Path specification when including header file in C language

Here's what I'm doing when including header files across multiple directories in C / C ++.

root
|-dir1
   |-main1.c
|-dir2
   |-main2.c
|-dir3
   |- config.h

Now if you want to include config.h in both main1.c and main2.c, in two files

#include "../dir3/config.h"

I think I will write

../dir3/

Is a little annoying to write.

Therefore, create the following header file.

config_sub.h

#include "../dir3/config.h"

Then place it as follows.

root
|-dir1
   |-main1.c
   |-config_sub.h
|-dir2
   |-main2.c
   |-config_sub.h
|-dir3
   |- config.h

By doing this, in main1.c and main2.c

#include "config_sub.h"

By doing config.h You can include the contents of.

If you don't want to create the file manually, you may be able to handle it by writing a script in Python ...