I installed the SourceGraph package using cabal:
cabal install SourceGraph
It was installed perfectly without any errors.
Now, I've created a file called Test.hs to test if I am able to import this package and use it. These are the contents of Test.hs:
module Test where
import SourceGraph
main = putStrLn "Hello World!"
When I do ghc Test I get the following error:
Could not find the module 'SourceGraph'
When I do ghc-pkg list I cannot find SourceGraph in the list, though all dependencies installed along with it are visible.
I checked in C:\Users\MyName\AppData\Roaming\cabal\packages\hackage.haskell.org and I can see the SourceGraph folder there.
But there is no .conf file for SourceGraph in C:\Users\MyName\AppData\Roaming\ghc\x86_64-mingw32-7.10.2\package.conf.d.
Also, all the .log files in C:\Users\MyName\AppData\Roaming\cabal\logs have a line In-place registering packagename-version... at the end, but SourceGraph-0.7.0.7,log doesn't.
Help please?
[System Specifications: GHCi version 7.10.2, Cabal Version: 1.22.4.0, OS: Windows 8 Pro, Processor: Intel Core i5 (64 bit)]
SourceGraph is not a library, it is a program to be run on the command line.
See it's hackage page
There it says (with added $s for the bash prompt):
To use SourceGraph, call it as either:
$ SourceGraph path/to/Foo.cabal
Or, if your project doesn't use Cabal, then there is limited support for > using an overall module from your program/library:
$ SourceGraph path/to/Foo.hs
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 have been trying to run a simple Haskell program using TDFA. The program is as follows:
import Control.Monad
import Data.Array
import qualified Data.Text as T
import Text.Regex
import Text.Regex.TDFA
import Text.Regex.Base
str = "abbbbaab" :: String
regex = "(a+)(b+)" :: String
main = do
if str (=~) :: regex then putStrLn "matched" else putStrLn "no matches"
when I try to run the above program using the command like: ghc test.hs -o test and then I am getting the following error (test.hs is the Haskell program which contains the above code):
Text/Regex/TDFA/NewDFA/Engine.hs:13:33: parse error on input ‘#’
Note that I have the latest version of TDFA installed on my pc. I did it by following ways:
ghc --make -o setup Setup.hs
Also, I did the following:
user#user-VirtualBox:~/regex-tdfa-master$ sudo cabal install regex-tdfa
[sudo] password for user:
Resolving dependencies...
All the requested packages are already installed:
regex-tdfa-1.2.2
Use --reinstall if you want to reinstall anyway.
I even tried it with the Makefile which I got from TDFA's github repository:
user#user-VirtualBox:~/regex-tdfa-master$ make
ghc -o setup --make ./Setup.hs
./setup clean
cleaning...
./setup configure --prefix=/Users/user/local/devel/trl --enable-library-profiling --user
Configuring regex-tdfa-1.2.2...
./setup build
Building regex-tdfa-1.2.2...
Preprocessing` library regex-tdfa-1.2.2...
[ 1 of 23] Compiling Text.Regex.TDFA.NewDFA.Uncons ( Text/Regex/TDFA/NewDFA/Uncons.hs, dist/build/Text/Regex/TDFA/NewDFA/Uncons.o )
...........(Skipped to make the things short here)..............................
[23 of 23] Compiling Text.Regex.TDFA ( Text/Regex/TDFA.hs, dist/build/Text/Regex/TDFA.o )
Text/Regex/TDFA.hs:60:8:
Could not find module ‘Text.Regex.Base’
Perhaps you haven't installed the profiling libraries for package ‘regex-base-0.93.2#regex_47KXx9dLqeO8MNJeizLKhP’?
Use -v to see a list of the files searched for.
Text/Regex/TDFA/ByteString.hs:24:8:
Could not find module ‘Text.Regex.Base.Impl’
Perhaps you haven't installed the profiling libraries for package ‘regex-base-0.93.2#regex_47KXx9dLqeO8MNJeizLKhP’?
Use -v to see a list of the files searched for.
Text/Regex/TDFA/CorePattern.hs:37:8:
Could not find module ‘Control.Monad.RWS’
Perhaps you haven't installed the profiling libraries for package ‘mtl-2.2.1#mtl_Aue4leSeVkpKLsfHIV51E8’?
Use -v to see a list of the files searched for.
