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macro expansion

My CCS version is CCS 5.1.

After I use the "#define" keyword to define a MACRO at the beginning of a certain C file, the macro expansion value appears below it automatically when the cursor put on.

But if I define the MACROs in a certain header file which included at the beginning of the C file, some MACROs expansion value appears automatically but some other not. None build error about these MACROs occur.

Why and how can I make all macro expansions appear?

Tks.