chrono: New, as per N2661.

2008-07-15  Chris Fairles  <chris.fairles@gmail.com>

        * include/std/chrono: New, as per N2661.
        * src/chrono.cc: New.
        * include/Makefile.am: Update.
        * src/Makefile.am: Likewise.
        * include/Makefile.in: Regenerate.
        * src/Makefile.in: Likewise.
        * acinclude.m4: Add tests for clock_gettime and gettimeofday that
	define _GLIBCXX_HAS_CLOCK_GETTIME and/or _GLIBCXX_HAS_GETTIMEOFDAY.
        * configure.ac: Use them.
        * configure: Regenerate.
        * config.h.in: Likewise.
        * config/abi/pre/gnu.ver: Add symbols for system_clock::now() and
        system_clock::is_monotonic.
        * testsuite/20_util/duration/cons/1.cc: New.
        * testsuite/20_util/duration/cons/2.cc: Likewise.
        * testsuite/20_util/duration/cons/1_neg.cc: Likewise.
        * testsuite/20_util/duration/requirements/explicit_instantiation/
        explicit_instantiation.cc: Likewise.
        * testsuite/20_util/duration/arithmetic/1.cc: Likewise.
        * testsuite/20_util/duration/arithmetic/2.cc: Likewise.
        * testsuite/20_util/duration/comparisons/1.cc: Likewise.
        * testsuite/20_util/time_point/requirements/explicit_instantiation/
        explicit_instantiation.cc: Likewise.
        * testsuite/20_util/time_point/1.cc: Likewise.
        * testsuite/20_util/time_point/2.cc: Likewise.
        * testsuite/20_util/time_point/3.cc: Likewise.
        * testsuite/20_util/clocks/1.cc: Likewise.
        * testsuite/17_intro/headers/c++200x/all_multiple_inclusion.cc: Add
        missing headers.
        * testsuite/17_intro/headers/c++200x/all.cc: Likewise.
        * include/precompiled/stdc++.h: Likewise and remove <date_time>.
        * doc/doxygen/user.cfg.in: Likewise.

From-SVN: r137858

28 files changed, 2220 insertions, 7 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index e78c7d6..3301a01 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,38 @@
+2008-07-15  Chris Fairles  <chris.fairles@gmail.com>
+
+        * include/std/chrono: New, as per N2661.
+        * src/chrono.cc: New.
+        * include/Makefile.am: Update.
+        * src/Makefile.am: Likewise.
+        * include/Makefile.in: Regenerate.
+        * src/Makefile.in: Likewise.
+        * acinclude.m4: Add tests for clock_gettime and gettimeofday that
+	define _GLIBCXX_HAS_CLOCK_GETTIME and/or _GLIBCXX_HAS_GETTIMEOFDAY.
+        * configure.ac: Use them.
+        * configure: Regenerate.
+        * config.h.in: Likewise.
+        * config/abi/pre/gnu.ver: Add symbols for system_clock::now() and
+        system_clock::is_monotonic.
+        * testsuite/20_util/duration/cons/1.cc: New.
+        * testsuite/20_util/duration/cons/2.cc: Likewise.
+        * testsuite/20_util/duration/cons/1_neg.cc: Likewise.
+        * testsuite/20_util/duration/requirements/explicit_instantiation/
+        explicit_instantiation.cc: Likewise.
+        * testsuite/20_util/duration/arithmetic/1.cc: Likewise.
+        * testsuite/20_util/duration/arithmetic/2.cc: Likewise.
+        * testsuite/20_util/duration/comparisons/1.cc: Likewise.
+        * testsuite/20_util/time_point/requirements/explicit_instantiation/
+        explicit_instantiation.cc: Likewise.
+        * testsuite/20_util/time_point/1.cc: Likewise.
+        * testsuite/20_util/time_point/2.cc: Likewise.
+        * testsuite/20_util/time_point/3.cc: Likewise.
+        * testsuite/20_util/clocks/1.cc: Likewise.
+        * testsuite/17_intro/headers/c++200x/all_multiple_inclusion.cc: Add
+        missing headers.
+        * testsuite/17_intro/headers/c++200x/all.cc: Likewise.
+        * include/precompiled/stdc++.h: Likewise and remove <date_time>.
+        * doc/doxygen/user.cfg.in: Likewise.
+
 2008-07-15  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/36832
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index a68ab9b..e998471 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -1009,6 +1009,94 @@ AC_DEFUN([GLIBCXX_ENABLE_C99], [
 
 
 dnl
+dnl Check for IEEE Std 1003.1-2001 clock_gettime required for 
+dnl 20.8.5 [time.clock] in the current C++0X working draft.
+dnl
+AC_DEFUN([GLIBCXX_CHECK_CLOCK_GETTIME], [
+
+  AC_LANG_SAVE
+  AC_LANG_CPLUSPLUS
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -fno-exceptions"
+  
+  AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
+  
+  ac_has_clock_monotonic=no;  
+  ac_has_clock_realtime=no;  
+  if test x"$ac_has_unistd_h" = x"yes"; then    
+    AC_MSG_CHECKING([for monotonic clock])
+    AC_TRY_LINK(
+      [#include <unistd.h>
+       #include <time.h>
+      ],
+      [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
+        timespec tp;     
+       #endif
+        clock_gettime(CLOCK_MONOTONIC, &tp);
+      ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
+    
+    AC_MSG_RESULT($ac_has_clock_monotonic)   
+    
+    AC_MSG_CHECKING([for realtime clock])
+    AC_TRY_LINK(
+      [#include <unistd.h>
+       #include <time.h>
+      ],
+      [#if _POSIX_TIMERS > 0
+        timespec tp;      
+       #endif
+        clock_gettime(CLOCK_REALTIME, &tp);
+      ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
+    
+    AC_MSG_RESULT($ac_has_clock_realtime)
+  fi 
+  
+  if test x"$ac_has_clock_monotonic" = x"yes"; then
+    AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
+      [ Defined if clock_gettime has monotonic clock support. ])
+  fi
+  
+  if test x"$ac_has_clock_realtime" = x"yes"; then
+    AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
+      [ Defined if clock_gettime has realtime clock support. ])
+  fi
+  
+  CXXFLAGS="$ac_save_CXXFLAGS"
+  AC_LANG_RESTORE
+])
+
+dnl
+dnl Check for IEEE Std 1003.1-2001 gettimeofday required for 
+dnl 20.8.5 [time.clock] in the current C++0X working draft.
+dnl
+AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
+  
+  AC_LANG_SAVE
+  AC_LANG_CPLUSPLUS
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -fno-exceptions"
+  
+  ac_has_gettimeofday=no;
+  AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
+  if test x"$ac_has_sys_time_h" = x"yes"; then
+    AC_MSG_CHECKING([for gettimeofday])
+    AC_TRY_LINK([#include <sys/time.h>],
+      [timeval tv; gettimeofday(&tv, 0);],
+      [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
+    
+    AC_MSG_RESULT($ac_has_gettimeofday)
+  fi
+  
+  if test x"$ac_has_gettimeofday" = x"yes"; then
+    AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
+      [ Defined if gettimeofday is available. ])
+  fi
+  
+  CXXFLAGS="$ac_save_CXXFLAGS"
+  AC_LANG_RESTORE
+])
+
+dnl
 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
 dnl facilities in Chapter 8, "C compatibility".
 dnl
diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index d107f48..256637a 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -811,6 +811,15 @@
    namespace std::tr1. */
 #undef _GLIBCXX_USE_C99_STDINT_TR1
 
