Add support for ARC to libgloss

ChangeLog:
2015-11-12  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* configure.in: Add ARC support to libgloss.
	* configure: Regenerate.

libgloss/ChangeLog:
2015-11-12  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* configure: Add ARC support.
	* configure.in: Likewise.
	* arc/Makefile.in: Likewise.
	* arc/aclocal.m4: Likewise.
	* arc/configure: Likewise.
	* arc/configure.in: Likewise.
	* arc/crt0.S: Likewise.
	* arc/libcfunc.c: Likewise.
	* arc/nsim-syscall.h: Likewise.
	* arc/nsim-syscalls.c: Likewise.
	* arc/nsim.specs: Likewise.
	* arc/sbrk.c: Likewise.

libgloss/arc/libcfunc.c

@@ -0,0 +1,92 @@
+/*
+   Copyright (c) 2015, Synopsys, Inc. All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   1) Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+   2) Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+   3) Neither the name of the Synopsys, Inc., nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+   POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* This file has been copied from libgloss/arm/libcfuncs.c.
+
+   Support files for GNU libc.  Files in the C namespace go here.
+   Files in the system namespace (ie those that start with an underscore)
+   go in syscalls.c.
+
+   Note: These functions are in a seperate file so that OS providers can
+   overrride the system call stubs (defined in syscalls.c) without having
+   to provide libc functions as well.  */
+
+#include <errno.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+unsigned __attribute__((weak))
+alarm (unsigned seconds)
+{
+	(void)seconds;
+	return 0;
+}
+
+clock_t _clock (void);
+clock_t __attribute__((weak))
+clock (void)
+{
+      return _clock ();
+}
+
+int _isatty (int fildes);
+int __attribute__((weak))
+isatty (int fildes)
+{
+	return _isatty (fildes);
+}
+
+int __attribute__((weak))
+pause (void)
+{
+	errno = ENOSYS;
+	return -1;
+}
+
+unsigned __attribute__((weak))
+sleep (unsigned seconds)
+{
+	clock_t t0 = _clock ();
+	clock_t dt = seconds * CLOCKS_PER_SEC;
+
+	while (_clock () - t0  < dt);
+	return 0;
+}
+
+int __attribute__((weak))
+usleep (useconds_t useconds)
+{
+	clock_t t0 = _clock ();
+	clock_t dt = useconds / (1000000/CLOCKS_PER_SEC);
+
+	while (_clock () - t0  < dt);
+	return 0;
+}