Text/Regex/TDFA/ReadRegex.hs:13:8:
`Could not find module ‘Text.ParserCombinators.Parsec’`
Perhaps you haven't installed the profiling libraries for package ‘parsec-3.1.9#parse_EE5NO1mlYLh4J8mgDEshNv’?
Use -v to see a list of the files searched for.
Text/Regex/TDFA/String.hs:23:8:
Could not find module ‘Text.Regex.Base.RegexLike’`
Perhaps you haven't installed the profiling libraries for package ‘regex-base-0.93.2#regex_47KXx9dLqeO8MNJeizLKhP’?
Use -v to see a list of the files searched for.
Text/Regex/TDFA/TDFA.hs:10:8:`
Could not find module ‘Control.Monad.State’
Perhaps you haven't installed the profiling libraries for package ‘mtl-2.2.1#mtl_Aue4leSeVkpKLsfHIV51E8’?
Use -v to see a list of the files searched for.
Makefile:16: recipe for target 'build' failed
make: *** [build] Error 1
user#user-VirtualBox:~/regex-tdfa-master$
However, nothing worked. Hence, any help would be so appreciated...
Text/Regex/TDFA/NewDFA/Engine.hs:13:33: parse error on input ‘#’
On an initial note, this error points to a module of the regex-tdfa package, so you should have gotten it when building the package, rather than when building your test.hs, unless you were trying to build test.hs after putting it within the package source tree. In any case, line 13 of the mentioned file is:
import GHC.Prim(MutableByteArray#,RealWorld,Int#,sizeofMutableByteArray#,unsafeCoerce#)
The # names require the MagicHash GHC extension to be enabled. As there is no {-# LANGUAGE MagicHash #-} pragma at the beginning of the file, one should assume the extension is enabled through the .cabal file of the package, and that is indeed the case. That being so, your problem seems to be that you are attempting use the package modules straight from the source tree, without using an appropriate build tool such as Cabal. (Note that if you did successfully run cabal install regex-tdfa there should be no need of dealing with the source tree: ghc --make -o test test.hs should be enough.)
P.S.: There is an error in your test.hs. The last line should be...
if str =~ regex then putStrLn "matched" else putStrLn "no matches"
(I did manage to run it after this correction.)
It looks like you are compiling your program from within Regex-TDFA source code. I am able to reproduce your problem if I do cabal unpack regex-tdfa && cd regex-tdfa-1.2.2 && ghc --make test.hs.
The error happens because when GHC finds Regex-TDFA source files in the current directory, it just picks them and tries to compile, as if they were ordinary source files belonging to your project. However, Regex-TDFA cannot be built with simple ghc --make: in order to build it, you have to run cabal first. Cabal will read regex-tdfa.cabal file that contains the list of the necessary GHC extensions.
In particular, parse error happens because GHC extension MagicHash is missing (that's where the hash # comes from).
The "fix" is to move your test.hs to some other location: then GHC will use system package for Regex-TDFA.
I'm working on a project and I'm using Cabal for management. I've specified directory of source files, modules, all the stuff. All my files have the same names as their corresponding modules, case is preserved.
I can do:
$ cabal configure
$ cabal build
without problems.
However, imagine I have a module Module in file Module.hs, and file File.hs in the same directory. Now, when I'm trying to load File.hs from Emacs for testing, I get the following:
____Could not find module ‘Module’
It is a member of the hidden package ‘ghc-7.8.3’.
Use -v to see a list of the files searched for.
Failed, modules loaded: none.
Full contents of File.hs:
module File where
import Module
How to make it find files of my project?
You can launch the REPL via Cabal like so:
# cabal repl
This is the same as running ghci, but will take into account any additional dependencies installed by cabal install your local or sandbox package repository.
You need to tell GHCi where to find your source files. For example, if your project directory is ./foo and you have your source files in ./foo/src you need to say (from your project directory):
:set -isrc
at the command prompt in GHCi. You will then have access to private members in your sourc file loaded with C-c C-l.
You also need to make sure that you haven't cabal installed your package, otherwise the package will be loaded, not the project source files.
I had the same problem, fixed it, and decided to write about my troubleshooting. This might help new people learning Haskell. Read on.
I was playing around with this example code.
http://zvon.org/other/haskell/Outputdirectory/getCurrentDirectory_f.html
Code:
import Directory
main = aaa "/tmp/FOO"
aaa ddd = do createDirectory ddd
setCurrentDirectory ddd
d <- getCurrentDirectory
print d
writeFile "aaa" "HELLO"
l <- getDirectoryContents d
print l
I noticed that they are using this package.
https://hackage.haskell.org/package/directory-1.3.6.2/docs/System-Directory.html
So I installed it with this commands:
cabal update
cabal install directory
Compiling the example code with ghc failed with this error message.
