Re: -fzero-initialized-in-bss

[Paul Koning <pkoning at equallogic dot com>]

>>>>> "Michael" == Michael LeBlanc <leblanc@skycomputers.com> writes:

 Michael> We're having some obscure failures with code containing
 Michael> things like static struct something *ptr = 0;

 Michael> The variable ptr is placed in .bss (.sbss with -Os) and
 Michael> allocated via .zero.  Running the program under gdb shows
 Michael> the value as -1.  If I recompile with
 Michael> -fno-zero-initialized-in-bss, it goes to .data, the value
 Michael> appears as 0, and the program runs as expected.

But .bss is supposed to be zero.  If not, I'd look for a bug in the OS
(program loader).  It doesn't sound like something under control of
the compiler -- the compiler is just assuming that .bss means what
it's supposed to mean.

     paul