[Haskell-cafe] Fwd: Error compiling transformers-base-0.4.1 (debian 64 bits, ghc-7.4.2)

[jean-christophe mincke]

Hello again,

After some more investigation, it seems that conditional compilation does
not work properly.

All pragmas such as

#if some-cabal-defined-macro (...)

always evaluate to true.

I made sure to have cpphs installed but that did not solve my problem.

Any idea?

Thank you

Regards

J-C

---------- Forwarded message ----------
From: jean-christophe mincke <jeanchristophe.mincke at gmail.com>
Date: Thu, May 9, 2013 at 7:08 PM
Subject: Fwd: [Haskell-cafe] Error compiling transformers-base-0.4.1
(debian 64 bits, ghc-7.4.2)
To: "haskell-cafe at haskell.org" <haskell-cafe at haskell.org>




Thank you Sjoerd,

Unfortunately this does not work.

I think the problem is linked to the evaluation of the condition (in
Base.hs)

#if !MIN_VERSION_base(4,4,0) && HS_TRANSFORMERS_BASE__ORPHANS

Just as a test, I modified the file and added the following lines

A. negation of min_version
#if *!*MIN_VERSION_base(4,4,0)
rgfyfgruyfgreuy  -- making sure the compilation fails
#endif

B
#if MIN_VERSION_base(4,4,0)
rgfyfgruyfgreuy  -- making sure the compilation fails
#endif

In both case the compilations failed (cabal clean, configure, build).  That
is, it seems that the #if always evaluate to true...

I am surely missing something here...

Regards

J-C



On Thu, May 9, 2013 at 4:13 PM, Sjoerd Visscher <sjoerd at w3future.com> wrote:

> There's a flag to turn it off, does that work? Try cabal install
> transformers-base -f-OrphanInstances
>
> Sjoerd
>
> On May 9, 2013, at 2:47 PM, jean-christophe mincke <
> jeanchristophe.mincke at gmail.com> wrote:
>
> Hello Café
>
> I am running into problems  when installing transformers-base-0.4.1.
>
> Has anyone an idea about what is going on?
>
> REM : this is a "brand new" debian install, I have just install ghc, cabal
> install cabal-install etc.
>
> Thank you
>
> very much
>
> J-C
>
> cabal install transformers-base
> Resolving dependencies...
> Downloading transformers-base-0.4.1...
> Configuring transformers-base-0.4.1...
> Preprocessing library transformers-base-0.4.1...
> Building transformers-base-0.4.1...
> [1 of 1] Compiling Control.Monad.Base ( src/Control/Monad/Base.hs,
> dist/build/Control/Monad/Base.o )
>
> src/Control/Monad/Base.hs:63:10:
>     Duplicate instance declarations:
>       instance Applicative (L.ST <http://l.st/> s)
>         -- Defined at src/Control/Monad/Base.hs:63:10
>       instance Applicative (L.ST <http://l.st/> s) -- Defined in
> `Control.Applicative'
>
> src/Control/Monad/Base.hs:67:10:
>     Duplicate instance declarations:
>        instance Applicative (S.ST <http://s.st/> s)
>         -- Defined at src/Control/Monad/Base.hs:67:10
>       instance Applicative (S.ST <http://s.st/> s) -- Defined in
> `Control.Applicative'
> cabal: Error: some packages failed to install:
> transformers-base-0.4.1 failed during the building phase. The exception
> was:
> ExitFailure 1
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