Repeated #include in ghci broken?

[Lennart Augustsson]

Perhaps the warnings are bad?
(You can use #undef to avoid them.)

  -- Lennart

2009/3/10 Conal Elliott <conal at conal.net>:
> Do ghc and ghci handle CPP differently?  In ghci, I'm getting "phase `C
> pre-processor' failed (exitcode = 1)" when I #include the same .h file more
> than once in a module.  I also get warnings about a symbol being redefined,
> although I'm careful to #undef them it the end of the include file.  All
> works fine with ghc.
>
> Here's my code:
>
>     #define APPLICATIVE Vec1
>     #include "ApplicativeNumeric-inc.hs"
>
>     #define APPLICATIVE Vec2
>     #include "ApplicativeNumeric-inc.hs"
>
>     #define APPLICATIVE Vec3
>     #include "ApplicativeNumeric-inc.hs"
>
>     #define APPLICATIVE Vec4
>     #include "ApplicativeNumeric-inc.hs"
>
> And here are the error messages in ghci:
>
>     Graphics/Shady/Vec.hs:134:0:
>      error: ApplicativeNumeric-inc.hs: No such file or directory
>
>     Graphics/Shady/Vec.hs:136:0:  warning: "APPLICATIVE" redefined
>
>     Graphics/Shady/Vec.hs:133:0:
>      warning: this is the location of the previous definition
>
>     Graphics/Shady/Vec.hs:139:0:  warning: "APPLICATIVE" redefined
>
>     Graphics/Shady/Vec.hs:136:0:
>      warning: this is the location of the previous definition
>
>     Graphics/Shady/Vec.hs:142:0:  warning: "APPLICATIVE" redefined
>
>     Graphics/Shady/Vec.hs:139:0:
>      warning: this is the location of the previous definition
>     phase `C pre-processor' failed (exitcode = 1)
>
> Any ideas?  Suggestions?
>
>   - Conal
>
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