GCC including header files in windows

Question

I have my project in a directory called junkyard. Inside junkyard, I have test.c, and a folder called include.

My code looks like this:

#include <my_global.h>
#include <mysql.h>

int main(int argc, char **argv)
{
  printf("MySQL client version: %s\n", mysql_get_client_info());
}

And the two header files are located inside the include folder (which, again, is in the root directory of the project. So the structure's necessary files are located like this:

junkyard/test.c

junkyard/include/mysql.h

junkyard/include/my_global.h

Note that I am using GCC on Windows. I am unable to compile the program, and I have tried several approaches. How do I link the header files correctly? Thanks.

You don't link the header files, linkage is 4 compilation stages later. However, adding `-Iinclude` to the compiler flags may solve this. — , Oct 13 '12 at 20:04
@Zeta `gcc -I/include test.c` That's one of the ones I tried. — capcom, Oct 13 '12 at 20:05
@capcom And that's bad. You don't need the slash. Only `gcc -Iinclude test.c` — , Oct 13 '12 at 20:06
@Zeta Perfect, thanks. I'm still a little new to this. In which case do I use `-I/pathname`? — capcom, Oct 13 '12 at 20:10

score 5 · Accepted Answer · edited May 23 '17 at 10:32

5

First of all difference between #include syntax:

#include <> means to include file from "compiler directory" (which can be set by preprocessor option -I)
#include "" means to include file from "local directory"

If you want to include file from your project you probably should use:

#include "include/mysql.h"
#include "include/my_global.h"

If you (for some reasons) want to still use #include <> use gcc like this:

gcc -Iinclude test.c

edited May 23 '17 at 10:32

Community

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answered Oct 13 '12 at 20:10

Vyktor

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Would `-Iinclude` be `-Iheaders` if, say, the headers were located in a folder called headers instead of include? – capcom Oct 13 '12 at 20:11
@capcom yes they would, I've added a link which describes it in gcc "Manual" – Vyktor Oct 13 '12 at 20:12

GCC including header files in windows

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