[yocto] Add new compiler macro

[luciosantinell at libero.it]

Hi, i wanted to add a compiler macro (NEW_MACRO) in order to compile all the code hidden beetween
#ifdef NEW_MACRO

#endif
in all my recipes. I think that the right place to do that is in bitbake.conf file present under poky/meta/conf but when i try to do: 

TARGET_CPPFLAGS += "-MMC_WRITE"

I get the error :
configure: error: cannot compute suffix of object files: cannot compile

How can i send the macro to the compiler in the correct way?

Thanks

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