How to tell where a header file is included from?

c++ c gcc include g++
harschware picture harschware · Apr 29, 2011 · Viewed 51.9k times · Source

How can I tell where g++ was able to find an include file? Basically if I

#include <foo.h>

g++ will scan the search path, using any include options to add or alter the path. But, at the end of days, is there a way I can tell the absolute path of foo.h that g++ chose to compile? Especially relevant if there is more than one foo.h in the myriad of search paths.

Short of a way of accomplishing that... is there a way to get g++ to tell me what its final search path is after including defaults and all include options?

Answer

Bulletmagnet picture Bulletmagnet · Sep 3, 2013 
g++ -H ...

will also print the full path of include files in a format which shows which header includes which

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