According with this discussion [1] the new assemblers need -march=armv7-a+sec on command line or .arch_extension sec inline to enable use of the smc instruction.
In the sakoman's u-boot repository there is branch for the omap4 [2] which uses the smc instruction with the -march=armv7-a, and it will not compile with the latest binutils (2.21)
This patch fix that problem adding conditionally the armv7-a+sec the march. In order to do this the patch adds as-instr which checks the latter to enable the correct -march in AFLAGS for files that use smc.
This patch must be applied on top of git://www.sakoman.com/git/u-boot.git;branch=omap4-exp
1. https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/669912 2. http://www.sakoman.com/cgi-bin/gitweb.cgi?p=u-boot.git;a=shortlog;h=refs/hea...
Signed-off-by: Víctor Manuel Jáquez Leal vjaquez@igalia.com --- arch/arm/cpu/armv7/omap4/Makefile | 2 ++ config.mk | 9 +++++++++ 2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap4/Makefile b/arch/arm/cpu/armv7/omap4/Makefile index 987dc9d..9dc2b64 100644 --- a/arch/arm/cpu/armv7/omap4/Makefile +++ b/arch/arm/cpu/armv7/omap4/Makefile @@ -26,6 +26,8 @@ include $(TOPDIR)/config.mk LIB = $(obj)lib$(SOC).o
SOBJS += lowlevel_init.o +plus_sec := $(call as-instr,.arch_extension sec,+sec) +lowlevel_init.o: AFLAGS += -Wa,-march=armv7-a$(plus_sec)
COBJS += board.o COBJS += mem.o diff --git a/config.mk b/config.mk index c6d6f7b..8d86860 100644 --- a/config.mk +++ b/config.mk @@ -266,3 +266,12 @@ cmd_link_o_target = $(if $(strip $1),\ rm -f $@; $(AR) rcs $@ )
######################################################################### + +# Tries to compile an assembly instruction +as-instr = $(shell if echo -e "$(1)" | \ + $(CC) $(AFLAGS) -c -xassembler - \ + -o $(TMPOUT)astest$$$$.out > /dev/null 2>&1; \ + then rm $(TMPOUT)astest$$$$.out; echo "$(2)"; \ + else echo "$(3)"; fi) + +#########################################################################