On 32-bit architectures with _FILE_OFFSET_BITS=64,
sizeof(off_t) > sizeof(size_t) .
LOG_HEADER_SZ was #define'd as an expression of type size_t, so in order
to get the sign extension right we need -(off_t)LOG_HEADER_SZ instead of
(off_t)(-LOG_HEADER_SZ). However, we can just define the *_SZ macros to
cast to off_t, then we don't need to worry about negation.
Fixes Debian bug #822749, PR 175.
Signed-off-by (and updated by): Nicolas Williams <nico@twosigma.com>
7c8b66d76b