//参考 u-boot-1.1.4/config.mk
cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
> /dev/null 2>&1; then echo "$(1)";else echo "$(2)";fi;)
//参考u-boot-1.1.4/cpu/arm920t/config.mk
PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
//call函数参考GnuMakeMenual 8.6
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