Cabal Bug
Lemmih
lemmih at gmail.com
Tue Apr 5 16:05:57 EDT 2005
On Apr 5, 2005 9:59 PM, Dominic Steinitz
<dominic.steinitz at blueyonder.co.uk> wrote:
> When I try to build using
>
> ./Setup build
>
> I get the following error:
>
> Compiling Codec.Encryption.DESAux ( ./Codec/Encryption/DESAux.hs,
> dist/build/./Codec/Encryption/DESAux.o )
>
> ./Codec/Encryption/DESAux.hs:19:0:
> Illegal instance declaration for `Num [Bool]'
> (The instance type must be of form (T a b c)
> where T is not a synonym, and a,b,c are distinct type variables)
> In the instance declaration for `Num [Bool]'
>
> ./Codec/Encryption/DESAux.hs:21:0:
> Illegal instance declaration for `Bits [Bool]'
> (The instance type must be of form (T a b c)
> where T is not a synonym, and a,b,c are distinct type variables)
> In the instance declaration for `Bits [Bool]'
>
> So I added
>
> Ghc-options: -fglasgow-exts
>
> to the cabal file. Now this module compiles but I still get the same error on
> a different module and I know -fglasgow-exts allows this to compile when I do
> it by hand.
>
> ./Codec/ASN1/TLV.hs:140:0:
> Illegal instance declaration for `Binary (State ([Octet], Offset))'
> (The instance type must be of form (T a b c)
> where T is not a synonym, and a,b,c are distinct type variables)
> In the instance declaration for `Binary (State ([Octet], Offset))'
>
> In fact, this seems to be the second time this module has been compiled and
> the first it completed successfully.
>
> Compiling Codec.ASN1.TLV ( ./Codec/ASN1/TLV.hs,
> dist/build/./Codec/ASN1/TLV.o )
> Compiling Codec.ASN1.X509 ( ./Codec/ASN1/X509.hs,
> dist/build/./Codec/ASN1/X509.o )
>
> Why is cabal recompiling sources and why am I getting errors on the second
> compilation?
Pass '-v' to the Setup script to see how Cabal calls GHC.
--
Friendly,
Lemmih
More information about the Libraries
mailing list