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From: "Steve Baldwin" <stbaldwin AT multiservice DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: Accessing global variables causes segfault - SOLVED
Date: Sat, 22 Feb 2003 18:02:49 +1100
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OK, I think I've solved this by creating export/import libraries.
Thanks

-----Original Message-----
From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On Behalf
Of Steve Baldwin
Sent: Saturday, 22 February 2003 4:22 PM
To: cygwin AT cygwin DOT com
Subject: Accessing global variables causes segfault


I'm having some (further) issues porting some Unix code to cygwin.  I
have a scenario where there are global variables defined in a shared
library, and referenced in the executable.  See the example below.  Yes
I know it's bad coding practice, but I'm hoping to port the code with
the least amount of re-writing as possible.  It works fine under Unix,
but as you can see from below, doesn't play well under cygwin.  Is there
anything I can do - apart from the obvious re-write.

Cheers,

Steve

[cdev]$ cat a.c
#include <stdio.h>
#include <stdlib.h>
extern void fx (void) ;
extern int myglobal ;

int
main (int argc, char **argv) {
        myglobal = 99 ;
        fx () ;
}
[cdev]$ cat b.c
#include <stdio.h>

int             *myglobal ;

void
fx (void)
{
        printf("here i am : myglobal = %d\n", myglobal) ;
}
[cdev]$ gcc b.c -o libb.dll -shared
[cdev]$ gcc a.c -o a -L. -lb
[cdev]$ a
Segmentation fault (core dumped)


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