Share vtables instead of replicating them for each unit.
2012-03-16 Janne Blomqvist <jb@gcc.gnu.org>
* io/unix.h (struct stream): Rename to stream_vtable.
(struct stream): New struct definition.
(sread): Dereference vtable pointer.
(swrite): Likewise.
(sseek): Likewise.
(struncate): Likewise.
(sflush): Likewise.
(sclose): Likewise.
* io/unix.c (raw_vtable): New variable.
(buf_vtable): Likewise.
(mem_vtable): Likewise.
(mem4_vtable): Likewise.
(raw_init): Assign vtable pointer.
(buf_init): Likewise.
(open_internal): Likewise.
(open_internal4): Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@185454
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