+/* Defined if clock_gettime has monotonic clock support. */
+#undef _GLIBCXX_USE_CLOCK_MONOTONIC
+
+/* Defined if clock_gettime has realtime clock support. */
+#undef _GLIBCXX_USE_CLOCK_REALTIME
+
+/* Defined if gettimeofday is available. */
+#undef _GLIBCXX_USE_GETTIMEOFDAY
+
 /* Define if LFS support is available. */
 #undef _GLIBCXX_USE_LFS
 
diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index 8327d10..a9c94fc 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -885,6 +885,10 @@ GLIBCXX_3.4.11 {
     # char16_t and char32_t
     _ZNSt14numeric_limitsIu8char*;
 
+    # chrono
+    _ZNSt6chrono12system_clock12is_monotonicE;
+    _ZNSt6chrono12system_clock3nowEv;
+
 } GLIBCXX_3.4.10;
 
 # Symbols in the support library (libsupc++) have their own tag.
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 5a960cd..901a2dc 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -40947,6 +40947,571 @@ _ACEOF
 
 
 
+  # For clock_gettime support.
+
+
+
+
+  ac_ext=cc
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -fno-exceptions"
+
+
+for ac_header in unistd.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking $ac_header usability" >&5
+echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_cxx_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_header_compiler=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking $ac_header presence" >&5
+echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <$ac_header>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_cxx_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_cxx_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
+echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
+    (
+      cat <<\_ASBOX
+## ----------------------------------------- ##
+## Report this to the package-unused lists.  ##
+## ----------------------------------------- ##
+_ASBOX
+    ) |
+      sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  eval "$as_ac_Header=\$ac_header_preproc"
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+
+fi
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+ ac_has_unistd_h=yes
+else
+  ac_has_unistd_h=no
+fi
+
+done
+
+
+  ac_has_clock_monotonic=no;
+  ac_has_clock_realtime=no;
+  if test x"$ac_has_unistd_h" = x"yes"; then
+    echo "$as_me:$LINENO: checking for monotonic clock" >&5
+echo $ECHO_N "checking for monotonic clock... $ECHO_C" >&6
+    if test x$gcc_no_link = xyes; then
+  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
+echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
+   { (exit 1); exit 1; }; }
+fi
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <unistd.h>
+       #include <time.h>
+
+int
+main ()
+{
+#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
+        timespec tp;
+       #endif
+        clock_gettime(CLOCK_MONOTONIC, &tp);
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_cxx_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_has_clock_monotonic=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_has_clock_monotonic=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+
+    echo "$as_me:$LINENO: result: $ac_has_clock_monotonic" >&5
+echo "${ECHO_T}$ac_has_clock_monotonic" >&6
+
+    echo "$as_me:$LINENO: checking for realtime clock" >&5
+echo $ECHO_N "checking for realtime clock... $ECHO_C" >&6
+    if test x$gcc_no_link = xyes; then
+  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
+echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
+   { (exit 1); exit 1; }; }
+fi
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <unistd.h>
+       #include <time.h>
+
+int
+main ()
+{
+#if _POSIX_TIMERS > 0
+        timespec tp;
+       #endif
+        clock_gettime(CLOCK_REALTIME, &tp);
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_cxx_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_has_clock_realtime=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_has_clock_realtime=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+
+    echo "$as_me:$LINENO: result: $ac_has_clock_realtime" >&5
+echo "${ECHO_T}$ac_has_clock_realtime" >&6
+  fi
+
+  if test x"$ac_has_clock_monotonic" = x"yes"; then
+
+cat >>confdefs.h <<\_ACEOF
+#define _GLIBCXX_USE_CLOCK_MONOTONIC 1
+_ACEOF
+
+  fi
+
+  if test x"$ac_has_clock_realtime" = x"yes"; then
+
+cat >>confdefs.h <<\_ACEOF
+#define _GLIBCXX_USE_CLOCK_REALTIME 1
+_ACEOF
+
+  fi
+
+  CXXFLAGS="$ac_save_CXXFLAGS"
+  ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+
+  # For gettimeofday support.
+
+
+
+
+  ac_ext=cc
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -fno-exceptions"
+
+  ac_has_gettimeofday=no;
+
+for ac_header in sys/time.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking $ac_header usability" >&5
+echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_cxx_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_header_compiler=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking $ac_header presence" >&5
+echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <$ac_header>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_cxx_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_cxx_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_cxx_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
+echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
+    (
+      cat <<\_ASBOX
+## ----------------------------------------- ##
+## Report this to the package-unused lists.  ##
+## ----------------------------------------- ##
+_ASBOX
+    ) |
+      sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  eval "$as_ac_Header=\$ac_header_preproc"
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+
+fi
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+ ac_has_sys_time_h=yes
+else
+  ac_has_sys_time_h=no
+fi
+
+done
+
+  if test x"$ac_has_sys_time_h" = x"yes"; then
+    echo "$as_me:$LINENO: checking for gettimeofday" >&5
+echo $ECHO_N "checking for gettimeofday... $ECHO_C" >&6
+    if test x$gcc_no_link = xyes; then
+  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
+echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
+   { (exit 1); exit 1; }; }
+fi
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <sys/time.h>
+int
+main ()
+{
+timeval tv; gettimeofday(&tv, 0);
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_cxx_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_has_gettimeofday=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_has_gettimeofday=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+
+    echo "$as_me:$LINENO: result: $ac_has_gettimeofday" >&5
+echo "${ECHO_T}$ac_has_gettimeofday" >&6
+  fi
+
+  if test x"$ac_has_gettimeofday" = x"yes"; then
+
+cat >>confdefs.h <<\_ACEOF
+#define _GLIBCXX_USE_GETTIMEOFDAY 1
+_ACEOF
+
+  fi
+
+  CXXFLAGS="$ac_save_CXXFLAGS"
+  ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+
   # For TLS support.
 
    # Check whether --enable-tls or --disable-tls was given.
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 19501aa..b23e177 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -161,6 +161,12 @@ if $GLIBCXX_IS_NATIVE; then
   # For dev/random and dev/urandom for TR1.
   GLIBCXX_CHECK_RANDOM_TR1
 
