Message-Id: <3.0.16.19971017112420.2b47a9b4@hem1.passagen.se>
Date: Fri, 17 Oct 1997 11:24:23 -0400
To: darn AT merlin DOT imag DOT net
From: Peter Palotas <blizzar AT hem1 DOT passagen DOT se>
Subject: Re: CPP question.
Cc: djgpp AT delorie DOT com
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Precedence: bulk

At 22.27 1997-10-16 -0700, you wrote:
>Peter Palotas wrote:
>> 
>> Is there some way to make CPP (the macro preprocessor) not include files
>> from included files? i.e. if there's a line #include "file1.h" in the file
>
>
>Oh my.  That's a bit hard to decypher.  Do you mean something like this:

Okay... Let's get this straight then... If I have a file:

-------------- file.c -----------------
#ifndef __MY_HEADER__
#define __MY_HEADER__
#include <stdio.h>
#include <stdlib.h>

#ifdef _INCLUDE_MY_DOS_H_
#include "mydos.h"
#endif

#include "file.h"

int main(void)
{
        return 0;
};

-------------- mydos.h ----------------
#include <stdlib.h>
#include "file2.h"

void my_func(void);


-------------- file.h -----------------
#include <string.h>

int my_func_again(void);
int this_was_no_fun_writing(void);

------------- file2.h -----------------
/* This is file2.h I'm really too lazy  */
/* to write any code here, so this will */
/* have to be sufficient!               */


Okay... Now what I would prefer the output to be (if _INCLUDE_MYDOS_H_  was
defined) would be the following:

------------- desired output ----------

#ifndef __MY_HEADER__
#define __MY_HEADER__
#include <stdio.h>
#include <stdlib.h>

#ifdef _INCLUDE_MY_DOS_H_

#include <stdlib.h>
/* This is file2.h I'm really too lazy  */
/* to write any code here, so this will */
/* have to be sufficient!               */

void my_func(void);
#endif

#include <string.h>

int my_func_again(void);
int this_was_no_fun_writing(void);


int main(void)
{
        return 0;
};

And I actually managed to solve this problem too, in a somewhat ugly way
maybe, by writing an AWK program (actually two of them) that took care of
the includes (it is called recursively, so I guess it uses a lot of
memory), and then calling CPP which would only do what I wanted it to do
since all the other #defines and stuff were commented out by the first AWK
program, and the second AWK program would only uncomment all these
#preprocessor-statements.

-- Peter Palotas alias Blizzar -- blizzar AT hem1 DOT passagen DOT se --

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* A brief description of DJGPP:                     *
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