[Bug target/46770] Replace .ctors/.dtors with .init_array/.fini_array on targets supporting them

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46770

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-07 16:45:11 
UTC ---
(In reply to comment #2)
> Hmm, is it possible to do the change without breaking ABI (i.e. preserving the
> proper relative order for binary built with init_arra/fini_array linked with
> ctors/dtors library and vice versa?
> Honza

[...@gnu-6 46770]$ cat foo.c
#include <stdio.h>

static void
init ()
{
  printf ("init_array\n");
}

static void (*const init_array []) ()
  __attribute__ ((section (".init_array"), aligned (sizeof (void *))))
  = { init };

static void
fini ()
{
  printf ("fini_array\n");
}

static void (*const fini_array []) ()
  __attribute__ ((section (".fini_array"), aligned (sizeof (void *))))
  = { fini };

static void
ctor ()
{
  printf ("ctor\n");
}

static void (*const ctors []) ()
  __attribute__ ((section (".ctors"), aligned (sizeof (void *))))
  = { ctor };

static void
dtor ()
{
  printf ("dtor\n");
}

static void (*const dtors []) ()
  __attribute__ ((section (".dtors"), aligned (sizeof (void *))))
  = { dtor };

int
main ()
{
  printf ("main\n");
}
[...@gnu-6 46770]$ gcc foo.c
[...@gnu-6 46770]$ ./a.out 
ctor
init_array
main
fini_array
dtor
[...@gnu-6 46770]$