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Here's how the rube goldberg machine triggered the old bug: 1. If you have a file gmp/config.mk.in, then Cabal will create a generated file in $DIST/build/gmp/config.mk 2. When you attempt to load inplace integer-gmp via GHCi, it will ask gcc (aka clang on OS X) for the file name of 'gmp', with base directory set to $DIST/build 3. There is a folder named 'gmp', and so this folder is returned as the 'library' for gmp 4. GHCi loadArchive chokes to death trying to open a library that is actually a folder This patch solves the problem by breaking the chain at (1): if we don't put config.mk in a folder named gmp, NO PROBLEM. Signed-off-by: Edward Z. Yang <ezyang@fb.com> Test Plan: validate Reviewers: angerman, hvr, bgamari Reviewed By: angerman Subscribers: erikd, thomie, carter GHC Trac Issues: #14972 Differential Revision: https://phabricator.haskell.org/D4552
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