A.hs

module A where

import B

data X = X Y deriving (Show)

B.hs

module B where

data Y = Z deriving (Show)

config

-- This is the configuration file for the 'cabal' command line tool.

-- The available configuration options are listed below.
-- Some of them have default values listed.

-- Lines (like this one) beginning with '--' are comments.
-- Be careful with spaces and indentation because they are
-- used to indicate layout for nested sections.


remote-repo: hackage.haskell.org:http://hackage.haskell.org/packages/archive
remote-repo-cache: /home/me/.cabal/packages
-- local-repo:
-- logs-dir:
world-file: /home/me/.cabal/world
-- verbose: 1
-- compiler: ghc
-- with-compiler:
-- with-hc-pkg:
-- scratchdir:
-- program-prefix: 
-- program-suffix: 
-- library-vanilla: True
-- library-profiling: False
-- shared:
-- executable-dynamic: False
-- executable-profiling: False
-- optimization: True
-- library-for-ghci: False
-- split-objs: False
-- executable-stripping: True
-- user-install: True
-- package-db:
-- flags:
-- extra-include-dirs:
-- extra-lib-dirs:
extra-prog-path: /home/me/.cabal/bin
-- tests: False
-- library-coverage: False
-- benchmarks: False
-- cabal-lib-version:
-- constraint:
-- preference:
-- solver: choose
-- documentation: False
-- doc-index-file: $datadir/doc/index.html
-- max-backjumps: 200
-- reorder-goals: False
-- shadow-installed-packages:
-- reinstall: False
-- avoid-reinstalls: False
-- force-reinstalls: False
-- upgrade-dependencies: False
-- root-cmd:
-- symlink-bindir:
build-summary: /home/me/.cabal/logs/build.log
-- build-log:
remote-build-reporting: anonymous
-- one-shot: False
jobs: $ncpus
-- username:
-- password:

install-dirs user
  -- prefix: /home/me/.cabal
  -- bindir: $prefix/bin
  -- libdir: $prefix/lib
  -- libsubdir: $arch-$os-$compiler/$pkgid
  -- libexecdir: $prefix/libexec
  -- datadir: $prefix/share
  -- datasubdir: $arch-$os-$compiler/$pkgid
  -- docdir: $datadir/doc/$arch-$os-$compiler/$pkgid
  -- htmldir: $docdir/html
  -- haddockdir: $htmldir
  -- sysconfdir: $prefix/etc

install-dirs global
  -- prefix: /usr/local
  -- bindir: $prefix/bin
  -- libdir: $prefix/lib
  -- libsubdir: $arch-$os-$compiler/$pkgid
  -- libexecdir: $prefix/libexec
  -- datadir: $prefix/share
  -- datasubdir: $arch-$os-$compiler/$pkgid
  -- docdir: $datadir/doc/$arch-$os-$compiler/$pkgid
  -- htmldir: $docdir/html
  -- haddockdir: $htmldir
  -- sysconfdir: $prefix/etc

program-locations 
  -- alex-location:
  -- ar-location:
  -- c2hs-location:
  -- cpphs-location:
  -- ffihugs-location:
  -- gcc-location:
  -- ghc-location:
  -- ghc-pkg-location:
  -- greencard-location:
  -- haddock-location:
  -- happy-location:
  -- hmake-location:
  -- hpc-location:
  -- hsc2hs-location:
  -- hscolour-location:
  -- hugs-location:
  -- jhc-location:
  -- ld-location:
  -- lhc-location:
  -- lhc-pkg-location:
  -- nhc98-location:
  -- pkg-config-location:
  -- ranlib-location:
  -- strip-location:
  -- tar-location:
  -- uhc-location:

program-default-options 
  -- alex-options:
  -- ar-options:
  -- c2hs-options:
  -- cpphs-options:
  -- ffihugs-options:
  -- gcc-options:
  -- ghc-options:
  -- ghc-pkg-options:
  -- greencard-options:
  -- haddock-options:
  -- happy-options:
  -- hmake-options:
  -- hpc-options:
  -- hsc2hs-options:
  -- hscolour-options:
  -- hugs-options:
  -- jhc-options:
  -- ld-options:
  -- lhc-options:
  -- lhc-pkg-options:
  -- nhc98-options:
  -- pkg-config-options:
  -- ranlib-options:
  -- strip-options:
  -- tar-options:
  -- uhc-options:

output.txt

$ cabal build
./test.cabal has been changed. Re-configuring with most recently used options.
If this fails, please run configure manually.
Resolving dependencies...
Configuring test-0.1.0.0...
Building test-0.1.0.0...
Preprocessing library test-0.1.0.0...
[1 of 2] Compiling B                ( B.hs, dist/build/B.o )
[2 of 2] Compiling A                ( A.hs, dist/build/A.o )
/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/../../../../x86_64-pc-linux-gnu/bin/ld: dist/build/A.dyn_o: wa\
rning: relocation against `testzm0zi1zi0zi0_B_zdfShowY2_closure' in readonly section `.text'.
/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/../../../../x86_64-pc-linux-gnu/bin/ld: dist/build/A.dyn_o: re\
location R_X86_64_PC32 against undefined symbol `testzm0zi1zi0zi0_B_zdfShowY2_closure' can not be use\
d when making a shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/../../../../x86_64-pc-linux-gnu/bin/ld: final link failed: Bad\
 value
collect2: error: ld returned 1 exit status

test.cabal

-- Initial test.cabal generated by cabal init.  For further documentation, 
-- see http://haskell.org/cabal/users-guide/
                                                                                                      
name:                test
version:             0.1.0.0
-- synopsis:            
-- description:         
-- license:             
-- author:              
-- maintainer:          
-- copyright:           
-- category:            
build-type:          Simple
-- extra-source-files:  
cabal-version:       >=1.10

library
  exposed-modules:     A
  -- other-modules:       
  -- other-extensions:    
  build-depends:       base >=4.7 && <4.8
  -- hs-source-dirs:      
  default-language:    Haskell2010