[ALPHA] Turn on -Werror in alpha subdirectories.

arch/alpha/kernel/Makefile

@@ -3,8 +3,8 @@
 #
 
 EXTRA_TARGETS	:= head.o
-
 EXTRA_AFLAGS	:= $(CFLAGS)
+CFLAGS		+= -Werror -Wno-sign-compare
 
 obj-y    := entry.o traps.o process.o init_task.o osf_sys.o irq.o \
 	    irq_alpha.o signal.o setup.o ptrace.o time.o semaphore.o \

arch/alpha/lib/Makefile

@@ -3,6 +3,8 @@
 #
 
 EXTRA_AFLAGS := $(CFLAGS)
+CFLAGS += -Werror
+
 L_TARGET := lib.a
 
 # Many of these routines have implementations tuned for ev6.

arch/alpha/mm/Makefile

@@ -2,6 +2,8 @@
 # Makefile for the linux alpha-specific parts of the memory manager.
 #
 
+CFLAGS	+= -Werror
+
 obj-y	:= init.o fault.o extable.o remap.o
 
 obj-$(CONFIG_DISCONTIGMEM) += numa.o

arch/alpha/oprofile/Makefile

+CFLAGS	+= -Werror -Wno-sign-compare
+
 obj-$(CONFIG_OPROFILE) += oprofile.o
 
 DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \