PNaCl dynamic linking: Build an initial dynamically-linked newlib-based libc

src/untrusted/nacl/start.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <unistd.h>
 
 #include "native_client/src/include/elf32.h"
 #include "native_client/src/untrusted/nacl/nacl_irt.h"
 #include "native_client/src/untrusted/nacl/nacl_startup.h"
 #include "native_client/src/untrusted/nacl/start.h"
 #include "native_client/src/untrusted/nacl/tls.h"
 
 
 void __libc_init_array(void);
 void __libc_fini_array(void);
 
 /*
  * Alternative NaCl main entry point.  If this symbol name is found at
  * link time it is used in favour of 'main' as the program entry point.
  */
 int __nacl_main(int argc, char **argv, char **envp) __attribute__((weak));
 
-int main(int argc, char **argv, char **envp);
-
 void *__nacl_initial_thread_stack_end;
 
 /*
  * This is the true entry point for untrusted code.
  * See nacl_startup.h for the layout at the argument pointer.
  */
 void _start(uint32_t *info) {
   void (*fini)(void) = nacl_startup_fini(info);
   int argc = nacl_startup_argc(info);
   char **argv = nacl_startup_argv(info);
@@ skipping 26 matching lines @@
 
   int (*main_ptr)(int argc, char **argv, char **envp) = &__nacl_main;
   if (main_ptr == NULL)
     main_ptr = &main;
 
   exit(main_ptr(argc, argv, envp));
 
   /*NOTREACHED*/
   __builtin_trap();
 }