[patch] Implement __cxa_atexit

[Paul Brook]

The attached patch implements __cxa_atexit and __cxa_finalize.

As the name suggests these are used by C++ code to register static object 
destructors. They are documented in section 3.3.5 of the C++ ABI 
(http://www.codesourcery.com/cxx-abi/abi.html)

Despite this they are generally provided by the C library, not the C++ runtime 
library.

I basically took the exitsing atexit/on_exit implementation, broke it out into 
separate files, and added the extra _dso_handle field. I also modified the 
_REENT_SMALL case to allow more than 32 handlers to be registered.

Tested with cross to arm-none-elf.
Ok?

Paul

2004-09-03  Paul Brook  <paul@codesourcery.com>

 * libc/include/sys/reent.h (struct _on_exit_args): Add _dso_handle
 and _is_cxa.
 (struct _atexit): Add _next when _REENT_SMALL.
 (struct _reent): Add _atexit0 when _REENT_SMALL.
 (_REENT_INIT_PTR): Adjust.
 * libc/stdlib/Makefile.am (GENERAL_SOURCES): Add __atexit.c and
 __call_exit.c.
 (EXTENDED_SOURCES): Add cxa_atexit.c and cxa_finalize.c.
 * libc/stdlib/Makefile.in: Regenerate.
 * libc/stdlib/__atexit.c: New file.
 * libc/stdlib/__call_atexit.c: New file.
 * libc/stdlib/atexit.h: Remove old definitions.  Add new.
 * libc/stdlib/atexit.c (atexit): Use __register_exitproc.
 * libc/stdlib/cxa_atexit.c: New file.
 * libc/stdlib/cxa_finalize.c: New file.
 * libc/stdlib/exit.c (exit): Use __call_exitprocs.
 * libc/stdlib/on_exit.c (on_exit): Use __register_exitproc.
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