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Questions tagged [cabal]

Cabal is a package distribution and build system for the Haskell programming language.

Cabal stands for Common Architecture for Building Applications and Libraries. It is a package distribution and build system for the Haskell programming language. It is integrated with Hackage, a central package archive of open-source software written in Haskell. Cabal can refer both to the Cabal library which Setup.hs files can link against in order to build Haskell packages, and the command-line tool, which provides a range of additional functionality, including automatically fetching packages from , solving dependency graphs of version constraints to obtain install plans, managing sandboxed package environments, and much more.

More information about Cabal can be found at the Cabal website.

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How are `ghc-pkg` and `cabal` programs related? (Haskell)

As I know cabal is a program to manage installation of packages like FreeBSD's pkg_add. But there is another tool called ghc-pkg. I don't know why there are two different programs. What's the role of each of them and how are they related?
eonil
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Conventions for Stability field of Cabal packages

Cabal allows for a freeform Stability field: stability: freeform The stability level of the package, e.g. alpha, experimental, provisional, stable. What are the community conventions about these stability values? What is considered experimental…
sastanin
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Flags in cabal files

I am following the user-guide for package developing: https://www.haskell.org/cabal/users-guide/developing-packages.html#quickstart I got stuck in the Flags section. How do I pass flags to my files? Is it just at build time? I have tried to search…
Afonso Matos
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How to profile libraries?

Is there any hidden option that will put cost centres in libraries? Currently I have set up my profiling like this: cabal: ghc-prof-options: -O2 …
fho
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How to use HUnit and Cabal to do Automated Testing?

I've been fighting with Cabal for a good portion of a day trying to make its automated testing features work with HUnit. I've read the documentation here and here, and I have my Test-Suite section set up like it shows, but whenever I try and build…
Dwilson
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Statically link GMP to an Haskell application using GHC (+ LLVM)

How can I drop dynamic dependency on libgmp and go from this: linux-vdso.so.1 => (0x00007fffdccb1000) libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10 (0x00007fb01afc1000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6…
Cetin Sert
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How to upgrade gtk2hsC2hs?

I am trying cabal install glib-0.12.3 under my Ubuntu 11.10 using cabal-install 0.10.2. However, it shows the following error messages: setup: The program gtk2hsC2hs version >=0.13.5 is required but the version found at /usr/bin/gtk2hsC2hs is…
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How to handle feature requests that add new package dependencies

I am the maintainer of a package on hackage, lrucache. I recently received a feature request for adding instances for Binary and NFData. Both of those are useful things to have, and I have no issue with those instances, in principle. However, both…
Carl
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Haskell Cabal regenerate documentation for all installed packages

How can I generate and install documentation for all locally installed cabal packages? I turned on the documentation flag in ~/.cabal/config which means that all newly installed packages will have documentation also generated. But how to generate…
Anupam Jain
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Stack has not been tested with GHC & Cabal versions

In my Haskell project when I stack run, it is showing the following, but still runs. What warning is this? How can I get rid of it? Stack has not been tested with GHC versions above 8.6, and using 8.8.2, this may fail Stack has not been tested with…
Muhammadjon
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Using alex/happy with Cabal

I'm writing a compiler for a class I'm taking. The class isn't specifically Haskell but I'm using Haskell to write my compiler and interpreter. I have a cabal package setup to hopefully make it easy for my prof to run/compile. I have happy and alex…
Edward
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How to set ghci options for cabal repl?

I have a haskell project which I compile with -Werror by default. This means that when I run cabal repl it runs with the option -Werror turned on. This means that for example when I evaluate 2 + 2 I get the following error…
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Which Haskell package contains given module

I know a Haskell module name, but I can't figure out in what package it is defined. This is bad because I can't compile without a package exposing this module. Specificaly it is Text.Regex that I can't locate, but I would like to know how to solve…
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cabal FFI dependency

I am making a small Haskell game in Windows, where I would like to respond each time the user presses a key. Because getChar behaves strangely on Windows, I use FFI to get access to getch in conio.h, as described here. The relevant code is: foreign…
Boris
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Monadic expressions in conditionals - GHC compiles, cabal refuses

Been scratching my head for a day over this one. I have a few functions in my code that look like this: function :: IO (Maybe Whatever) function = do monadFun yaySomeIO status <- maybeItWillFail if checkStatus status -- Did we succeed? …
Colin Woodbury
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