+  # For clock_gettime support.
+  GLIBCXX_CHECK_CLOCK_GETTIME
+
+  # For gettimeofday support.
+  GLIBCXX_CHECK_GETTIMEOFDAY
+
   # For TLS support.
   GCC_CHECK_TLS
 
diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index 3c59dcb..849d64e 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -468,8 +468,8 @@ INPUT                  = @srcdir@/libsupc++/cxxabi.h \
                          include/algorithm \
                          include/array \
                          include/bitset \
+                         include/chrono \
                          include/condition_variable \
-                         include/date_time \
                          include/deque \
                          include/fstream \
                          include/functional \
@@ -489,6 +489,7 @@ INPUT                  = @srcdir@/libsupc++/cxxabi.h \
                          include/ostream \
                          include/queue \
                          include/random \
+                         include/ratio \
                          include/regex \
                          include/set \
                          include/sstream \
diff --git a/libstdc++-v3/include/Makefile.am b/libstdc++-v3/include/Makefile.am
index 5d8358b..1249930 100644
--- a/libstdc++-v3/include/Makefile.am
+++ b/libstdc++-v3/include/Makefile.am
@@ -32,6 +32,7 @@ std_headers = \
 	${std_srcdir}/array \
 	${std_srcdir}/bitset \
 	${std_srcdir}/c++0x_warning.h \
+	${std_srcdir}/chrono \
 	${std_srcdir}/complex \
 	${std_srcdir}/condition_variable \
 	${std_srcdir}/deque \
diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index 5820f26..cb52967 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -285,6 +285,7 @@ std_headers = \
 	${std_srcdir}/array \
 	${std_srcdir}/bitset \
 	${std_srcdir}/c++0x_warning.h \
+	${std_srcdir}/chrono \
 	${std_srcdir}/complex \
 	${std_srcdir}/condition_variable \
 	${std_srcdir}/deque \
diff --git a/libstdc++-v3/include/precompiled/stdc++.h b/libstdc++-v3/include/precompiled/stdc++.h
index e4b6110..b924935 100644
--- a/libstdc++-v3/include/precompiled/stdc++.h
+++ b/libstdc++-v3/include/precompiled/stdc++.h
@@ -98,8 +98,9 @@
 
