cabal

Haskell newbie and Python guy here. I think I may be missing something here but if you look at Yesod's quickstart , the autor install some packages before cabal sandbox init . I have seen the same pattern elsewhere. Questions: Am I missing something? Is this the real way to use cabal sandbox? Why can't (or shouldn't) I install yesod-bin inside a sandbox? What if I use different versions of yesod-bin throughout some projects? If there is some libraries that install binaries inside .cabal-sandbox/bin, why cabal sandbox init don't change PATH in order to match the sandboxed version? Thank you

I'm a newbie to haskell and cabal, so I'm probably missing something simple. I updated cabal-install: sudo cabal install cabal-install Password: Resolving dependencies... Configuring cabal-install-1.22.0.0... Building cabal-install-1.22.0.0... Installed cabal-install-1.22.0.0 Updating documentation index However cabal --version says: cabal-install version 1.18.0.5 using version 1.18.1.4 of the Cabal library What happened to cabal-install 1.22.0.0? There are two ways of making cabal install packages globally. Note that, as a result, cabal may require sudo. This command will install <PACKAGE>

I am working on the "roman-numerals" task from the exercism Haskell track and followed their instructions to installing stack . I am working on a Fedora 24 box. As long as I was working with Haskell modules from base, I didn't have a problem. Now I am trying to import the Data.Map module. It works fine using the ghci command line: $ ghci GHCi, version 7.8.4: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> import Data.Map Prelude Data.Map> However, when I

I have a cabal package that exports a type NBT which might be useful for other developers. I've gone through the trouble of defining an Arbitrary instance for my type, and it would be a shame to not offer it to other developers for testing their code that integrates my work. However, I want to avoid situations where my instance might get in the way. Perhaps the other developer has a different idea for what the Arbitrary instance should be. Perhaps my package's dependency on a particular version of QuickCheck might interfere with or be unwanted in the dependencies of the client project. My

Over here is the only reason I can find that packages I'm installing using cabal are not being found by GHC: This happens when you install a package globally, and the previous packages were installed locally. Note that cabal-install install locally by default [...] Presumably, "local installation" means putting packages in ~/.cabal/ . First question: where are global installs? I've been running cabal using sudo , so I guess that's a global install? The reason I've been doing this is that it complains about permissions when run without sudo , so this contradicts the statement "cabal-install

I've created a Haskell package that makes FFI calls to functions defined in CUDA code. I'd like to compile .cu file to an object (.o) file during package build and force linker to link it in. So far, I tried to use a technique found this question . I've customized buildHook to: run nvcc run default buildHook create ar library file with nvcc compiled code. Setup.hs is available here . This solution has a major disadvantage in restricting this package to static linking. Although cabal produces a shared library, it won't work because it has no way of resolving symbols located in the object file.

I have a program written in Haskell and intended to be compiled with GHC. The program scales very well on multiple cores, so enabling multithreading is very important. In my .cabal file I've added ghc-options: -O3 -threaded to link with the threaded runtime. The problem is that with this approach the user would need to run the program with foo +RTS -N , which seems a bit cryptic and not very user friendly. How can I tell cabal/ghc to enable those runtime flags invisibly to the user? I've read about --with-rtsopts , but GHC (7.0.3) just spits out unrecognized flag when I try to use it. The flag

I have installed Haskell Platform 2012 in Windows 7. I write in the console cabal update and I take a message that there is a new version of cabal. I write cabal install cabal-install . After installation finishes it tells me that the cabal has been installed in C:\username\AppData\Roaming\cabal. So when I do cabal update again I am taking the same message that I have to install the new version of cabal. I have tried to change the cabal directory from the config file but cabal ignores the config file. Is Haskell working only on Unix? Thanks Mikhail Glushenkov The problem is that the cabal