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Since #847 we have used libthr due to reported hangs with FreeBSD's KSE-based M:N pthread implementation. However, this was nearly 12 years ago and today libpthread seems to work fine. Moreover, adding -lthr to the linker flags break when used in conjunction with -r when gold is used (since -l and -r are incompatible although BFD ld doesn't complain). Test Plan: Validate on FreeBSD Reviewers: kgardas, austin Subscribers: rwbarton, thomie GHC Trac Issues: #847 Differential Revision: https://phabricator.haskell.org/D3773
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