[question] pass CONFIG_FOO to CC problem

Hello,

I was expecting kbuild passes CONFIG_FOO from .config to CC
-DCONFIG_FOO, but it doesn't.  So I have to add

ifdef CONFIG_FOO
EXTRA_CFLAGS += -DCONFIG_FOO
endif

Is that the right way? thanks in advance.

-- 
Coywolf Qi Hunt
http://ahbl.org/~coywolf/
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