On FreeBSD, use -lthr instead of -pthread for now (see comments)

diff --git a/compiler/main/StaticFlags.hs b/compiler/main/StaticFlags.hs
index b49323b..4c9c5e8 100644 (file)
--- a/compiler/main/StaticFlags.hs
+++ b/compiler/main/StaticFlags.hs
@@ -488,8 +488,13 @@ way_details :: [ (WayName, Way) ]
 way_details =
   [ (WayThreaded, Way "thr" True "Threaded" [
 #if defined(freebsd_TARGET_OS)
-         "-optc-pthread"
-        , "-optl-pthread"
+--       "-optc-pthread"
+--      , "-optl-pthread"
+       -- FreeBSD's default threading library is the KSE-based M:N libpthread,
+       -- which GHC has some problems with.  It's currently not clear whether
+       -- the problems are our fault or theirs, but it seems that using the
+       -- alternative 1:1 threading library libthr works around it:
+         "-optl-lthr"
 #elif defined(solaris2_TARGET_OS)
           "-optl-lrt"
 #endif