 #ifdef __GXX_EXPERIMENTAL_CXX0X__
 #include <array>
-#include <date_time>
+#include <chrono>
 #include <random>
+#include <ratio>
 #include <regex>
 #include <system_error>
 #include <tuple>
diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono
new file mode 100644
index 0000000..74fee96
--- /dev/null
+++ b/libstdc++-v3/include/std/chrono
@@ -0,0 +1,626 @@
+// <chrono> -*- C++ -*-
+
+// Copyright (C) 2008 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING.  If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+/** @file include/chrono
+ *  This is a Standard C++ Library header.
+ */
+
+#ifndef _GLIBCXX_CHRONO
+#define _GLIBCXX_CHRONO 1
+
+#pragma GCC system_header
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <c++0x_warning.h>
+#else
+
+#ifdef _GLIBCXX_INCLUDE_AS_TR1
+#  error C++0x header cannot be included from TR1 header
+#endif
+
+#include <ratio>
+#include <type_traits>
+#include <limits>
+#include <ctime>
+
+#ifdef _GLIBCXX_USE_C99_STDINT_TR1
+
+namespace std 
+{
+  namespace chrono
+  {
+    template<typename _Rep, typename _Period = ratio<1>>
+      struct duration;
+
+    template<typename _Clock, typename _Duration = typename _Clock::duration>
+      struct time_point;
+  }
+
+  // 20.8.2.3 specialization of common_type (for duration)
+  template<typename _Rep1, typename _Period1, typename _Rep2, typename _Period2>
+    struct common_type<chrono::duration<_Rep1, _Period1>,
+                       chrono::duration<_Rep2, _Period2>>
+    {
+      typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type,
+        ratio<__static_gcd<_Period1::num, _Period2::num>::value,
+        (_Period1::den / __static_gcd<_Period1::den, _Period2::den>::value)
+        * _Period2::den>> type;
+    };
+  
+  // 20.8.2.3 specialization of common_type (for time_point)
+  template<typename _Clock, typename _Duration1, typename _Duration2>
+    struct common_type<chrono::time_point<_Clock, _Duration1>,
+                       chrono::time_point<_Clock, _Duration2>>
+    {
+      typedef chrono::time_point<_Clock, 
+        typename common_type<_Duration1, _Duration2>::type> type;
+    };
+
+  namespace chrono 
+  {
+    // primary template for duration_cast impl.
+    template<typename _ToDuration, typename _CF, typename _CR,
+             bool _NumIsOne = false, bool _DenIsOne = false>
+      struct __duration_cast_impl
+      {
+        template<typename _Rep, typename _Period>
+          static _ToDuration __cast(const duration<_Rep, _Period>& __d)
+          {
+            return _ToDuration(static_cast<
+              typename _ToDuration::rep>(static_cast<_CR>(__d.count())
+              * static_cast<_CR>(_CF::num)
+              / static_cast<_CR>(_CF::den)));
+          }
+      };
+
+    template<typename _ToDuration, typename _CF, typename _CR>
+      struct __duration_cast_impl<_ToDuration, _CF, _CR, true, true>
+      {
+        template<typename _Rep, typename _Period>
+          static _ToDuration __cast(const duration<_Rep, _Period>& __d)
+          {
+            return _ToDuration(
+              static_cast<typename _ToDuration::rep>(__d.count()));
+          }
+      };
+
+    template<typename _ToDuration, typename _CF, typename _CR>
+      struct __duration_cast_impl<_ToDuration, _CF, _CR, true, false>
+      {
+        template<typename _Rep, typename _Period>
+          static _ToDuration __cast(const duration<_Rep, _Period>& __d)
+          {
+            return _ToDuration(static_cast<typename _ToDuration::rep>(
+              static_cast<_CR>(__d.count()) / static_cast<_CR>(_CF::den))); 
+          }
+      };
+
+    template<typename _ToDuration, typename _CF, typename _CR>
+      struct __duration_cast_impl<_ToDuration, _CF, _CR, false, true>
+      {
+        template<typename _Rep, typename _Period>
+          static _ToDuration __cast(const duration<_Rep, _Period>& __d)
+          {
+            return _ToDuration(static_cast<typename _ToDuration::rep>(
+              static_cast<_CR>(__d.count()) * static_cast<_CR>(_CF::num)));
+          }
+      };
+
+    template<typename _ToDuration, typename _Rep, typename _Period>
+      inline _ToDuration
+      duration_cast(const duration<_Rep, _Period>& __d)
+      {
+        typedef typename
+          ratio_divide<_Period, typename _ToDuration::period>::type __cf;
+        typedef typename
+          common_type<typename _ToDuration::rep, _Rep, intmax_t>::type __cr;
+
+        return __duration_cast_impl<_ToDuration, __cf, __cr,
+          __cf::num == 1, __cf::den == 1>::__cast(__d);
+      }
+
+    template<typename _Rep>
+      struct treat_as_floating_point 
+      : is_floating_point<_Rep>
+      { };
+
+    template<typename _Rep>
+      struct duration_values
+      {
+        static const _Rep
+        zero()
+        { return _Rep(0); }
+        
+        static const _Rep
+        max()
+        { return numeric_limits<_Rep>::max(); }
+        
+        static const _Rep
+        min()
+        { return numeric_limits<_Rep>::min(); }
+      };
+
+    template<typename _Rep, typename _Period>
+      struct duration
+      {
+        static_assert(_Period::num > 0, "period must be positive");
+        
+        typedef _Rep    rep;
+        typedef _Period period;
+        
+        // construction / destruction  
+        duration ()
+        : __r(rep(0))
+        { }
+
+        template<typename _Rep2>
+          explicit duration(_Rep2 const& __rep)
+          : __r(static_cast<rep>(__rep))
+          {
+            static_assert(is_convertible<_Rep2,rep>::value == true 
+              && (treat_as_floating_point<rep>::value == true 
+              || (!treat_as_floating_point<rep>::value 
+              && !treat_as_floating_point<_Rep2>::value)), 
+              "cannot construct integral duration with floating point type");
+          }
+
+        duration(const duration& __d)
+        : __r(__d.count())
+        { }
+
+        // conversions
+        template<typename _Rep2, typename _Period2>
+          duration(const duration<_Rep2, _Period2>& __d)
+          : __r(duration_cast<duration>(__d).count())
+          {
+            static_assert(treat_as_floating_point<rep>::value == true 
+              || ratio_divide<_Period2, period>::type::den == 1, 
+              "the resulting duration is not exactly representable");
+          }
+
+        // observer
+        rep
+        count() const
+        { return __r; }
+
+        // arithmetic
+        duration
+        operator+() const 
+        { return *this; }
+
+        duration
+        operator-() const 
+        { return duration(-__r); }
+
+        duration&
+        operator++() 
+        {
+          ++__r;
+          return *this;
+        }
+
+        duration
+        operator++(int) 
+        { return duration(__r++); }
+
+        duration&
+        operator--() 
+        { 
+          --__r;
+          return *this;
+        }
+
+        duration
+        operator--(int) 
+        { return duration(__r--); }
+        
+        duration&
+        operator+=(const duration& __d)
+        {
+          __r += __d.count();
+          return *this;
+        }
+
+        duration&
+        operator-=(const duration& __d)
+        {
+          __r -= __d.count();
+          return *this;
+        }
+
+        duration&
+        operator*=(const rep& __rhs)
+        {
+          __r *= __rhs;
+          return *this;
+        }
+
+        duration&
+        operator/=(const rep& __rhs)
+        { 
+          __r /= __rhs;
+          return *this;
+        }
+
+        // special values
+        // TODO: These should be constexprs.
+        static const duration
+        zero()
+        { return duration(duration_values<rep>::zero()); }
+
+        static const duration
+        min()
+        { return duration(duration_values<rep>::min()); }
+      
+        static const duration
+        max()
+        { return duration(duration_values<rep>::max()); }
+   
+      private:    
+        rep __r;
+      };
+
+    template<typename _Rep1, typename _Period1,
+             typename _Rep2, typename _Period2>
+      inline typename common_type<duration<_Rep1, _Period1>, 
+                                  duration<_Rep2, _Period2>>::type
+      operator+(const duration<_Rep1, _Period1>& __lhs, 
+                const duration<_Rep2, _Period2>& __rhs)
+      {
+        typedef typename common_type<duration<_Rep1, _Period1>, 
+                                     duration<_Rep2, _Period2>>::type __ct;
+        return __ct(__lhs) += __rhs;
+      }
+
+    template<typename _Rep1, typename _Period1, 
+             typename _Rep2, typename _Period2>
+      inline typename common_type<duration<_Rep1, _Period1>, 
+                                  duration<_Rep2, _Period2>>::type
+      operator-(const duration<_Rep1, _Period1>& __lhs, 
+                const duration<_Rep2, _Period2>& __rhs)
+      {
+        typedef typename common_type<duration<_Rep1, _Period1>,
+                                     duration<_Rep2, _Period2>>::type __ct;
+        return __ct(__lhs) -= __rhs;
+      }
+
+    template<typename _Rep1, typename _Period, typename _Rep2>
+      inline duration<typename common_type<_Rep1, _Rep2>::type, _Period>
+      operator*(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
+      {
+        typedef typename common_type<_Rep1, _Rep2>::type __cr;
+        return duration<__cr, _Period>(__d) *= __s;
+      }
+
+    template<typename _Rep1, typename _Period, typename _Rep2>
+      inline duration<typename common_type<_Rep1, _Rep2>::type, _Period>
+      operator*(const _Rep2& __s, const duration<_Rep1, _Period>& __d)
+      { return __d * __s; }
+
+    template<typename _Tp>
+      struct __is_not_duration
+      : std::true_type
+      { };
+    
+    template<typename _Rep, typename _Period>
+      struct __is_not_duration<duration<_Rep, _Period>>
+      : std::false_type
+      { };
+  
+    template<typename _Tp, typename _Up, typename _Ep = void>
+      struct __division_impl;
+  
+    template<typename _Rep1, typename _Period, typename _Rep2>
+      struct __division_impl<duration<_Rep1, _Period>, _Rep2, 
+        typename enable_if<__is_not_duration<_Rep2>::value>::type>
