The following is compatible with old and new binutils:

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 60e51bc..ee9ef4f 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -26,8 +26,9 @@ obj-$(CONFIG_LOCAL_TIMERS)            += timer-mpu.o
 obj-$(CONFIG_HOTPLUG_CPU)              += omap-hotplug.o
 obj-$(CONFIG_ARCH_OMAP4)               += omap44xx-smc.o omap4-common.o
 
-AFLAGS_omap-headsmp.o                  :=-Wa,-march=armv7-a
-AFLAGS_omap44xx-smc.o                  :=-Wa,-march=armv7-a
+plus_sec := $(call as-instr,.arch_extension sec,+sec)
+AFLAGS_omap-headsmp.o                  :=-Wa,-march=armv7-a$(plus_sec)
+AFLAGS_omap44xx-smc.o                  :=-Wa,-march=armv7-a$(plus_sec)
 
 # Functions loaded to SRAM
 obj-$(CONFIG_ARCH_OMAP2420)            += sram242x.o

-- 
natty gcc-4.5 kernel (2.6.37-rc1) build failure
https://bugs.launchpad.net/bugs/669912
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