bug: building dependencies with cabal "new-build" and profiling

[bitc]

Edit @ezyang. Simplified the test case; you only need to depend on bifunctors or one of the Kmett packages. Seems to be related to custom setup.

Compiling my project with profiling does not work. A test cabal file is pasted below. Running the following:

$ cabal new-build --enable-profiling --enable-library-profiling

stops building dependencies half way through, and when I look at the log file ~/.cabal/logs/bifunctors-5.3.log I see at the bottom:

src/Data/Bifunctor/Tannen.hs:35:8:
    Could not find module ‘Control.Comonad’
    Perhaps you haven't installed the profiling libraries for package ‘comonad-5@comon_BPwjoCtOoUPAMJakPkbNa0’?
    Use -v to see a list of the files searched for.

When I run the command again, it tries again to build the failed dependencies, and fails in the same way. Running plain cabal new-build works fine.

Here is a complete test case. Run this as root on a fresh Ubuntu 14.04 install:

#!/bin/bash

# Install ghc and cabal-install
add-apt-repository -y ppa:hvr/ghc
apt-get update
apt-get install -y ghc-7.10.3 ghc-7.10.3-prof cabal-install-1.24

# Add a regular unix user
useradd -m -s /bin/bash -U captain
echo "PATH=/opt/ghc/7.10.3/bin:/opt/cabal/1.24/bin:"'$PATH' >> /home/captain/.profile

cat << 'EOF' | sudo -u captain -i
  cabal update
  mkdir test
  cd test
  curl -O https://gist.githubusercontent.com/bitc/b9a75eec6da145b5a151254bcc906a53/raw/6e68a763dba63ff8f32026a8d1ab90ec6504d33b/test.cabal
  cabal new-build
  echo "Finished regular new-build with exit code: $?"
  cabal new-build --enable-profiling --enable-library-profiling
  echo "Finished prof new-build with exit code: $? (but check the logs!)"
EOF

test.cabal

name:                test
version:             0.1.0.0
license:             BSD3
license-file:        LICENSE
author:              captain
maintainer:          <>
build-type:          Simple
extra-source-files:  ChangeLog.md
cabal-version:       >=1.10

library
  exposed-modules:
  build-depends:       base,
                       bifunctors
  hs-source-dirs:      src
  default-language:    Haskell2010

[23Skidoo]

/cc @dcoutts

[ezyang]

Confirm that I can reproduce.

[ezyang]

Known facts:

• It seems to be related to bifunctors/comonad using a Custom setup
• If you make these packages inplace the problem goes away
• If you look at the installs in the store, there are no profiling objects

Current hypothesis: Cabal 1.22 didn't know how to install profiling objects; Cabal 1.24 does know how, so we need to force a newer custom setup in this case.

[ezyang]

OK, hypothesis verified. Workaround: add constraints: Cabal >= 1.24 to your Cabal file.

[ezyang]

OK this is a dupe of #3790 which diagnoses the problem more directly.

[23Skidoo]

Closing in favour of #3790, which has been now fixed.