#16360: GHC fails when GHC_PACKAGE_PATH contains trailing slash -------------------------------------+------------------------------------- Reporter: nh2 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: GHC doesn't work Unknown/Multiple | at all Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When the directory given in `GHC_PACKAGE_PATH` contains a trailing slash, GHC stops working completely. For example, this works: {{{ env GHC_PACKAGE_PATH=/raid/src/ghc/ghc-atomic- writes/_build/stage1/lib/package.conf.d /raid/src/ghc/ghc-atomic- writes/_build/stage1/bin/ghc "--make" "-outputdir" "example-programs- build/" "example-programs/Hello.hs" "-o" "example-programs-build/haskell- hello" }}} but adding a trailing `/` like `GHC_PACKAGE_PATH=/path/to/package.conf.d/` fails: {{{ env GHC_PACKAGE_PATH=/raid/src/ghc/ghc-atomic- writes/_build/stage1/lib/package.conf.d/ /raid/src/ghc/ghc-atomic- writes/_build/stage1/bin/ghc "--make" "-outputdir" "example-programs- build/" "example-programs/Hello.hs" "-o" "example-programs-build/haskell- hello" }}} {{{ [1 of 1] Compiling Main ( example-programs/Hello.hs, example- programs-build/Main.o ) [Prelude changed] example-programs/Hello.hs:1:1: error: Could not find module ‘Prelude’ There are files missing in the ‘base-4.12.0.0’ package, try running 'ghc-pkg check'. Use -v (or `:set -v` in ghci) to see a list of the files searched for. | 1 | main :: IO () | ^ }}} This is surprising; most programs accept trailing slashes where directories are expected, and shells ofthen TAB-complete directories this way. It wastes developer time when they don't notice. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16360 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler