[commit: ghc] wip/use-O2: Change `OPTIONS_GHC -O` to `OPTIONS_GHC -O2` (fc6f584)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : wip/use-O2
Link       : http://ghc.haskell.org/trac/ghc/changeset/fc6f58477fe0ecdc5ede3d6b7e6590caacb926ef/ghc

>---------------------------------------------------------------

commit fc6f58477fe0ecdc5ede3d6b7e6590caacb926ef
Author: Douglas Wilson <douglas.wilson at gmail.com>
Date:   Mon Nov 6 16:50:39 2017 -0500

    Change `OPTIONS_GHC -O` to `OPTIONS_GHC -O2`
    
    These pragmas were having the perverse effect of having these
    performance
    critical modules be LESS optimized in builds with -O2.
    
    Test Plan: Check on gipedia whether this is worthwhile.
    
    Reviewers: austin, bgamari
    
    Subscribers: rwbarton, thomie
    
    Differential Revision: https://phabricator.haskell.org/D4156


>---------------------------------------------------------------

fc6f58477fe0ecdc5ede3d6b7e6590caacb926ef
 compiler/iface/BinIface.hs     | 2 +-
 compiler/utils/Binary.hs       | 2 +-
 compiler/utils/Encoding.hs     | 2 +-
 compiler/utils/FastMutInt.hs   | 2 +-
 compiler/utils/FastString.hs   | 2 +-
 compiler/utils/StringBuffer.hs | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/compiler/iface/BinIface.hs b/compiler/iface/BinIface.hs
index 8ab2310..31b5af0 100644
--- a/compiler/iface/BinIface.hs
+++ b/compiler/iface/BinIface.hs
@@ -4,7 +4,7 @@
 --  (c) The University of Glasgow 2002-2006
 --
 
-{-# OPTIONS_GHC -O #-}
+{-# OPTIONS_GHC -O2 #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected
 
diff --git a/compiler/utils/Binary.hs b/compiler/utils/Binary.hs
index a7bbfd5..c3c8ae3 100644
--- a/compiler/utils/Binary.hs
+++ b/compiler/utils/Binary.hs
@@ -5,7 +5,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE MultiWayIf #-}
 
-{-# OPTIONS_GHC -O -funbox-strict-fields #-}
+{-# OPTIONS_GHC -O2 -funbox-strict-fields #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected
 
diff --git a/compiler/utils/Encoding.hs b/compiler/utils/Encoding.hs
index f809ba9..b4af686 100644
--- a/compiler/utils/Encoding.hs
+++ b/compiler/utils/Encoding.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE BangPatterns, MagicHash, UnboxedTuples #-}
-{-# OPTIONS_GHC -O #-}
+{-# OPTIONS_GHC -O2 #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected
 
diff --git a/compiler/utils/FastMutInt.hs b/compiler/utils/FastMutInt.hs
index 6ba139a..20206f8 100644
--- a/compiler/utils/FastMutInt.hs
+++ b/compiler/utils/FastMutInt.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE BangPatterns, MagicHash, UnboxedTuples #-}
-{-# OPTIONS_GHC -O #-}
+{-# OPTIONS_GHC -O2 #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected
 --
diff --git a/compiler/utils/FastString.hs b/compiler/utils/FastString.hs
index fde4ff0..f16b327 100644
--- a/compiler/utils/FastString.hs
+++ b/compiler/utils/FastString.hs
@@ -2,7 +2,7 @@
 
 {-# LANGUAGE BangPatterns, CPP, MagicHash, UnboxedTuples,
     GeneralizedNewtypeDeriving #-}
-{-# OPTIONS_GHC -O -funbox-strict-fields #-}
+{-# OPTIONS_GHC -O2 -funbox-strict-fields #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected
 
diff --git a/compiler/utils/StringBuffer.hs b/compiler/utils/StringBuffer.hs
index 0840210..39941e2 100644
--- a/compiler/utils/StringBuffer.hs
+++ b/compiler/utils/StringBuffer.hs
@@ -7,7 +7,7 @@ Buffers for scanning string input stored in external arrays.
 -}
 
 {-# LANGUAGE BangPatterns, CPP, MagicHash, UnboxedTuples #-}
-{-# OPTIONS_GHC -O #-}
+{-# OPTIONS_GHC -O2 #-}
 -- We always optimise this, otherwise performance of a non-optimised
 -- compiler is severely affected