This is kind of a hack that relies on the directory structure that Cabal
#12479: build fail of commercialhaskell.com with stack build on mac os x sierra beta 4 -------------------------------------+------------------------------------- Reporter: stephenb | Owner: Type: bug | Status: infoneeded Priority: normal | Milestone: 8.0.2 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: MacOS X | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: #12198 | Differential Rev(s): Phab:D2532 Wiki Page: | -------------------------------------+------------------------------------- Comment (by duncan): produces to be effective, but it has the advantage of being a local change. Cabal would also need some similar change in order for the final libraries that it links to be loadable. Unfortunately, in general it is the user/builder calling Cabal that gets to choose the layout, so it's hard to pick a fixed scheme. That said, we can in principle compute an optimal (or near-optimal) set of shared prefixes. We start with the info from the ghc-pkg db (InstalledPackageInfo) which has the full path to the libraries (or enough info to compute it). Then we would take the set of those paths, make a trie, count the number of elements beneath each trie node and take as shared prefixes all the ones with a count of > 1. Or something like that. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12479#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler