CODEWITHSUNDEEP
cincludeheader-files
extremeaxe5
extremeaxe5

Reputation: 815

Easiest way to determine which file is included in C?

For instance, in 

#include <stdio.h>

what's the easiest way to figure out the path to the included file?

Edit: I'm using gcc 9.2.0 on Arch Linux.

Upvotes: 0

Views: 389

Answers (2)

0___________
0___________

Reputation: 67476

You need to find where gcc is searching for the include files.

Try

echo | gcc -E -Wp,-v -

on my computer (Ubuntu on windows 10) it shows

piotr@DESKTOP-6R1GELF:~$ echo | gcc -E -Wp,-v -
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/7/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command-line>"
# 31 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 32 "<command-line>" 2
# 1 "<stdin>"

Upvotes: 2

Cosinus
Cosinus

Reputation: 659

I do usually generate dependencies in my Makefile with the following command line:

gcc main.c -o main -MD

The -MD flag generates a dependency file, where all included headers are listed.

Upvotes: 3

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