Commit 7acee066 authored by Simon Marlow's avatar Simon Marlow

Avoid calling newDynFlags when there are no changes

This is a small optimisation for :set and :unset
parent fa70b1ec
......@@ -2564,7 +2564,7 @@ setOptions wds =
let (plus_opts, minus_opts) = partitionWith isPlus wds
mapM_ setOpt plus_opts
-- then, dynamic flags
newDynFlags False minus_opts
when (not (null minus_opts)) $ newDynFlags False minus_opts
packageFlagsChanged :: DynFlags -> DynFlags -> Bool
packageFlagsChanged idflags1 idflags0 =
......@@ -2661,7 +2661,7 @@ unsetOptions str
mapM_ unsetOpt plus_opts
no_flags <- mapM no_flag minus_opts
newDynFlags False no_flags
when (not (null no_flags)) $ newDynFlags False no_flags
isMinus :: String -> Bool
isMinus ('-':_) = True
......
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