Am working through Real World Haskell and am trying to install regex-posix-0.95.2 from an untar[ed] package by simplying running
cabal install
I then see:
Text/Regex/Posix/Wrap.hsc:141:1: error:
Could not find module ‘Text.Regex.Base.RegexLike’
There are files missing in the ‘regex-base-0.93.2’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
|
141 | import Text.Regex.Base.RegexLike(RegexOptions(..),RegexMaker(..),RegexContext(..),MatchArray)
Despite the fact that I can load this in ghci with
Prelude> :module Text.Regex.Base.RegexLike
Prelude Text.Regex.Base.RegexLike>
Prelude> import Text.Regex.Base.RegexLike(RegexOptions(..),RegexMaker(..),RegexContext(..),MatchArray)
Prelude Text.Regex.Base.RegexLike>
and see it in the module-system.
[warrick#warrick-pc regex-posix-0.95.2]$ ghc-pkg find-module Text.Regex.Base.RegexLike
/usr/lib/ghc-8.6.2/package.conf.d
regex-base-0.93.2
Why is this failing?
What are some more general tips and tricks when trying to debug cabal failures you'd recommend (as this is one instance of many issues I'm consistently having with Cabal)?
This is a linking issue. For example, some distributions like Arch use dynamic linking by default, without static libraries, but without additional configuration, cabal tries to link statically, which results in the kind of message you are seeing. For more information: https://wiki.archlinux.org/index.php/Haskell
Related
I tried running my program which uses Haskell QuickCheck via ghc MyProgramm.hs , but received the following error:
$ ghc Ex2.hs
[1 of 1] Compiling Ex2 ( Ex2.hs, Ex2.o )
Ex2.hs:21:1: error:
Could not find module ‘Test.QuickCheck’
There are files missing in the ‘QuickCheck-2.11.3’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
|
21 | import Test.QuickCheck (
| ^^^^^^^^^^^^^^^^^^^^^^^^...
I installed stack, ran stack update and stack install QuickCheck without issue but the error persisted. Then, I ran cabal install QuickCheck and got the following errors:
$ cabal install QuickCheck
Resolving dependencies...
Configuring QuickCheck-2.12.4...
Building QuickCheck-2.12.4...
Failed to install QuickCheck-2.12.4
Build log ( /home/username/.cabal/logs/ghc-8.4.3/QuickCheck-2.12.4-3d2YDDqfPBn4BfmTJbpJXK.log ):
cabal: Entering directory '/tmp/cabal-tmp-9133/QuickCheck-2.12.4'
Configuring QuickCheck-2.12.4...
Preprocessing library for QuickCheck-2.12.4..
Building library for QuickCheck-2.12.4..
[ 1 of 16] Compiling Test.QuickCheck.Exception ( Test/QuickCheck/Exception.hs, dist/build/Test/QuickCheck/Exception.o )
[ 2 of 16] Compiling Test.QuickCheck.Random ( Test/QuickCheck/Random.hs, dist/build/Test/QuickCheck/Random.o )
Test/QuickCheck/Random.hs:10:1: error:
Could not find module ‘System.Random’
There are files missing in the ‘random-1.1’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
|
10 | import System.Random
| ^^^^^^^^^^^^^^^^^^^^
Test/QuickCheck/Random.hs:11:1: error:
Could not find module ‘System.Random.TF’
There are files missing in the ‘tf-random-0.5’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
|
11 | import System.Random.TF
| ^^^^^^^^^^^^^^^^^^^^^^^
Test/QuickCheck/Random.hs:12:1: error:
Could not find module ‘System.Random.TF.Gen’
There are files missing in the ‘tf-random-0.5’ package,
try running 'ghc-pkg check'.
Use -v to see a list of the files searched for.
|
12 | import System.Random.TF.Gen(splitn)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-9133/QuickCheck-2.12.4'
cabal: Error: some packages failed to install:
QuickCheck-2.12.4-3d2YDDqfPBn4BfmTJbpJXK failed during the building phase. The
exception was:
ExitFailure 1
However, I already have the arch packages haskell-random, haskell-tf-random and haskell-mwc-random installed. Does anybody know how to fix this?
