* dcrt0.cc (__argc_safe): New variable.

(dll_crt0_1): Store argc in __argc_safe, which will theoretically remain
untouched by the user.
* fhandler_console.cc (fhandler_console::read): Silence some compiler warnings.
* fhandler_raw.cc (fhandler_dev_raw::raw_read): Ditto.
* pinfo.cc (_pinfo::commune_recv): Carefully bound argv scan and check for
potentially bad pointers since user could have set argv cell to anythinw.
* cygheap.h (CYGHEAPSIZE): Bump up size.

winsup/cygwin/fhandler_console.cc

@@ -507,12 +507,12 @@ fhandler_console::read (void *pv, size_t& buflen)
 
 err:
   __seterrno ();
-  (ssize_t) buflen = -1;
+  buflen = (size_t) -1;
   return;
 
  sig_exit:
   set_sig_errno (EINTR);
-  (ssize_t) buflen = -1;
+  buflen = (size_t) -1;
   return;
 }