Fix __getcwd rewinddir namespace (bug 17584).

__getcwd is called from dcigettext.o (brought in by various ISO C
functionality), but calls rewinddir, which is not an ISO C function.
This patch makes __getcwd call __rewinddir instead and makes rewinddir
a weak alias for __rewinddir.

Since getcwd.c is shared with gnulib (albeit not merged in either
direction for a long time, and omitted from gnulib's
config/srclist.txt list of shared files) I put in a #ifndef _LIBC
define of __rewinddir to rewinddir, although a future merged version
of getcwd could end up looking significantly different.

Tested for x86_64 (testsuite, and that disassembly of installed shared
libraries is unchanged by this patch).

	[BZ #17584]
	* dirent/rewinddir.c (rewinddir): Rename to __rewinddir and define
	as weak alias of __rewinddir.  Don't use libc_hidden_def.
	(__rewinddir): Use libc_hidden_def.
	* sysdeps/mach/hurd/rewinddir.c: Rename to __rewinddir and define
	as weak alias of __rewinddir.  Don't use libc_hidden_def.
	(__rewinddir): Use libc_hidden_def.
	* sysdeps/posix/rewinddir.c: Rename to __rewinddir and define as
	weak alias of __rewinddir.  Don't use libc_hidden_def.
	(__rewinddir): Use libc_hidden_def.
	* include/dirent.h (rewinddir): Don't use libc_hidden_proto.
	(__rewinddir): Use libc_hidden_proto.
	* sysdeps/posix/getcwd.c [!_LIBC] (__rewinddir): Define to
	rewinddir.
	(__getcwd): Use __rewinddir instead of rewinddir.

1 files changed, 2 insertions, 1 deletions

diff --git a/include/dirent.h b/include/dirent.h
index 096a9771a1..e8e9e42de6 100644
--- a/include/dirent.h
+++ b/include/dirent.h
@@ -47,8 +47,9 @@ extern DIR *__alloc_dir (int fd, bool close_fd, int flags,
 			 const struct stat64 *statp)
      internal_function;
 extern void __scandir_cancel_handler (void *arg);
+extern __typeof (rewinddir) __rewinddir;
 
-libc_hidden_proto (rewinddir)
+libc_hidden_proto (__rewinddir)
 libc_hidden_proto (scandirat)
 libc_hidden_proto (scandirat64)
 # endif