Use -fwarn-tabs when validating

We only use it for "compiler" sources, i.e. not for libraries.
Many modules have a -fno-warn-tabs kludge for now.

32 files changed, 224 insertions, 0 deletions

diff --git a/compiler/codeGen/CgBindery.lhs b/compiler/codeGen/CgBindery.lhs
index 3cccbef310..65f8a52981 100644
--- a/compiler/codeGen/CgBindery.lhs
+++ b/compiler/codeGen/CgBindery.lhs
@@ -5,6 +5,13 @@
 \section[CgBindery]{Utility functions related to doing @CgBindings@}
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgBindery (
 	CgBindings, CgIdInfo,
 	StableLoc, VolatileLoc,
diff --git a/compiler/codeGen/CgCallConv.hs b/compiler/codeGen/CgCallConv.hs
index 345b65cd3c..0a3911ea82 100644
--- a/compiler/codeGen/CgCallConv.hs
+++ b/compiler/codeGen/CgCallConv.hs
@@ -9,6 +9,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgCallConv (
 	-- Argument descriptors
 	mkArgDescr, 
diff --git a/compiler/codeGen/CgCase.lhs b/compiler/codeGen/CgCase.lhs
index 0eace0d577..c3141f4fd7 100644
--- a/compiler/codeGen/CgCase.lhs
+++ b/compiler/codeGen/CgCase.lhs
@@ -4,6 +4,13 @@
 %
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgCase (	cgCase, saveVolatileVarsAndRegs, 
 		restoreCurrentCostCentre
 	) where
diff --git a/compiler/codeGen/CgClosure.lhs b/compiler/codeGen/CgClosure.lhs
index 32190a3c9c..85d629dbaf 100644
--- a/compiler/codeGen/CgClosure.lhs
+++ b/compiler/codeGen/CgClosure.lhs
@@ -9,6 +9,13 @@ with {\em closures} on the RHSs of let(rec)s.  See also
 @CgCon@, which deals with constructors.
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgClosure ( cgTopRhsClosure, 
 		   cgStdRhsClosure, 
 		   cgRhsClosure,
diff --git a/compiler/codeGen/CgExpr.lhs b/compiler/codeGen/CgExpr.lhs
index 5ffa4e550d..e69db9f61b 100644
--- a/compiler/codeGen/CgExpr.lhs
+++ b/compiler/codeGen/CgExpr.lhs
@@ -4,6 +4,13 @@
 %
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgExpr ( cgExpr ) where
 
 #include "HsVersions.h"
diff --git a/compiler/codeGen/CgExtCode.hs b/compiler/codeGen/CgExtCode.hs
index 5c56ee0bd5..c94f23701b 100644
--- a/compiler/codeGen/CgExtCode.hs
+++ b/compiler/codeGen/CgExtCode.hs
@@ -9,6 +9,13 @@
 -- to collect declarations as we parse the proc, and feed the environment
 -- back in circularly (to avoid a two-pass algorithm).
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgExtCode (
 	ExtFCode(..),
 	ExtCode,
diff --git a/compiler/codeGen/CgForeignCall.hs b/compiler/codeGen/CgForeignCall.hs
index 493b3a181b..295d76344a 100644
--- a/compiler/codeGen/CgForeignCall.hs
+++ b/compiler/codeGen/CgForeignCall.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgForeignCall (
   cgForeignCall,
   emitForeignCall,
diff --git a/compiler/codeGen/CgHeapery.lhs b/compiler/codeGen/CgHeapery.lhs
index 9e9cc8d1d8..03b5deb058 100644
--- a/compiler/codeGen/CgHeapery.lhs
+++ b/compiler/codeGen/CgHeapery.lhs
@@ -5,6 +5,13 @@
 \section[CgHeapery]{Heap management functions}
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgHeapery (
 	initHeapUsage, getVirtHp, setVirtHp, setRealHp, 
 	getHpRelOffset,	hpRel,
diff --git a/compiler/codeGen/CgInfoTbls.hs b/compiler/codeGen/CgInfoTbls.hs
index 305081d680..2ff422299b 100644
--- a/compiler/codeGen/CgInfoTbls.hs
+++ b/compiler/codeGen/CgInfoTbls.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgInfoTbls (
 	emitClosureCodeAndInfoTable,
 	emitInfoTableAndCode,
diff --git a/compiler/codeGen/CgLetNoEscape.lhs b/compiler/codeGen/CgLetNoEscape.lhs
index 9f878dcf60..2fb603baed 100644
--- a/compiler/codeGen/CgLetNoEscape.lhs
+++ b/compiler/codeGen/CgLetNoEscape.lhs
@@ -9,6 +9,13 @@
 %********************************************************
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgLetNoEscape ( cgLetNoEscapeClosure ) where
 