Edit: I also ran cabal install random --reinstall.
Problem
On Archlinux as of 2022-09-17, pacman -S ghc cabal-install will install
system packages that provide only dynamic files (.so, .dyn_hi) in
installed packages inside /usr/lib/ghc-*; static files (.a, .hi) are (for
the most part) missing. However, the default cabal configuration enables static file
building. Unfortunately, upstream cabal-install doesn't track whether or not
static files are available inside installed packages. It just assumes they
are, and when they are gone, it fails with errors such as you have found:
[1 of 1] Compiling Main ( Main.hs, ../setup.dist/work/depender/dist/build/depender/depender-tmp/Main.o )
Main.hs:3:1: error:
Could not find module `Dynamic'
There are files missing in the `dynamic-1.0' package,
try running 'ghc-pkg check'.
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
| import qualified Dynamic (number)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Workaround
A quick workaround just to get up and running quickly is to disable static file
building, which is by default enabled. (Note that trying to pass package-local
flags to disable static file with e.g. --enable-shared --enable-executable-dynamic --disable-library-vanilla (which is how most if
not all current Archlinux Haskell packages seem to build packages, e.g. with
https://github.com/archlinux/svntogit-community/blob/master/haskell-scientific/trunk/PKGBUILD)
building using cabal-install may be ignored due to another, related bug; but
~/.cabal/config is a safe bet.) You may do so by adding 3 lines to
~/.cabal/config in the appropriate location:
library-vanilla: False
shared: True
executable-dynamic: True
(Alternatively, consider using alternative tools like stack.)
More complete solution
For a more long-term solution, one option involves 2 pieces: 1) one or more
system packages that provide all types of build artifacts, static and dynamic,
for the base, foundational packages (from GHC and cabal-install), at least as an option besides dynamic-only packages (secondary Haskell packages are optional,
since cabal-install can rebuild these with needed build artifacts (static or
dynamic)), and 2) patching cabal-install (and ghc-pkg, which can handle .conf
files recording information about installed packages) to track whether static
files are available, and to be aware of these when resolving dependencies so
that cabal-install knows when to prefer rebuild a source package with needed
build artifact configuration over an already installed package that doesn't
provid required build artifacts.
There is a merge request (I submitted) that provides such a patchset, called
fix-dynamic-deps, at https://github.com/haskell/cabal/pull/8461. For users
running into exactly the problem that you described (myself included), I also
created an AUR package that provides both pieces based on GHC 9.4.2 with Cabal
3.9.0.0 that includes my patchset (there is a mirror at
https://github.com/bairyn/ghc-cabal-arts.) It provides ghc and
cabal-install but includes both of these pieces.
Further reading
Here are a few more resources I wrote on or are related to this bug:
https://wiki.archlinux.org/index.php?title=Haskell&diff=745459&oldid=738269#Troubleshooting
https://github.com/haskell/cabal/pull/8461
https://github.com/bairyn/ghc-cabal-arts
https://github.com/bairyn/cabal/tree/fix-dynamic-builds
Even though I have a main = do and couldn't get it working that way, I was able to run my QuickCheck test as follows:
To run a quickCheck, first load your program with:
$ ghci MyProg.hs
Then to run the quickCheck, find the test you want to run, then run it with:
$ quickCheck my_quick_check
I tried using the primes module in Haskell and after running
$ cabal install primes
Resolving dependencies...
Notice: installing into a sandbox located at /home/christoph/.cabal-sandbox
Downloading primes-0.2.1.0...
Configuring primes-0.2.1.0...
Building primes-0.2.1.0...
Installed primes-0.2.1.0
I tried making a file with
import Data.Numbers.Primes
at the top, but every attempt to load it failed with the error message:
Could not find module ‘Data.Numbers.Primes’
Use -v to see a list of the files searched for.
The question: what am I missing here? there must be something wrong with this way of using it right?
After reading Haskell: where is Data.Numbers.Primes library? I also tried:
import Data.Primes
import primes
import Primes
but none of them worked.
