Fix and supress some warnings, and turn on -Werror when validating

rts/Makefile

@@ -171,6 +171,16 @@ RtsUtils_CC_OPTS += -DTargetPlatform=$(DQ)$(TARGETPLATFORM)$(DQ)
 RtsUtils_CC_OPTS += -DGhcUnregisterised=$(DQ)$(GhcUnregisterised)$(DQ)
 RtsUtils_CC_OPTS += -DGhcEnableTablesNextToCode=$(DQ)$(GhcEnableTablesNextToCode)$(DQ)
 
+StgCRun_CC_OPTS += -w
+Typeable_CC_OPTS += -w
+RetainerProfile_CC_OPTS += -w
+sm/Compact_CC_OPTS += -w
+# The above warning supression flags are a temporary kludge.
+# While working on this module you are encouraged to remove it and fix
+# any warnings in the module. See
+#     http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions#Warnings
+# for details
+
 ifeq "$(way)" "mp"
 SRC_HC_OPTS += -I$$PVM_ROOT/include
 endif

rts/Schedule.c

@@ -2577,7 +2577,12 @@ initScheduler(void)
 }
 
 void
-exitScheduler( rtsBool wait_foreign )
+exitScheduler(
+    rtsBool wait_foreign
+#if !defined(THREADED_RTS)
+                         __attribute__((unused))
+#endif
+)
                /* see Capability.c, shutdownCapability() */
 {
     Task *task = NULL;

utils/genapply/GenApply.hs

 {-# OPTIONS -cpp -fglasgow-exts #-}
+{-# OPTIONS_GHC -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions#Warnings
+-- for details
 module Main(main) where
 
 #include "../../includes/ghcconfig.h"

utils/genprimopcode/Parser.y

 
 {
+{-# OPTIONS_GHC -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions#Warnings
+-- for details
+
 module Parser (parse) where
 
 import Lexer (lex_tok)

utils/hpc/HpcParser.y

 { 
+{-# OPTIONS_GHC -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/WorkingConventions#Warnings
+-- for details
+
 module HpcParser where
 
 import HpcLexer

validate

@@ -11,9 +11,11 @@ if [ -f mk/build.mk ]; then
 fi
 
 # The default is a "quick" build
-echo BuildFlavour=quick >  mk/build.mk
-echo HADDOCK_DOCS=YES   >> mk/build.mk
-cat mk/build.mk.sample  >> mk/build.mk
+echo "BuildFlavour = quick"   >  mk/build.mk
+echo "HADDOCK_DOCS = YES"     >> mk/build.mk
+cat mk/build.mk.sample        >> mk/build.mk
+echo "SRC_HC_OPTS += -Werror" >> mk/build.mk
+echo "SRC_CC_OPTS += -Werror" >> mk/build.mk
 
 # You can override the default validate settings using mk/validate.mk
 # e.g. you could add GhcLibWays=p to test profiling.