 #include "HsVersions.h"
diff --git a/compiler/codeGen/CgMonad.lhs b/compiler/codeGen/CgMonad.lhs
index f9ddeb959c..1c9cfa7ec1 100644
--- a/compiler/codeGen/CgMonad.lhs
+++ b/compiler/codeGen/CgMonad.lhs
@@ -8,6 +8,13 @@ See the beginning of the top-level @CodeGen@ module, to see how this
 monadic stuff fits into the Big Picture.
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 {-# LANGUAGE BangPatterns #-}
 module CgMonad (
 	Code,	-- type
diff --git a/compiler/codeGen/CgParallel.hs b/compiler/codeGen/CgParallel.hs
index 682f28aad4..2804104708 100644
--- a/compiler/codeGen/CgParallel.hs
+++ b/compiler/codeGen/CgParallel.hs
@@ -8,6 +8,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgParallel(
 	staticGranHdr,staticParHdr,
 	granFetchAndReschedule, granYield,
diff --git a/compiler/codeGen/CgPrimOp.hs b/compiler/codeGen/CgPrimOp.hs
index e8f75b5dfe..23708fe568 100644
--- a/compiler/codeGen/CgPrimOp.hs
+++ b/compiler/codeGen/CgPrimOp.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgPrimOp (
    cgPrimOp
  ) where
diff --git a/compiler/codeGen/CgProf.hs b/compiler/codeGen/CgProf.hs
index b43751361c..23a602c174 100644
--- a/compiler/codeGen/CgProf.hs
+++ b/compiler/codeGen/CgProf.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgProf (
 	mkCCostCentre, mkCCostCentreStack,
 
diff --git a/compiler/codeGen/CgStackery.lhs b/compiler/codeGen/CgStackery.lhs
index e6024e7410..2628760183 100644
--- a/compiler/codeGen/CgStackery.lhs
+++ b/compiler/codeGen/CgStackery.lhs
@@ -8,6 +8,13 @@ Stack-twiddling operations, which are pretty low-down and grimy.
 (This is the module that knows all about stack layouts, etc.)
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgStackery (
 	spRel, getVirtSp, getRealSp, setRealSp,
 	setRealAndVirtualSp, getSpRelOffset,
diff --git a/compiler/codeGen/CgTailCall.lhs b/compiler/codeGen/CgTailCall.lhs
index 994ad105ec..fb8f854c0b 100644
--- a/compiler/codeGen/CgTailCall.lhs
+++ b/compiler/codeGen/CgTailCall.lhs
@@ -5,6 +5,13 @@
 % Code generation for tail calls.
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgTailCall (
 	cgTailCall, performTailCall,
 	performReturn, performPrimReturn,
diff --git a/compiler/codeGen/CgTicky.hs b/compiler/codeGen/CgTicky.hs
index 1e814fe15d..04f38ac8c4 100644
--- a/compiler/codeGen/CgTicky.hs
+++ b/compiler/codeGen/CgTicky.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CgTicky (
 	emitTickyCounter,
 
diff --git a/compiler/codeGen/ClosureInfo.lhs b/compiler/codeGen/ClosureInfo.lhs
index 66eeb34c5f..ac047edb89 100644
--- a/compiler/codeGen/ClosureInfo.lhs
+++ b/compiler/codeGen/ClosureInfo.lhs
@@ -12,6 +12,13 @@ Much of the rationale for these things is in the ``details'' part of
 the STG paper.
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module ClosureInfo (
 	ClosureInfo(..), LambdaFormInfo(..),	-- would be abstract but
 	StandardFormInfo(..),			-- mkCmmInfo looks inside
diff --git a/compiler/codeGen/CodeGen.lhs b/compiler/codeGen/CodeGen.lhs
index 806f654df0..08af9715df 100644
--- a/compiler/codeGen/CodeGen.lhs
+++ b/compiler/codeGen/CodeGen.lhs
@@ -11,6 +11,13 @@ This module says how things get going at the top level.
 functions drive the mangling of top-level bindings.
 
 \begin{code}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module CodeGen ( codeGen ) where
 
 #include "HsVersions.h"
diff --git a/compiler/codeGen/StgCmm.hs b/compiler/codeGen/StgCmm.hs
index 0928645964..7aa159844b 100644
--- a/compiler/codeGen/StgCmm.hs
+++ b/compiler/codeGen/StgCmm.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmm ( codeGen ) where
 
