RTEMS: Enable some libstdc++ features

libstdc++/

	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Add rtems*.
	(GLIBCXX_ENABLE_FILESYSTEM_TS): Likewise.
	* configure: Regenerate.

From-SVN: r254985

libstdc++-v3/ChangeLog

+2017-11-21  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Add rtems*.
+	(GLIBCXX_ENABLE_FILESYSTEM_TS): Likewise.
+	* configure: Regenerate.
+
 2017-11-20  François Dumont  <fdumont@gcc.gnu.org>
 
 	* include/bits/streambuf_iterator.h (istreambuf_iterator<>): Declare

libstdc++-v3/acinclude.m4

@@ -1422,7 +1422,7 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
         ac_has_nanosleep=yes
         ac_has_sched_yield=yes
         ;;
-      freebsd*|netbsd*|dragonfly*)
+      freebsd*|netbsd*|dragonfly*|rtems*)
         ac_has_clock_monotonic=yes
         ac_has_clock_realtime=yes
         ac_has_nanosleep=yes
@@ -4294,6 +4294,9 @@ AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
       gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
         enable_libstdcxx_filesystem_ts=yes
         ;;
+      rtems*)
+        enable_libstdcxx_filesystem_ts=yes
+        ;;
       solaris*)
         enable_libstdcxx_filesystem_ts=yes
         ;;

libstdc++-v3/configure

@@ -20568,7 +20568,7 @@ $as_echo "$glibcxx_glibc217" >&6; }
         ac_has_nanosleep=yes
         ac_has_sched_yield=yes
         ;;
-      freebsd*|netbsd*|dragonfly*)
+      freebsd*|netbsd*|dragonfly*|rtems*)
         ac_has_clock_monotonic=yes
         ac_has_clock_realtime=yes
         ac_has_nanosleep=yes
@@ -79998,6 +79998,9 @@ $as_echo_n "checking whether to build Filesystem TS support... " >&6; }
       gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
         enable_libstdcxx_filesystem_ts=yes
         ;;
+      rtems*)
+        enable_libstdcxx_filesystem_ts=yes
+        ;;
       solaris*)
         enable_libstdcxx_filesystem_ts=yes
         ;;