[Mac OS X] a patch for binary compatibility issue.

[Nozomu Ando]

Hello all,

The binary of current emacs on Mac OS X depends on internal
implementation of system library.  On Mac OS X 10.3, we cannot invoke
emacs which is unexec'ed on Mac OS X 10.2.8, because
malloc_default_zone()->size returns incorrect value
(in unexec_realloc()).

The attached patch solves this problem. Moreover, emacs compiled
on Mac OS X 10.3 works for me on Mac OS X 10.4.

It assumes that return value of malloc() is multiple of 16 and
assumes that emacs requires only it is multiple of 8 (even when
USE_LSB_TAG).

It also changes ptr_in_unexec_regions() for efficiency.

---
2005-05-08  Nozomu Ando  <address@hidden>

        * unexmacosx.c: Include assert.h.
        (MACOSX_MALLOC_MULT16): Define to 1 if not already defined.
        (unexec_malloc_header_t): Add typedef.
        (ptr_in_unexec_regions): Define if MACOSX_MALLOC_MULT16.
        (unexec_malloc): Add assert. Malloc with struct
        unexec_malloc_header and record size on it if !in_dumped_exec.
        (unexec_realloc): Add assert. Use recorded size if in_dumped_exec
        && old_ptr is malloc'ed before unexec. Record new_size if
        !in_dumped_exec.
        (unexec_free): Free with struct unexec_malloc_header.
---

Best Regards,
Nozomu Ando
---

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