gcc Pre-Processing Information

[ankit7777]

Problem Statement : Given a C file which has several macros defined (eg.
#define MACRO 10) . I need to know what all macros are defined and their
usage point(eg. line number) in the code.

Need to know this information during or after gcc pre-processing phase.

Possible solution may dump this macro information in some file.

Is there any way that gcc can dump this information and if yes how?
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