Hi all,
On behalf of the cabal maintainers and contributors I'm proud to announce the Cabal (and cabal-install) 1.18.0 release. To install run
cabal update && cabal install Cabal-1.18.0 cabal-install-1.18.0
With 854 commits since the last release there are two many improvements and bug fixes to list them here, but two highlights are:
* Hermetic builds using sandboxes. This should reduce the number of "dependency hell" and broken package DB problems.
[>>] I was quite happy to hear of the new cabal - and the chance to escape the various mazes of cabal-dependency problems. But I seem to have a bootstrapping problem, the new cabal won't install to help me get out of its messes! I tried to install what I thought were its complaints (below), and they seemed OK - any hints? The key problem seems to be: " mtl-2.1.2-5337caef659244e51e2f5fb2e944d97f is shadowed by package mtl-2.1.2-678980f6077e9f83a86186556aa2a425" Not sure how this happened, or how to remedy it. Cabal FAQ says to unregister the user database version, but that notes that it would break about 20+ other packages, but do it anyway. So yes, I did and now have a bigger mess it seems. Now mtl install gives: Building mtl-2.1.2... Preprocessing library mtl-2.1.2... Bad interface file: E:\Plang\Haskell Platform\lib\extralibs\transformers-0.3.0.0\ghc-7.4.2\Control\Monad\Trans\Error.hi mismatched interface file versions (wanted "7063", got "7042") Failed to install mtl-2.1.2 cabal: Error: some packages failed to install: mtl-2.1.2 failed during the building phase. The exception was: ExitFailure 1 I am reluctant to do a clean restart install, since it was so much trouble building some packages like wx and other graphics .dll packages. Argh... --------------------------------------------------------------------------------------------------- C:\Users\guthrie>cabal update Downloading the latest package list from hackage.haskell.org Note: there is a new version of cabal-install available. To upgrade, run: cabal install cabal-install C:\Users\guthrie>cabal install cabal-install Resolving dependencies... Downloading Cabal-1.18.0... [ 1 of 70] Compiling Distribution.PackageDescription.Utils ... [70 of 70] Compiling Main ( C:\Users\guthrie\AppData\Local\Temp\Cabal-1.18.0-13108\Cabal-1.18.0\Setup.hs, C:\Users\guthrie\AppData\Local\Temp\Cabal-1.18.0-13108\Cabal-1.18.0\dist\setup\Main.o ) Linking C:\Users\guthrie\AppData\Local\Temp\Cabal-1.18.0-13108\Cabal-1.18.0\dist\setup\setup.exe ... Configuring Cabal-1.18.0... Building Cabal-1.18.0... Preprocessing library Cabal-1.18.0... [ 1 of 72] Compiling Paths_Cabal ... Distribution\Version.hs:125:1: Warning: Orphan instance: instance Data Version In-place registering Cabal-1.18.0... Installing library in C:\Users\guthrie\AppData\Roaming\cabal\i386-windows-ghc-7.6.3\Cabal-1.18.0 Registering Cabal-1.18.0... Installed Cabal-1.18.0 Downloading cabal-install-1.18.0... Configuring cabal-install-1.18.0... Warning: This package indirectly depends on multiple versions of the same package. This is highly likely to cause a compile failure. ... package mtl-2.1.2 requires transformers-0.3.0.0 package mtl-2.1.2 requires transformers-0.3.0.0 Building cabal-install-1.18.0... Preprocessing executable 'cabal' for cabal-install-1.18.0... <command line>: cannot satisfy -package-id mtl-2.1.2-5337caef659244e51e2f5fb2e944d97f: mtl-2.1.2-5337caef659244e51e2f5fb2e944d97f is shadowed by package mtl-2.1.2-678980f6077e9f83a86186556aa2a425 (use -v for more information) Failed to install cabal-install-1.18.0 cabal: Error: some packages failed to install: cabal-install-1.18.0 failed during the building phase. The exception was:ExitFailure 1 C:\Users\guthrie>cabal install mtl Resolving dependencies... All the requested packages are already installed: mtl-2.1.2 Use --reinstall if you want to reinstall anyway. C:\Users\guthrie>cabal install transformers Resolving dependencies... All the requested packages are already installed: transformers-0.3.0.0 Use --reinstall if you want to reinstall anyway.