+      {
+        typedef typename common_type<_Rep1, _Rep2>::type __cr;
+        typedef 
+          duration<typename common_type<_Rep1, _Rep2>::type, _Period> __rt;
+
+        static __rt
+        __divide(const duration<_Rep1, _Period>& __d, const _Rep2& __s)
+        { return duration<__cr, _Period>(__d) /= __s; }
+      };
+
+    template<typename _Rep1, typename _Period1, 
+             typename _Rep2, typename _Period2>
+      struct __division_impl<duration<_Rep1, _Period1>, 
+                             duration<_Rep2, _Period2>>
+      {
+        typedef typename common_type<duration<_Rep1, _Period1>, 
+                                     duration<_Rep2, _Period2>>::type __ct;
+        typedef typename common_type<_Rep1, _Rep2>::type __rt;
+
+        static __rt
+        __divide(const duration<_Rep1, _Period1>& __lhs, 
+                 const duration<_Rep2, _Period2>& __rhs)
+        { return __ct(__lhs).count() / __ct(__rhs).count(); }
+      };
+  
+    template<typename _Rep, typename _Period, typename _Up>
+      inline typename __division_impl<duration<_Rep, _Period>, _Up>::__rt
+      operator/(const duration<_Rep, _Period>& __d, const _Up& __u)
+      {
+        return 
+          __division_impl<duration<_Rep, _Period>, _Up>::__divide(__d, __u);
+      }
+ 
+    // comparisons
+    template<typename _Rep1, typename _Period1,
+             typename _Rep2, typename _Period2>
+      inline bool
+      operator==(const duration<_Rep1, _Period1>& __lhs, 
+                 const duration<_Rep2, _Period2>& __rhs)
+      {
+        typedef typename common_type<duration<_Rep1, _Period1>, 
+                                     duration<_Rep2, _Period2>>::type __ct;
+        return __ct(__lhs).count() == __ct(__rhs).count();
+      }
+
+    template<typename _Rep1, typename _Period1,
+             typename _Rep2, typename _Period2>
+      inline bool
+      operator<(const duration<_Rep1, _Period1>& __lhs, 
+                const duration<_Rep2, _Period2>& __rhs)
+      {
+        typedef typename common_type<duration<_Rep1, _Period1>, 
+                                     duration<_Rep2, _Period2>>::type __ct;
+        return __ct(__lhs).count() < __ct(__rhs).count();
+      }
+
+    template<typename _Rep1, typename _Period1,
+             typename _Rep2, typename _Period2>
+      inline bool
+      operator!=(const duration<_Rep1, _Period1>& __lhs, 
+                 const duration<_Rep2, _Period2>& __rhs)
+      { return !(__lhs == __rhs); }
+
+    template<typename _Rep1, typename _Period1,
+             typename _Rep2, typename _Period2>
+      inline bool
+      operator<=(const duration<_Rep1, _Period1>& __lhs, 
+                 const duration<_Rep2, _Period2>& __rhs)
+      { return !(__rhs < __lhs); }
+
+    template<typename _Rep1, typename _Period1,
+             typename _Rep2, typename _Period2>
+      inline bool 
+      operator>(const duration<_Rep1, _Period1>& __lhs, 
+                const duration<_Rep2, _Period2>& __rhs)
+      { return __rhs < __lhs; }
+
+    template<typename _Rep1, typename _Period1, 
+             typename _Rep2, typename _Period2>
+      inline bool
+      operator>=(const duration<_Rep1, _Period1>& __lhs, 
+                 const duration<_Rep2, _Period2>& __rhs)
+      { return !(__lhs < __rhs); }
+
+    typedef duration<int64_t,        nano> nanoseconds;
+    typedef duration<int64_t,       micro> microseconds;
+    typedef duration<int64_t,       milli> milliseconds;
+    typedef duration<int64_t             > seconds;
+    typedef duration<int,     ratio<  60>> minutes;
+    typedef duration<int,     ratio<3600>> hours;
+
+    template<typename _Clock, typename _Duration>
+    struct time_point
+    {
+      typedef _Clock                    clock;
+      typedef _Duration                 duration;
+      typedef typename duration::rep    rep;
+      typedef typename duration::period period;
+
+      time_point()
+      : __d(duration::zero())
+      { }
+
+      explicit time_point(const duration& __dur)
+      : __d(duration::zero() + __dur)
+      { }
+
+      // conversions
+      template<typename _Duration2>
+        time_point(const time_point<clock, _Duration2>& __t)
+        : __d(__t.time_since_epoch())
+        { }
+
+      // observer
+      duration
+      time_since_epoch() const
+      { return __d; }
+
+      // arithmetic
+      time_point&
+      operator+=(const duration& __dur)
+      {
+        __d += __dur;
+        return *this;
+      }
+
+      time_point&
+      operator-=(const duration& __dur)
+      {
+        __d -= __dur;
+        return *this;
+      }
+
+      // special values
+      // TODO: These should be constexprs.
+      static const time_point
+      min()
+      { return time_point(duration::min()); }
+
+      static const time_point
+      max()
+      { return time_point(duration::max()); }
+
+    private:
+      duration __d;
+    };
+  
+    template<typename _ToDuration, typename _Clock, typename _Duration>
+      inline time_point<_Clock, _ToDuration> 
+      time_point_cast(const time_point<_Clock, _Duration>& __t)
+      {
+        return time_point<_Clock, _ToDuration>(
+          duration_cast<_ToDuration>(__t.time_since_epoch()));  
+      }
+
+    template<typename _Clock, typename _Duration1,
+             typename _Rep2, typename _Period2>
+      inline time_point<_Clock, 
+        typename common_type<_Duration1, duration<_Rep2, _Period2>>::type>
+      operator+(const time_point<_Clock, _Duration1>& __lhs, 
+                const duration<_Rep2, _Period2>& __rhs)
+      {
+        typedef time_point<_Clock, 
+          typename common_type<_Duration1, 
+                               duration<_Rep2, _Period2>>::type> __ct;
+        return __ct(__lhs) += __rhs;
+      }
+
+    template<typename _Rep1, typename _Period1,
+             typename _Clock, typename _Duration2>
+      inline time_point<_Clock, 
+        typename common_type<duration<_Rep1, _Period1>, _Duration2>::type>
+      operator+(const duration<_Rep1, _Period1>& __lhs, 
+                const time_point<_Clock, _Duration2>& __rhs)
+      { return __rhs + __lhs; }
+
+    template<typename _Clock, typename _Duration1,
+             typename _Rep2, typename _Period2>
+      inline time_point<_Clock, 
+        typename common_type<_Duration1, duration<_Rep2, _Period2>>::type>
+      operator-(const time_point<_Clock, _Duration1>& __lhs, 
+                const duration<_Rep2, _Period2>& __rhs)
+      { return __lhs + (-__rhs); }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline typename common_type<_Duration1, _Duration2>::type
+      operator-(const time_point<_Clock, _Duration1>& __lhs, 
+                const time_point<_Clock, _Duration2>& __rhs)
+      { return __lhs.time_since_epoch() - __rhs.time_since_epoch(); }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline bool
+      operator==(const time_point<_Clock, _Duration1>& __lhs,
+                 const time_point<_Clock, _Duration2>& __rhs)
+      { return __lhs.time_since_epoch() == __rhs.time_since_epoch(); }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline bool
+      operator!=(const time_point<_Clock, _Duration1>& __lhs,
+                 const time_point<_Clock, _Duration2>& __rhs)
+      { return !(__lhs == __rhs); }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline bool
+      operator<(const time_point<_Clock, _Duration1>& __lhs,
+                const time_point<_Clock, _Duration2>& __rhs)
+      { return  __lhs.time_since_epoch() < __rhs.time_since_epoch(); }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline bool
+      operator<=(const time_point<_Clock, _Duration1>& __lhs,
+                 const time_point<_Clock, _Duration2>& __rhs)
+      { return !(__rhs < __lhs); }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline bool
+      operator>(const time_point<_Clock, _Duration1>& __lhs,
+                const time_point<_Clock, _Duration2>& __rhs)
+      { return __rhs < __lhs; }
+
+    template<typename _Clock, typename _Duration1, typename _Duration2>
+      inline bool
+      operator>=(const time_point<_Clock, _Duration1>& __lhs,
+                 const time_point<_Clock, _Duration2>& __rhs)
+      { return !(__lhs < __rhs); }
+
+    struct system_clock
+    {
+#if defined(_GLIBCXX_USE_CLOCK_MONOTONIC) || \
+    defined(_GLIBCXX_USE_CLOCK_REALTIME)
+      typedef chrono::nanoseconds     duration;      
+#elif defined(_GLIBCXX_USE_GETTIMEOFDAY)
+      typedef chrono::microseconds    duration;      
+#else
+      typedef chrono::seconds         duration;      
+#endif
+
+      typedef duration::rep    rep;
+      typedef duration::period period;
+      typedef chrono::time_point<system_clock, duration> time_point;
+
+#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
+      static const bool is_monotonic = true;
+#else
+      static const bool is_monotonic = false;
+#endif      
+
+      static time_point
+      now();      
+
+      // Map to C API
+      static std::time_t
+      to_time_t(const time_point& __t)
+      {
+        return std::time_t(
+          duration_cast<chrono::seconds>(__t.time_since_epoch()).count());
+      }
+
+      static time_point
+      from_time_t(std::time_t __t)
+      { 
+        return time_point_cast<system_clock::duration>(
+          chrono::time_point<system_clock, chrono::seconds>(
+            chrono::seconds(__t)));
+      }
+
+      // TODO: requires constexpr
+      /*  
+      static_assert(
+        system_clock::duration::min() < 
+        system_clock::duration::zero(), 
+        "a clock's minimum duration cannot be less than its epoch");
+      */
+    };
+
+    typedef system_clock high_resolution_clock;
+    typedef system_clock monotonic_clock;    
+  }
+}
+
+#endif //_GLIBCXX_USE_C99_STDINT_TR1
+
+#endif //__GXX_EXPERIMENTAL_CXX0X__
+
+#endif //_GLIBCXX_CHRONO
diff --git a/libstdc++-v3/src/Makefile.am b/libstdc++-v3/src/Makefile.am
index 8d2cbf5..d41f3eb 100644
--- a/libstdc++-v3/src/Makefile.am
+++ b/libstdc++-v3/src/Makefile.am
@@ -186,6 +186,7 @@ sources = \
 	wstring-inst.cc \
 	mutex.cc \
 	condition_variable.cc \
+	chrono.cc \
 	${host_sources} \
 	${host_sources_extra} 
 
