Function in gcc source code -

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can 1 tell me function in gcc source code responsible finding macro in c file , repalce actual value ?

i want know function have take log making changes it, @ end log file contain macro used , line number .

it's done preprocessor, prior generating output file. if want see doing, try gcc -e

from man gcc:

-e  stop after preprocessing stage; not run compiler proper.     output in form of preprocessed source code, sent     standard output.

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