Explicitly enable the use of init/fini array under PNaCl

newlib/libc/misc/init.c

 /*
  * Copyright (C) 2004 CodeSourcery, LLC
  *
  * Permission to use, copy, modify, and distribute this file
  * for any purpose is hereby granted without fee, provided that
  * the above copyright notice and this notice appears in all
  * copies.
  *
  * This file is distributed WITHOUT ANY WARRANTY; without even the implied
  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  */
 
 /* Handle ELF .{pre_init,init,fini}_array sections.  */
 #include <sys/types.h>
 
-#ifdef HAVE_INITFINI_ARRAY
+#if defined(HAVE_INITFINI_ARRAY) || defined(__pnacl__)
 
 /* These magic symbols are provided by the linker.  */
 extern void (*__preinit_array_start []) (void) __attribute__((weak));
 extern void (*__preinit_array_end []) (void) __attribute__((weak));
 extern void (*__init_array_start []) (void) __attribute__((weak));
 extern void (*__init_array_end []) (void) __attribute__((weak));
 
 extern void _init (void);
 
 /* Iterate over all the init routines.  */
 void
 __libc_init_array (void)
 {
   size_t count;
   size_t i;
 
   count = __preinit_array_end - __preinit_array_start;
   for (i = 0; i < count; i++)
     __preinit_array_start[i] ();
 
   _init ();
 
   count = __init_array_end - __init_array_start;
   for (i = 0; i < count; i++)
     __init_array_start[i] ();
 }
 #endif