@@ -272,6 +273,11 @@ atomic.lo: atomic.cc
 atomic.o: atomic.cc
 	$(CXXCOMPILE) -x c++ -std=gnu++0x -c $<
 
+chrono.lo: chrono.cc
+	$(LTCXXCOMPILE) -std=gnu++0x -c $<
+chrono.o: chrono.cc
+	$(CXXCOMPILE) -std=gnu++0x -c $<
+
 if GLIBCXX_LDBL_COMPAT
 # Use special rules for compatibility-ldbl.cc compilation, as we need to
 # pass -mlong-double-64.
diff --git a/libstdc++-v3/src/Makefile.in b/libstdc++-v3/src/Makefile.in
index f0e9897..27c9b70 100644
--- a/libstdc++-v3/src/Makefile.in
+++ b/libstdc++-v3/src/Makefile.in
@@ -84,10 +84,10 @@ am__libstdc___la_SOURCES_DIST = atomic.cc bitmap_allocator.cc \
 	istream-inst.cc istream.cc locale-inst.cc misc-inst.cc \
 	ostream-inst.cc sstream-inst.cc streambuf-inst.cc streambuf.cc \
 	string-inst.cc valarray-inst.cc wlocale-inst.cc \
-	wstring-inst.cc mutex.cc condition_variable.cc atomicity.cc \
-	codecvt_members.cc collate_members.cc ctype_members.cc \
-	messages_members.cc monetary_members.cc numeric_members.cc \
-	time_members.cc basic_file.cc c++locale.cc \
+	wstring-inst.cc mutex.cc condition_variable.cc chrono.cc \
+	atomicity.cc codecvt_members.cc collate_members.cc \
+	ctype_members.cc messages_members.cc monetary_members.cc \
+	numeric_members.cc time_members.cc basic_file.cc c++locale.cc \
 	compatibility-ldbl.cc parallel_list.cc parallel_settings.cc
 am__objects_1 = atomicity.lo codecvt_members.lo collate_members.lo \
 	ctype_members.lo messages_members.lo monetary_members.lo \
@@ -109,7 +109,7 @@ am__objects_5 = atomic.lo bitmap_allocator.lo pool_allocator.lo \
 	istream-inst.lo istream.lo locale-inst.lo misc-inst.lo \
 	ostream-inst.lo sstream-inst.lo streambuf-inst.lo streambuf.lo \
 	string-inst.lo valarray-inst.lo wlocale-inst.lo \
-	wstring-inst.lo mutex.lo condition_variable.lo \
+	wstring-inst.lo mutex.lo condition_variable.lo chrono.lo \
 	$(am__objects_1) $(am__objects_4)
 am_libstdc___la_OBJECTS = $(am__objects_5)
 libstdc___la_OBJECTS = $(am_libstdc___la_OBJECTS)
@@ -422,6 +422,7 @@ sources = \
 	wstring-inst.cc \
 	mutex.cc \
 	condition_variable.cc \
+	chrono.cc \
 	${host_sources} \
 	${host_sources_extra} 
 
@@ -866,6 +867,11 @@ atomic.lo: atomic.cc
 atomic.o: atomic.cc
 	$(CXXCOMPILE) -x c++ -std=gnu++0x -c $<
 