 #define FAST_STRING_NOT_NEEDED
diff --git a/compiler/codeGen/StgCmmBind.hs b/compiler/codeGen/StgCmmBind.hs
index 4f60d0a6cf..9bf57b1cb4 100644
--- a/compiler/codeGen/StgCmmBind.hs
+++ b/compiler/codeGen/StgCmmBind.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmBind (
 	cgTopRhsClosure,
 	cgBind,
diff --git a/compiler/codeGen/StgCmmClosure.hs b/compiler/codeGen/StgCmmClosure.hs
index ede24a5c6f..5c0741a65e 100644
--- a/compiler/codeGen/StgCmmClosure.hs
+++ b/compiler/codeGen/StgCmmClosure.hs
@@ -10,6 +10,13 @@
 -----------------------------------------------------------------------------
 
 {-# LANGUAGE RecordWildCards #-}
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmClosure (
         DynTag,  tagForCon, isSmallFamily,
 	ConTagZ, dataConTagZ,
diff --git a/compiler/codeGen/StgCmmEnv.hs b/compiler/codeGen/StgCmmEnv.hs
index 4542922675..d8a7061eec 100644
--- a/compiler/codeGen/StgCmmEnv.hs
+++ b/compiler/codeGen/StgCmmEnv.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmEnv (
 	CgIdInfo,
 
diff --git a/compiler/codeGen/StgCmmExpr.hs b/compiler/codeGen/StgCmmExpr.hs
index bc4e9df44f..5ea935984d 100644
--- a/compiler/codeGen/StgCmmExpr.hs
+++ b/compiler/codeGen/StgCmmExpr.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmExpr ( cgExpr ) where
 
 #define FAST_STRING_NOT_NEEDED
diff --git a/compiler/codeGen/StgCmmForeign.hs b/compiler/codeGen/StgCmmForeign.hs
index 54a0214bcb..f07fd6c6bc 100644
--- a/compiler/codeGen/StgCmmForeign.hs
+++ b/compiler/codeGen/StgCmmForeign.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmForeign (
   cgForeignCall, loadThreadState, saveThreadState,
   emitPrimCall, emitCCall,
diff --git a/compiler/codeGen/StgCmmGran.hs b/compiler/codeGen/StgCmmGran.hs
index b6a1ae66bb..232c7c6b58 100644
--- a/compiler/codeGen/StgCmmGran.hs
+++ b/compiler/codeGen/StgCmmGran.hs
@@ -8,6 +8,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmGran (
 	staticGranHdr,staticParHdr,
 	granThunk, granYield,
diff --git a/compiler/codeGen/StgCmmLayout.hs b/compiler/codeGen/StgCmmLayout.hs
index f8137dc564..9afcd029a4 100644
--- a/compiler/codeGen/StgCmmLayout.hs
+++ b/compiler/codeGen/StgCmmLayout.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmLayout (
 	mkArgDescr, 
 	emitCall, emitReturn,
diff --git a/compiler/codeGen/StgCmmMonad.hs b/compiler/codeGen/StgCmmMonad.hs
index 7263f751c3..cab0897fe8 100644
--- a/compiler/codeGen/StgCmmMonad.hs
+++ b/compiler/codeGen/StgCmmMonad.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmMonad (
 	FCode,	-- type
 
diff --git a/compiler/codeGen/StgCmmPrim.hs b/compiler/codeGen/StgCmmPrim.hs
index 4ce830a4ee..8935d56537 100644
--- a/compiler/codeGen/StgCmmPrim.hs
+++ b/compiler/codeGen/StgCmmPrim.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmPrim (
    cgOpApp
  ) where
diff --git a/compiler/codeGen/StgCmmProf.hs b/compiler/codeGen/StgCmmProf.hs
index 17b61c6a59..338e10428b 100644
--- a/compiler/codeGen/StgCmmProf.hs
+++ b/compiler/codeGen/StgCmmProf.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmProf (
 	initCostCentres, ccType, ccsType,
 	mkCCostCentre, mkCCostCentreStack,
diff --git a/compiler/codeGen/StgCmmTicky.hs b/compiler/codeGen/StgCmmTicky.hs
index 88ff1389dd..8b8ab34989 100644
--- a/compiler/codeGen/StgCmmTicky.hs
+++ b/compiler/codeGen/StgCmmTicky.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmTicky (
 	emitTickyCounter,
 
diff --git a/compiler/codeGen/StgCmmUtils.hs b/compiler/codeGen/StgCmmUtils.hs
index ddb87e4ffe..ca0d23a3ac 100644
--- a/compiler/codeGen/StgCmmUtils.hs
+++ b/compiler/codeGen/StgCmmUtils.hs
@@ -6,6 +6,13 @@
 --
 -----------------------------------------------------------------------------
 
+{-# OPTIONS -fno-warn-tabs #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and
+-- detab the module (please do the detabbing in a separate patch). See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#TabsvsSpaces
+-- for details
+
 module StgCmmUtils (
 	cgLit, mkSimpleLit,
 	emitDataLits, mkDataLits,