[PATCH] Fix libbacktrace on 32-bit sparc

[David Miller]

From: Ian Lance Taylor <iant@google.com>
Date: Sat, 27 Oct 2012 21:06:59 -0700

> The struct used  by add_function_range is
> 
> struct function_addrs
> {
>   uint64_t low;
>   uint64_t high;
>   struct function *function;
> };
> 
> So on a 32-bit system, this should have a size of 20 if uint64_t
> requires 4-byte alignment, but it should have a size of 24 if uint64_t
> requires 8-byte alignment.  It sounds like uint64_t requires 8-byte
> alignment, so the size of this struct should be 24, so your patch
> shouldn't change matters.  Since your patch presumably works, it
> sounds like sizeof (struct function_addrs) is returning 20, but that
> does not make sense.  It would mean that allocating an array of struct
> function_addrs wouldn't work correctly.
> 
> So I don't know what is going on.

The size is 24, and my patch definitely makes the crashes go away.

It seems like a vector is being used for a mixed set of objects.
I'll try to figure out how that is happening.