gcc Pre-processor information

[ankit7777]

Hi Ian , you have helped to narrow my search but still finding it . . .

Ian Lance Taylor-3 wrote:
> 
> ankit7777 <baid4758@gmail.com> writes:
> 
>> 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?
> 
> Look at the implementation of -dD and the implementation of -g3.  gcc
> does have this information, though it may not be in a particularly
> convenient form.
> 
> Ian
> 
> 

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