fix build errors using gcc-4.7

Error: selected processor does not support ARM mode `smc #0'
error: DIV usage mismatch between arch/arm/boot/compressed/head.o and output
error: DIV usage mismatch between arch/arm/boot/compressed/misc.o and output
error: DIV usage mismatch between arch/arm/boot/compressed/decompress.o and output
error: DIV usage mismatch between arch/arm/boot/compressed/lib1funcs.o and output
error: DIV usage mismatch between arch/arm/boot/compressed/ashldi3.o and output

Change-Id: I1251b843bb9b4c74ba8039fd194e3aed2183cf5b

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

arch/arm/boot/compressed/Makefile

@@ -4,9 +4,19 @@
 # create a compressed vmlinuz image from the original vmlinux
 #
 
-AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
-HEAD	= head.o
-OBJS	= misc.o decompress.o
+plus_sec := $(call as-instr,.arch_extension sec,+sec)
+
+
+AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
+AFLAGS_head.o += -Wa,-march=armv7-a$(plus_sec)
+HEAD = head.o
+
+AFLAGS_misc.o +=-Wa,-march=armv7-a$(plus_sec)
+MISC = misc.o
+
+AFLAGS_decompress.o += -Wa,-march=armv7-a$(plus_sec)
+DECOMPRESS = decompress.o
+
 FONTC	= $(srctree)/drivers/video/console/font_acorn_8x8.c
 
 #
@@ -66,7 +76,7 @@ suffix_$(CONFIG_KERNEL_LZMA) = lzma
 
 targets       := vmlinux vmlinux.lds \
 		 piggy.$(suffix_y) piggy.$(suffix_y).o \
-		 font.o font.c head.o misc.o $(OBJS)
+		 font.o font.c head.o misc.o decompress.o $(OBJS)
 
 # Make sure files are removed during clean
 extra-y       += piggy.gzip piggy.lzo piggy.lzma lib1funcs.S
@@ -96,19 +106,21 @@ LDFLAGS_vmlinux += -X
 LDFLAGS_vmlinux += -T
 
 # For __aeabi_uidivmod
+AFLAGS_lib1funcs.o +=-Wa,-march=armv7-a$(plus_sec)
 lib1funcs = $(obj)/lib1funcs.o
 
 $(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S FORCE
 	$(call cmd,shipped)
 
-$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
+$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/$(MISC) $(obj)/$(DECOMPRESS) $(obj)/piggy.$(suffix_y).o \
 	 	$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) FORCE
 	$(call if_changed,ld)
 	@:
 
 $(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
 	$(call if_changed,$(suffix_y))
 
+AFLAGS_piggy.$(suffix_y).o += -Wa,-march=armv7-a$(plus_sec)
 $(obj)/piggy.$(suffix_y).o:  $(obj)/piggy.$(suffix_y) FORCE
 
 CFLAGS_font.o := -Dstatic=