[yocto] [linux-yocto-3.2][PATCH] arm: Fix linking errors with binutils 2.23

[Khem Raj]

We end up with linking errors on arm using latest binutils
because we are linking asm generated objects which use -march=all
generating different attributes into object and use some c objects
e.g. misc.o which use different march therefore generating a
different set of attributes into object. When linking is done
the ld complains since it finds incompatible attributes and ends
up with errors like

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

This patch fixes it by providing correct march to assembly routines
which than matches with output of ld.

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 arch/arm/boot/compressed/Makefile |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 21f56ff..05d9cb3 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -5,7 +5,7 @@
 #
 
 OBJS		=
-
+plus_sec :=	$(call as-instr,.arch_extension sec,+sec)
 # Ensure that MMCIF loader code appears early in the image
 # to minimise that number of bocks that have to be read in
 # order to load it.
@@ -123,7 +123,7 @@ KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
 endif
 
 ccflags-y := -fpic -fno-builtin -I$(obj)
-asflags-y := -Wa,-march=all
+asflags-y := -Wa,-march=armv7-a$(plus_sec)
 
 # Supply kernel BSS size to the decompressor via a linker symbol.
 KBSS_SZ = $(shell size $(obj)/../../../../vmlinux | awk 'END{print $$3}')
-- 
1.7.9.5