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Ömer Sinan Ağacan authored
Previously `splitEnv` worked like this: > splitEnv "foo:::bar::baz:" ["foo","","","bar","","baz",""] with this patch: > splitEnv working_dir "foo:::bar:baz:" ["foo",working_dir,working_dir"bar","baz",working_dir] This fixes #14695, where having a trailing `:` in the env variable caused ghci to pass empty `-B` parameter to `gcc`, which in turned caused the next parameter (`--print-file-name`) to be considered as the argument to `-B`. As a result ghci did not work. The `working_dir` argument is to have a similar behavior with POSIX: according to chapter 8.3 zero-length prefix means current working directory. Reviewers: hvr, bgamari, AndreasK, simonmar Reviewed By: bgamari, AndreasK, simonmar Subscribers: AndreasK, rwbarton, thomie, carter GHC Trac Issues: #14695 Differential Revision: https://phabricator.haskell.org/D4330
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