I'd like to add that if you install vanilla cabal from the tarball, the installation process already installs several libraries that need to be reinstalled later with profiling enabled, even if you enable the  configuration flag. For this I found convenient to start the cabal installation as

  EXTRA_CONFIGURE_OPTS="--enable-library-profiling" ./bootstrap.sh

Petr

Dne 24. 7. 2014 10:30 "Henning Thielemann" <schlepptop@henning-thielemann.de> napsal(a):
Am 24.07.2014 01:18, schrieb Andrew Pennebaker:

Fortunately, cabal can reinstall a library with profiling support, with:

cabal install --reinstall -p <library>

Unfortunately, cabal is a bit of a simpleton, so this will fail unless
that libraries dependencies are also installed with profiling enabled:

cabal install --reinstall -p <libraryX> <libraryY> <libraryZ> ...

You may obtain a list of dependent packages with ghc-pkg-dep from
   http://hackage.haskell.org/package/cabal-sort

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