+chrono.lo: chrono.cc
+	$(LTCXXCOMPILE) -std=gnu++0x -c $<
+chrono.o: chrono.cc
+	$(CXXCOMPILE) -std=gnu++0x -c $<
+
 # Use special rules for compatibility-ldbl.cc compilation, as we need to
 # pass -mlong-double-64.
 @GLIBCXX_LDBL_COMPAT_TRUE@compatibility-ldbl.lo: compatibility-ldbl.cc
diff --git a/libstdc++-v3/src/chrono.cc b/libstdc++-v3/src/chrono.cc
new file mode 100644
index 0000000..88fb4c1
--- /dev/null
+++ b/libstdc++-v3/src/chrono.cc
@@ -0,0 +1,76 @@
+// chrono -*- C++ -*-
+
+// Copyright (C) 2008 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#include <chrono>
+
+#ifdef _GLIBCXX_USE_C99_STDINT_TR1
+
+// conditional inclusion of sys/time.h for gettimeofday
+#if !defined(_GLIBCXX_USE_CLOCK_MONOTONIC) && \
+    !defined(_GLIBCXX_USE_CLOCK_REALTIME) && \
+     defined(_GLIBCXX_USE_GETTIMEOFDAY)
+#include <sys/time.h>
+#endif
+
+namespace std
+{
+  namespace chrono
+  {
+    const bool system_clock::is_monotonic;
+
+    system_clock::time_point
+    system_clock::now()
+    {
+#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
+        timespec tp;
+        // -EINVAL, -EFAULT
+        clock_gettime(CLOCK_MONOTONIC, &tp);
+        return time_point(duration(chrono::seconds(tp.tv_sec)
+                                   + chrono::nanoseconds(tp.tv_nsec)));
+#elif defined(_GLIBCXX_USE_CLOCK_REALTIME)
+        timespec tp;
+        // -EINVAL, -EFAULT
+        clock_gettime(CLOCK_REALTIME, &tp);
+        return time_point(duration(chrono::seconds(tp.tv_sec)
+                                   + chrono::nanoseconds(tp.tv_nsec)));
+#elif defined(_GLIBCXX_USE_GETTIMEOFDAY)
+        timeval tv;
+        // EINVAL, EFAULT
+        gettimeofday(&tv, NULL);
+        return time_point(duration(chrono::seconds(tv.tv_sec)
+                                   + chrono::microseconds(tv.tv_usec)));
+#else
+        std::time_t __sec = std::time(0);
+        return system_clock::from_time_t(__sec);
+#endif
+    }
+  }
+}
+
+#endif // _GLIBCXX_USE_C99_STDINT_TR1
diff --git a/libstdc++-v3/testsuite/17_intro/headers/c++200x/all.cc b/libstdc++-v3/testsuite/17_intro/headers/c++200x/all.cc
index 7988666..4c2e31b 100644
--- a/libstdc++-v3/testsuite/17_intro/headers/c++200x/all.cc
+++ b/libstdc++-v3/testsuite/17_intro/headers/c++200x/all.cc
@@ -95,6 +95,7 @@
 #include <algorithm>
 #include <array>
 #include <bitset>
+#include <chrono>
 #include <condition_variable>
 #include <complex>
 #include <deque>
@@ -118,6 +119,7 @@
 #include <ostream>
 #include <queue>
 #include <random>
+#include <ratio>
 #include <regex>
 #include <set>
 #include <sstream>
diff --git a/libstdc++-v3/testsuite/17_intro/headers/c++200x/all_multiple_inclusion.cc b/libstdc++-v3/testsuite/17_intro/headers/c++200x/all_multiple_inclusion.cc
index 814fbc3..f88edc8 100644
--- a/libstdc++-v3/testsuite/17_intro/headers/c++200x/all_multiple_inclusion.cc
+++ b/libstdc++-v3/testsuite/17_intro/headers/c++200x/all_multiple_inclusion.cc
@@ -93,6 +93,7 @@
 #include <algorithm>
 #include <array>
 #include <bitset>
+#include <chrono>
 #include <complex>
 #include <deque>
 #include <exception>
@@ -114,6 +115,7 @@
 #include <ostream>
 #include <queue>
 #include <random>
+#include <ratio>
 #include <regex>
 #include <set>
 #include <sstream>
@@ -203,6 +205,7 @@
 #include <algorithm>
 #include <array>
 #include <bitset>
+#include <chrono>
 #include <complex>
 #include <deque>
 #include <exception>
@@ -219,11 +222,13 @@
 #include <locale>
 #include <map>
 #include <memory>
+#include <mutex>
 #include <new>
 #include <numeric>
 #include <ostream>
 #include <queue>
 #include <random>
+#include <ratio>
 #include <regex>
 #include <set>
 #include <sstream>
diff --git a/libstdc++-v3/testsuite/20_util/clocks/1.cc b/libstdc++-v3/testsuite/20_util/clocks/1.cc
new file mode 100644
index 0000000..bcbe210
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/clocks/1.cc
@@ -0,0 +1,39 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.5 Clocks [time.clock]
+
+#include <chrono>
+
+// 20.8.5.1 system_clock [time.clock.system]
+int
+main()
+{
+  using namespace std::chrono;
+
+  system_clock::time_point t1 = system_clock::now();
+  bool is_monotonic = system_clock::is_monotonic;
+  is_monotonic = is_monotonic; // suppress unused warning
+  std::time_t t2 = system_clock::to_time_t(t1);
+  system_clock::time_point t3 = system_clock::from_time_t(t2);
+  
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/duration/arithmetic/1.cc b/libstdc++-v3/testsuite/20_util/duration/arithmetic/1.cc
new file mode 100644
index 0000000..55533eb
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/arithmetic/1.cc
@@ -0,0 +1,94 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.3 Class template duration [time.duration]
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+// 20.8.3.3 duration arithmetic [time.duration.arithmetic] (unary member ops)
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  duration<int> d0(3);
+  duration<int> d1 = -d0;
+  VERIFY(d0.count() == 3);
+  VERIFY(d1.count() == -3);
+  
+  duration<int> d2 = (+d0);
+  VERIFY(d2.count() == 3);
+    
+  duration<int> d3(++d2);
+  VERIFY(d2.count() == 4);
+  VERIFY(d3.count() == 4);
+    
+  duration<int> d4(d3++);
+  VERIFY(d3.count() == 5);
+  VERIFY(d4.count() == 4);
+  
+  duration<int> d5(--d4);
+  VERIFY(d4.count() == 3);
+  VERIFY(d5.count() == 3);
+  
+  duration<int> d6(d5--);
+  VERIFY(d5.count() == 2);
+  VERIFY(d6.count() == 3);
+}
+
+// 20.8.3.3 duration arithmetic [time.duration.arithmetic] (binary member ops)
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  duration<int> d7(3);
+  duration<int> d8(9);
+  d7 += d8;
+  VERIFY(d7.count() == 12);
+  VERIFY(d8.count() == 9);
+  
+  duration<int> d9(3);
+  duration<int> d10(9);
+  d9 -= d10;
+  VERIFY(d9.count() == -6);
+  VERIFY(d10.count() == 9);
+  
+  duration<int> d11(9);
+  int i = 3;
+  d11 *= i;
+  VERIFY(d11.count() == 27);
+    
+  duration<int> d12(12);  
+  d12 /= i;
+  VERIFY(d12.count() == 4);
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/duration/arithmetic/2.cc b/libstdc++-v3/testsuite/20_util/duration/arithmetic/2.cc
new file mode 100644
index 0000000..e096334
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/arithmetic/2.cc
@@ -0,0 +1,62 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.3 Class template duration [time.duration]
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+// 20.8.3.5 duration non-member arithmetic [time.duration.nonmember]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  duration<int> d0(12);
+  duration<int> d1(3);
+  int i = 3;
+  
+  duration<int> d2 = d0 + d1;
+  VERIFY(d2.count() == 15);
+  
+  duration<int> d3 = d0 - d1;
+  VERIFY(d3.count() == 9);
+
+  duration<int> d4 = d0 * i;
+  VERIFY(d4.count() == 36);
+  
+  duration<int> d5 = i * d0;
+  VERIFY(d5.count() == 36);
+ 
+  duration<int> d6 = d0 / i;
+  VERIFY(d6.count() == 4);
+  
+  int j = d0 / d1;
+  VERIFY(j == 4);
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/duration/comparisons/1.cc b/libstdc++-v3/testsuite/20_util/duration/comparisons/1.cc
new file mode 100644
index 0000000..31ac42d
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/comparisons/1.cc
@@ -0,0 +1,56 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.3 Class template duration [time.duration]
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+// 20.8.3.6 duration comparisons [time.duration.comparisons]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  duration<int> d0(12);
+  duration<int> d1(3);
+  duration<int> d2(3);
+  
+  VERIFY(d1 < d0);  
+  VERIFY(d0 > d1);
+  
+  VERIFY(d0 != d1);
+  VERIFY(d1 == d2);
+  
+  VERIFY(d1 <= d2);
+  VERIFY(d1 >= d2);
+  
+  VERIFY(d1 <= d0);
+  VERIFY(d0 >= d1);  
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/duration/cons/1.cc b/libstdc++-v3/testsuite/20_util/duration/cons/1.cc
new file mode 100644
index 0000000..6d12dbb
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/cons/1.cc
@@ -0,0 +1,138 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.3 Class template duration [time.duration]
+
+#include <chrono>
+#include <type_traits>
+#include <testsuite_hooks.h>
+
+template<typename T>
+struct type_emulator
+{
+  type_emulator()
+  : i(T(0)) { }
+  
+  type_emulator(T j)
+  : i(j) { }
+  
+  type_emulator(const type_emulator& e)
+  : i(e.i) { }
+
+  type_emulator&
+  operator*=(type_emulator a)
+  {
+    i *= a.i;
