with base-4.3.