CODEWITHSUNDEEP
ccompilationheader
Rémy.W
Rémy.W

Reputation: 225

C macro undeclared

I'm trying to use a header to declare some Macros for the pre-processor and use them in the code file.

That's my header : error.h

#ifndef PROJET_MODULE_H 
#define PROJET_MODULE_H

#define TESTMACRO 5

#endif

and the code file : error.c

#include <error.h>
#include <stdio.h>

int main(){
   printf("%d\n", TESTMACRO);
   return 0;
}

And I get this error :

‘TESTMACRO’ undeclared (first use in this function)

I've tried to compile doing :

gcc error.c -o error

and

gcc error.h error.c -o error

Both gave me the error.. Any help appreciated, thanks

Upvotes: 0

Views: 634

Answers (2)

Mohit Jain
Mohit Jain

Reputation: 280

To include System header file you can use <> or ""

To include Custom header file you should use "error.h" or "absolute path of error.h"

If you still want to include you custom header file using <> you should compile using following command.

gcc error.c -I <path of folder in which error.h resides> -o error

e.g if error.h is in /user/testuser/include/error.h then

gcc error.c -I /user/testuser/include/ -o error

Upvotes: 1

cocool97
cocool97

Reputation: 1251

To sum up everything said in comment :
To include non-system headers, you have to use " and not <>
The resquest was solved changing #include <error.h> to #include "error.h"

Upvotes: 1

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