On 14/10/2009 04:43, Antoine Latter wrote:
On Sun, Oct 11, 2009 at 3:41 PM, Ian Lynagh<ig...@earth.li> wrote:
Hi all,
We are pleased to (finally!) announce the first release candidate
for GHC 6.12.1:
http://darcs.haskell.org/~ghc/dist/6.12.1rc1/
As well as the source tarball:
ghc-6.12.0.20091010-src.tar.bz2
there are installers for Windows (i386) and OS X (i386), and binary
distributions for x86_64/Linux and i386/Linux. For the Linux binary
distributions, the "linux-n" tarballs are recommended over the "linux"
tarballs.
Please test as much as possible; bugs are much cheaper if we find them
before the release!
Here is my tale of woe. I'm running this on Mac OS X 10.6.
I tried to install the syb-with-class package off of hackage, which
initially failed because of the changes to the template-haskell
package installed with 6.12.1rc1.
So I think to myself "Oh! I'll just put an upper bound on the version
of template-haskell used in the .cabal file for syb, and install the
old version off of hackage".
The current version of template-haskell installs fine on 6.12.1rc1
with a couple minor tweaks (to compensate for StringConstr not being
present in Data.Data anymore).
But then when I try to build syb-with-class against the old
template-haskell lib I get the following error:
$ ./Setup build
Preprocessing library syb-with-class-0.5.1...
Building syb-with-class-0.5.1...
[3 of 4] Compiling Data.Generics.SYB.WithClass.Derive (
Data/Generics/SYB/WithClass/Derive.hs,
dist/build/Data/Generics/SYB/WithClass/Derive.o )
Data/Generics/SYB/WithClass/Derive.hs:23:0:
Bad interface file:
/Users/alatter/.cabal/lib/template-haskell-2.3.0.1/ghc-6.12.0.20091010/Language/Haskell/TH.hi
Something is amiss; requested module
template-haskell-2.3.0.1:Language.Haskell.TH differs from name found
in the interface file template-haskell:Language.Haskell.TH
<<<<<
Has anyone seen this before? Are there any tools I can use to peer
into .hi files to get more information about what could be wrong?
template-haskell is a one of the packages that we call "wired-in",
because GHC needs to generate references to some of the things that it
defines. To make GHC independent of the version of the template-haskell
package, we internally strip off the version number when referring to
template-haskell.
Now, this doesn't completely explain the error you're seeing. When it
starts up, GHC has to decide which template-haskell package is the
"wired-in" one, and my guess is that it picked the other one (because it
is newer). You could find out by running GHC with the -v flag. I think
GHC is assuming that when you have multiple versions of a wired-in
package that the older ones are wrappers around the newer ones (like
base-3 and base-4), but that assumption doesn't hold in your case.
Installing a new version of a wired-in package is going to be
problematic, but we ought to be able to at least improve the diagnostics.
Cheers,
Simon
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