Thank you in advance, any help is most welcome
Because you are installing the primes package to a sandbox, you will need to run the compiler with awareness of the sandbox. cabal offers the exec command for this, so e.g.
echo import Data.Numbers.Primes >foo.hs
cabal exec ghci foo.hs
from within the sandbox should work.
My haskell installation can not find bytestring module installed by operating system
$ ghci
GHCi, version 7.6.3: 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> :m +Data.ByteString.Lazy
<no location info>:
Could not find module `Data.ByteString.Lazy'
It is not a module in the current program, or in any known package.
But I have installed this module using yum:
$ rpm -ql ghc-bytestring
/usr/lib64/ghc-7.6.3/bytestring-0.10.0.2
/usr/lib64/ghc-7.6.3/bytestring-0.10.0.2/libHSbytestring-0.10.0.2-ghc7.6.3.so
/usr/share/doc/ghc-bytestring
/usr/share/doc/ghc-bytestring/LICENSE
What is wrong?
If this is happening, you should be able to figure out more via ghc-pkg list. This could happen, for example, if the binary package provided by your software repository was broken; ghc-pkg list would report that. In general, either GHC is not looking for packages in /usr/lib64/ghc-7.6.3/ or else that directory has a package.cache which was not updated to reflect the new package.
One thing that could cause GHC to look in the wrong place is if there are multiple GHCs on the machine: for example if which ghc reveals /usr/local/bin/ghc then you probably compiled GHC from source at some point and its packages are occupying some /usr/local/lib/ghc-7.6.3/package.conf.d/ folder, while your repository has installed /usr/bin/ghc which is looking in the folder you want.
Anyway, fixes: if the package.cache file exists and has a valid entry for the file, then you can run ghc -package-conf /path/to/package.cache ... to add those packages to your executable. If you have further problems, ghc -v ... is a great resource for debugging "which version of that package is being used here?" types of problems.
If the package.cache file does not exist then you've got a bigger problem, and probably the easiest way to move forward is to look for a directory under /home which appears on ghc-pkg list. Install the required package to that directory and GHC should pick up on it even though it doesn't understand these bigger contexts. You could also start working with a cabal sandbox of local packages to your project.
Situation here is similiar to C++ you have libraries used during dynamic linking stage and header used for compilation. In Fedora packages like ghc-bytestring are only libraries without headers. To install headers I had to install ghc-bytestring-devel package.
An example on Fedora 24:
server.hs:7:8:
Could not find module ‘Data.Text’
Perhaps you meant Data.Set (from containers-0.5.5.1)
Locations searched:
Data/Text.hs
Data/Text.lhs
So change to user root, then:
What packages are there?
# dnf search ghc|grep text
ghc-text.x86_64 : An efficient packed Unicode text type
ghc-boxes.x86_64 : 2D text pretty-printing library
ghc-pango.x86_64 : Binding to the Pango text rendering engine
ghc-css-text.x86_64 : CSS parser and renderer
ghc-hgettext.x86_64 : Haskell binding to libintl
ghc-attoparsec.x86_64 : Fast combinator parsing for bytestrings and text
ghc-text-devel.x86_64 : Haskell text library development files
ghc-blaze-textual.x86_64 : Fast rendering of common datatypes
ghc-css-text-devel.x86_64 : Haskell css-text library development files
ghc-hgettext-devel.x86_64 : Haskell hgettext library development files
ghc-blaze-textual-devel.x86_64 : Haskell blaze-textual library development files
So what's installed?
# rpm --query ghc-text
ghc-text-1.1.1.3-3.fc24.x86_64
# rpm --query ghc-text-devel
package ghc-text-devel is not installed
So let's install the devel package.
# dnf install ghc-text-devel
Installed:
ghc-text-devel.x86_64 1.1.1.3-3.fc24
...and compilation succeeds after that.
I'm trying to use http://hackage.haskell.org/package/persistent-1.2.3.0, but after installing it through "cabal install persistent", ghc doesn't find its exposed-modules:
Prelude> import Database.Persist.Types
<no location info>:
Could not find module `Database.Persist.Types'
It is not a module in the current program, or in any known package.
