I am having an issue with building a shared library with ghc and I think I need to rebuild my haskell packages with --enable-shared, is there an easy way to rebuild all of my packages with cabal with the flag --enable-shared?
If you have a ~/.cabal/world, cabal install --reinstall --enable-shared world could work, but test with the --dry-run flag first. That will, however only take care of cabal-installed packages. If you have packages installed with your distro's package manager, the distro might also provide shared versions for those (otherwise, you'd have to do it manually). Also, it would probably be helpful to set shared: True in ~/.cabal/config.
来源：https://stackoverflow.com/questions/7981350/cabal-rebuild-all-with-enable-shared-flag