Could not find module `Directory'
Use -v to see a list of the files searched for.
|
4 | import Directory
| ^^^^^^^^^^^^^^^^
I was stuck for a while until I changed the import line to this:
import System.Directory
After this change ghc could compile successfully.
Conclussion: are you sure you are importing properly?
I have a package named commands. I want to install it into its own sandbox e.g. .cabal-sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d/commands-0.0.0-f3f84f48f42ac74a69ee5fd73512bfd0.conf. currently, there is just one .hi interface file for one module Commands, I don't know how it got there.
I tried cabal install commands, by the logic of "that's how the other packages got there I think", but it fails with unknown package.
I also tried stuff with ghc-pkg like ghc-pkg update commands -f .cabal-sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d but I'm not using them right. ideally, I'd like to do this with cabal.
the last thing I tried was ghc -idist/build/, but it complained about the package names in the interface files being different, command versus main ("... differs from name found in the interface file ..."). and if I faked the executable's package with ghc -package-name commands-0.0.0, the linker complained that it couldn't find the symbol _ZCMain_main_closure, because every executable needs the function main in the module Main in the package main.
I'm sure there's a better way of doing this.
I followed online examples for my cabal file:
$ cat commands.cabal
name: commands
library
exposed-modules: Commands.Types, Commands.Bits
...
the minimal failing code example is just:
$ cat Main.hs
import Commands.Types
main = return ()
in the root project directory.
Context: I need to build my executable with make (not cabal) because it links to foreign code (Objective-C via language-c-inline). my makefile: https://github.com/sboosali/Haskell-DragonNaturallySpeaking/blob/master/Makefile). thus, I have to compile a script explicitly. I don't know how to compile the executable with cabal, but I want cabal to build and test and manage my library.
By putting my package into the sandbox, I will be able to import its modules from the script, by compiling with cabal exec -- ghc. I will also be able to include the script with extra-source-files at least, and know it will work.
Here's what I'd try:
First unregister any previous commands library. Try
ghc-pkg --global unregister commands
Install new commands to your sandbox.
From your sandbox directory, try this:
cabal --enable-shared --disable-documentation --prefix=./ install /path/to/your/library/source
Note the prefix specification.
I nuked it (rm -fr .cabal-sandbox/), reinstalled everything (cabal install --only-dependencies), added itself as a source (cabal sandbox add-source .), installed it (cabal install command). and then make worked. idk...
I finally made it to install Haskell SDL bindings on Windows. Using this:
> $env:Path += ";C:\SDL;C:\SDL\bin;C:\SDL\include;C:\SDL\lib"
> cabal install SDL --extra-include-dirs="C:\SDL\include" --extra-lib-dirs="C:\SDL\lib"
This works, as long as Cygwin is installed for the configure script. However, I wrote a tiny test script:
import Graphics.UI.SDL as SDL
import Control.Monad (void)
import Control.Exception (bracket_)
main = bracket_ (SDL.init [InitEverything]) quit $ do
screen <- setVideoMode 800 600 0 []
SDL.flip screen
void $ waitEvent
Trying this now gives me this error message:
*Main> :main
Loading package SDL-0.6.4 ... <interactive>: mingw32: Cannot find specified module.
can't load .so/.DLL for: mingw32.dll (addDLL: could not load DLL)
Now I was looking for that mingw32.dll but I couldn't find it on my computer, though I have MinGW32 installed. Does anyone have had any experience here?
Using SDL-0.6.4, GHC 7.4.2 from Haskell Platform 2012.4.0.0. Windows 7 64-Bit.
ADDITION: I have now also tried it in the way A Haskell Adventure In Windows recommends, and that has the very same result.
It may be a 64 vs. 32 bit issue. Try copying that .dll to:
64-bit version of Windows: copy to c:\windows\syswow64
32-bit version of Windows: copy to c:\windows\system32
That helped me with FTGL - see here
I used MSYS/MinGW to build, and I was having the exact same problem. After fiddling around I found that the flag -lmingw32 (in the file sdl-config) is being used, and this seems to imply mingw32.dll. I simple remove this flagged, and everything worked.