And ghc-pkg works fine:
$ ghc-pkg find-module Database.Persist.Types
/var/lib/ghc/package.conf.d
/home/apsk/.ghc/x86_64-linux-7.6.3/package.conf.d
persistent-1.2.3.0
Am I missing something or is this just a bug with cabal/persistent/ghc? My ghc is 7.6.3, btw.
Also, I've tried with no effect: "ghc-pkg recache"; "ghc-pkg check"; installing previous version; reinstalling with and without "sudo" and/or "--global".
Check that you're not using sandboxes, cabal-dev, hsenv, anything else that can influence ghc in looking for dependencies. Make sure you're using ghc/ghci, and not any wrappers, and that ghc/ghci are not aliased to anything in your shell.
Try to specify the package-db explicitly:
ghci -package-db /home/apsk/.ghc/x86_64-linux-7.6.3/package.conf.d
If you launch ghci with -v, it'll print the (caches of) databases it looks at, like this:
% ghci -v
GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help
Glasgow Haskell Compiler, Version 7.6.3, stage 2 booted by GHC version 7.4.2
Using binary package database: /opt/ghc763/lib/ghc-7.6.3/package.conf.d/package.cache
Using binary package database: /home/feuerbach/.ghc/i386-linux-7.6.3/package.conf.d/package.cache
Make sure that the database which has persistent is listed there.
Hopefully helpful to someone. Using ghci -v I looked to see if persistent was there, and saw this:
package persistent-2.0.8-cec952b1a61645f47dbec3b0b0cbcef4 is unusable due to missing or recursive dependencies: aeson-0.8.0.0-1bd8b5254a1dd30c0fe6acc346ad7de7 attoparsec-0.12.1.2-48393fcdbcf426085b696dc4409d9270 conduit-1.2.0.2-39f9cd0430ed7b7f4306899cbeb1ed83 monad-logger-0.3.7.2-3e6a80e9b3adf31497ff04514bdf2919 resource-pool-0.2.3.0-c02186641e7173f72887d5e65a646ac1 scientific-0.3.3.1-13e0eefbd7215e4503420c3d0a6fdb82 unordered-containers-0.2.5.0-147c3bb8f4a2da7d753455e75af30b92
So I looked around on SO (saw this: Haskell Cabal: Mysterious missing or recursive dependencies) but didn't find a great answer. I did find a good one here though:
$ ghc-pkg list Cabal
Which revealed I had 2 goddamn cabals! One in user and one in global. Ugh. So I was able to do ghc-pkg unregister --user Cabal-1.18.1.3 --force to get rid of the old one. Then cabal install cabal automatically went for 1.20, implicitly into user without any flag (the alternate would be --global).
The problem only occurs in GHCi, right? Have you restarted GHCi since installing persistent? (Maybe there's another way to get GHCi to pick up newly installed packages, but I'm not aware of it.
I want to use in my haskell project xml library (http://hackage.haskell.org/package/xml)
I downloaded it.then try to build and install:
runhaskell Setup.hs configure
runhaskell Setup.hs build
runhaskell Setup.hs install
All ok. There are no errors. When i try import modules from this lib to my project, for example:
import Text.XML.Light.Cursor
I get error:
/home/shk/dev/src/XMPP.hs:8:8:
Could not find module `Text.XML.Light.Cursor':
Use -v to see a list of the files searched for.
Failed, modules loaded: none.
What's wrong? How can i install and use library in haskell?
Thank you.
Copying from the mailing list:
First thing is to do 'ghc-pkg list'. If your package doesn't show up
then it's not installed, according to the package registry. 'cabal
install' should have registered it. If it is in the list, then it
depends how you're building. If you use ghc manually, then you have
to give '-package xyz'. If you use 'ghc --make', ghc will
automatically add the -package for you. If you use cabal, you put the
package in the dependencies, and 'cabal build' will add -package for
you.
If the package has parens, then someone hid it, and you'll have to do
'ghc-pkg expose' on it. If you're doing everything else right and it
still doesn't find the package, then you can run ghc -v and it'll
print lots of details. It might have something about 'hiding xyz
because of ', which means you're depending on
libraries that expect different versions of the underlying library.
You can sometimes get out of this by carefully upgrading or
downgrading certain libraries.