Re: -fzero-initialized-in-bss

["Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>]

(Sorry my first attempt bounced....)


 > We're having some obscure failures with code containing things like
 > 
 > static struct something *ptr = 0;
 > 
 > The variable ptr is placed in .bss (.sbss with -Os) and allocated via
 > .zero. Running the program under gdb shows the value as -1. If I
 > recompile with -fno-zero-initialized-in-bss, it goes to .data, the
 > value appears as 0, and the program runs as expected.

Can you create a reduced testcase which demonstrates the problem?
http://gcc.gnu.org/bugs.html#report

E.g. what do you get when you compile and run the following program?

	extern int printf (const char *, ...);
	extern void abort(void);
	
	int main(void)
	{
	  static struct something *ptr1, *ptr2 = 0;
	
	  printf ("%p %p\n", ptr1, ptr2);
	  if (ptr1 != ptr2)
	    abort();
	  return 0;
	}

It should output "0 0".

		Thanks,
		--Kaveh
--
Kaveh R. Ghazi			ghazi@caip.rutgers.edu