OMAP4: enable smc instruction in new assembler versions

New assemblers need -march=armv7-a+sec on command line or
.arch_extension sec inline to enable use of the smc instruction.

This patch uses as-instr to check the latter to conditionally
enable the former in AFLAGS for files that use smc.

Checked on both old and new binutils to verify that it does
not break old versions.

Signed-off-by: John Rigby <john.rigby@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 25bc9453700dd0339e1e66821c60e33c8cc198ea..b86b0629238896bc3d18cbd9b04df42072594f0c 100644 (file)
--- 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