gcc -I option flag

gcc -I adds include directory of header files.

Syntax

$ gcc -Idir [options] [source files] [object files] [-o output file]

Example

proj/src/myheader.h:

// myfile.h
#define NUM1 5

 

myfile.c:

// myfile.c
#include <stdio.h>
#include "myheader.h"
 
void main()
{
    int num = NUM1;
    printf("num=%d\n", num);
}

 

Build myfile.c without include directory proj/src :

$ gcc myfile.c -o myfile
myfile.c:2:22: fatal error: myheader.h: No such file or directory
compilation terminated.
$

 

Build myfile.c with include directory proj/src :

$ gcc -Iproj/src myfile.c -o myfile
$ ./myfile
num=5
$

 


See also

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