hurd: Do not hide rtld symbols which need to be preempted

	* sysdeps/generic/dl-fcntl.h: New file, adds attribute_hidden to __open
	and __fcntl.
	* sysdeps/mach/hurd/dl-fcntl.h: New file, adds attribute_hidden to
	__fcntl only.
	* include/fcntl.h [IS_IN (rtld)]: Include <dl-fcntl.h> instead of
	adding attribute_hidden to __open and __fcntl.

ChangeLog

@@ -1,3 +1,12 @@
+2016-03-20  Samuel Thibault  <samuel.thibault@ens-lyon.org>:
+
+	* sysdeps/generic/dl-fcntl.h: New file, adds attribute_hidden to __open
+	and __fcntl.
+	* sysdeps/mach/hurd/dl-fcntl.h: New file, adds attribute_hidden to
+	__fcntl only.
+	* include/fcntl.h [IS_IN (rtld)]: Include <dl-fcntl.h> instead of
+	adding attribute_hidden to __open and __fcntl.
+
 2016-03-20  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* sysdeps/mach/hurd/Makefile ($(common-objpfx)errnos.d): Strip

include/fcntl.h

@@ -31,8 +31,7 @@ extern int __openat64_2 (int __fd, const char *__path, int __oflag);
 
 
 #if IS_IN (rtld)
-extern __typeof (__open) __open attribute_hidden;
-extern __typeof (__fcntl) __fcntl attribute_hidden;
+#  include <dl-fcntl.h>
 #endif
 
 /* Flag determining whether the *at system calls are available.  */

sysdeps/generic/dl-fcntl.h

@@ -0,0 +1,21 @@
+/* Functions with hidden attribute internal to ld.so, which are declared
+   in include/fcntl.h.  Generic version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+extern __typeof (__open) __open attribute_hidden;
+extern __typeof (__fcntl) __fcntl attribute_hidden;

sysdeps/mach/hurd/dl-fcntl.h

@@ -0,0 +1,22 @@
+/* Functions with hidden attribute internal to ld.so, which are declared
+   in include/fcntl.h.  Hurd version.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* __open can't be hidden in ld.so on Hurd since it will be preempted by the
+   one in libc.so after bootstrap.  */
+extern __typeof (__fcntl) __fcntl attribute_hidden;