+    return *this;
+  }
+  
+  type_emulator&
+  operator+=(type_emulator a)
+  {
+    i += a.i;
+    return *this;
+  }
+    
+  operator T ()
+  { return i; }
+  
+  T i;
+};
+
+template<typename T>
+bool
+operator==(type_emulator<T> a, type_emulator<T> b)
+{ return a.i == b.i; }
+
+template<typename T>
+bool
+operator<(type_emulator<T> a, type_emulator<T> b)
+{ return a.i < b.i; }
+
+template<typename T>
+type_emulator<T>
+operator+(type_emulator<T> a, type_emulator<T> b)
+{ return a += b; }
+
+template<typename T>
+type_emulator<T>
+operator*(type_emulator<T> a, type_emulator<T> b)
+{ return a *= b; }
+
+namespace std
+{
+  template<typename T, typename U>
+  struct common_type<type_emulator<T>, U>
+  { typedef typename common_type<T,U>::type type; };
+
+  template<typename T, typename U>
+  struct common_type<U, type_emulator<T>>
+  { typedef typename common_type<U,T>::type type; };
+
+  template<typename T, typename U>
+  struct common_type<type_emulator<T>, type_emulator<U>>
+  { typedef typename common_type<T,U>::type type; };
+
+  namespace chrono
+  {    
+    template<typename T>
+    struct treat_as_floating_point<type_emulator<T>>
+    : is_floating_point<T>
+    { };
+  }
+}
+
+typedef type_emulator<int> int_emulator;
+typedef type_emulator<double> dbl_emulator;
+
+// 20.8.3.1 duration constructors [time.duration.cons]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using std::chrono::duration;
+  
+  duration<int> d0;
+  VERIFY(d0.count() == static_cast<duration<int>::rep>(0));
+
+  int r = 3;
+  duration<int> d1(r);
+  VERIFY(d1.count() == static_cast<duration<int>::rep>(r));
+  
+  double s = 8.0;
+  duration<double> d2(s);
+  VERIFY(d2.count() == static_cast<duration<double>::rep>(s));
+    
+  int_emulator ie(3);
+  duration<int_emulator> d3(ie);
+  VERIFY(d3.count() == static_cast<duration<int_emulator>::rep>(ie));
+  
+  dbl_emulator de(4.0);
+  duration<dbl_emulator> d4(de);
+  VERIFY(d4.count() == static_cast<duration<dbl_emulator>::rep>(de));
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/duration/cons/1_neg.cc b/libstdc++-v3/testsuite/20_util/duration/cons/1_neg.cc
new file mode 100644
index 0000000..8710d74
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/cons/1_neg.cc
@@ -0,0 +1,46 @@
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.3.1 duration constructors [time.duration.cons]
+
+#include <chrono>
+
+void
+test01()
+{
+  std::chrono::duration<int> d1(1.0);
+}
+
+void
+test02()
+{
+  using namespace std::chrono;
+  
+  duration<int, std::micro> d2(8);
+  duration<int, std::milli> d2_copy(d2);
+}
+
+// { dg-error "instantiated from here" "" { target *-*-* } 30 }
+// { dg-error "instantiated from here" "" { target *-*-* } 39 }
+// { dg-error "not exactly representable" "" { target *-*-* } 202 }
+// { dg-error "integral duration with floating point" "" { target *-*-* } 186 }
+// { dg-excess-errors "In instantiation of" }
diff --git a/libstdc++-v3/testsuite/20_util/duration/cons/2.cc b/libstdc++-v3/testsuite/20_util/duration/cons/2.cc
new file mode 100644
index 0000000..b491224
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/cons/2.cc
@@ -0,0 +1,120 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.3 Class template duration [time.duration]
+
+#include <chrono>
+#include <type_traits>
+#include <testsuite_hooks.h>
+
+template<typename T>
+struct type_emulator
+{
+  type_emulator() : i(T(0)) { }
+  type_emulator(T j) : i(j) { }
+  type_emulator(const type_emulator& e) : i(e.i) { }
+
+  type_emulator& operator*=(type_emulator a)
+  { i *= a.i; return *this; }
+  
+  type_emulator& operator+=(type_emulator a)
+  { i += a.i; return *this; }
+    
+  operator T () { return i; }
+  T i;
+};
+
+template<typename T>
+bool operator==(type_emulator<T> a, type_emulator<T> b)
+{ return a.i == b.i; }
+
+template<typename T>
+bool operator<(type_emulator<T> a, type_emulator<T> b)
+{ return a.i < b.i; }
+
+template<typename T>
+type_emulator<T> operator+(type_emulator<T> a, type_emulator<T> b)
+{ return a += b; }
+
+template<typename T>
+type_emulator<T> operator*(type_emulator<T> a, type_emulator<T> b)
+{ return a *= b; }
+
+namespace std
+{
+  template<typename T, typename U>
+  struct common_type<type_emulator<T>, U>
+  { typedef typename common_type<T,U>::type type; };
+  
+  template<typename T, typename U>
+  struct common_type<U, type_emulator<T>>
+  { typedef typename common_type<U,T>::type type; };
+  
+  template<typename T, typename U>
+  struct common_type<type_emulator<T>, type_emulator<U>>
+  { typedef typename common_type<T,U>::type type; };
+  
+  namespace chrono
+  {    
+    template<typename T>
+    struct treat_as_floating_point<type_emulator<T>>
+    : is_floating_point<T>
+    { };
+  }
+}
+
+typedef type_emulator<int> int_emulator;
+typedef type_emulator<double> dbl_emulator;
+
+// 20.8.3.1 duration constructors [time.duration.cons]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  duration<int> d0(3);
+  duration<int> d0_copy(d0);
+  VERIFY(d0_copy.count() == d0.count());
+  
+  duration<int, std::milli> d1(5);
+  duration<int, std::micro> d1_copy(d1);
+  VERIFY(d1.count() * 1000 == d1_copy.count());
+  
+  duration<double, std::micro> d2(8.0);
+  duration<double, std::milli> d2_copy(d2);
+  VERIFY(d2.count() == d2_copy.count() * 1000.0);
+  
+  duration<int_emulator, std::milli> d3(5);
+  duration<int_emulator, std::micro> d3_copy(d3);
+  VERIFY(d3.count() * 1000 == d3_copy.count());
+  
+  duration<dbl_emulator, std::micro> d4(5.0);
+  duration<dbl_emulator, std::milli> d4_copy(d4);
+  VERIFY(d4.count() == d4_copy.count() * dbl_emulator(1000.0));
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/duration/requirements/explicit_instantiation/explicit_instantiation.cc b/libstdc++-v3/testsuite/20_util/duration/requirements/explicit_instantiation/explicit_instantiation.cc
new file mode 100644
index 0000000..76134118
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/requirements/explicit_instantiation/explicit_instantiation.cc
@@ -0,0 +1,27 @@
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING.  If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA.
+
+#include <ratio>
+#include <chrono>
+
+template class std::chrono::duration<int>;
+template class std::chrono::duration<float, std::ratio<2,3>>;
diff --git a/libstdc++-v3/testsuite/20_util/time_point/1.cc b/libstdc++-v3/testsuite/20_util/time_point/1.cc
new file mode 100644
index 0000000..70f4d78
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/time_point/1.cc
@@ -0,0 +1,49 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.4 Class template time_point [time.point]
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+// 20.8.4.1 time_point constructors [time.point.cons]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  time_point<system_clock> t1;
+  VERIFY(t1.time_since_epoch() == system_clock::duration::zero());
+
+  time_point<monotonic_clock> t2;
+  VERIFY(t2.time_since_epoch() == monotonic_clock::duration::zero());
+
+  time_point<high_resolution_clock> t3;
+  VERIFY(t3.time_since_epoch() == high_resolution_clock::duration::zero());
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/time_point/2.cc b/libstdc++-v3/testsuite/20_util/time_point/2.cc
new file mode 100644
index 0000000..91f21a5
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/time_point/2.cc
@@ -0,0 +1,72 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.4 Class template time_point [time.point]
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+// 20.8.4.3 time_point arithmetic [time.point.arithmetic]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  time_point<system_clock> t1, t2;
+  t1 += seconds(1);
+  VERIFY(t2.time_since_epoch() + seconds(1) == t1.time_since_epoch());
+  
+  t1 -= std::chrono::seconds(1);
+  VERIFY(t2.time_since_epoch() == t1.time_since_epoch());
+}
+
+// 20.8.4.5 time_point non-member arithmetic [time.point.nonmember]
+void
+test02()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  time_point<system_clock> t1;
+  time_point<system_clock> t2(t1 + seconds(1));
+  VERIFY(t2.time_since_epoch() == t1.time_since_epoch() + seconds(1));
+ 
+  time_point<system_clock> t3(seconds(1) + t1);
+  VERIFY(t3.time_since_epoch() == t1.time_since_epoch() + seconds(1));
+  
+  time_point<system_clock> t4(seconds(1));
+  time_point<system_clock> t5(seconds(2));
+  
+  time_point<system_clock> t6(t5 - seconds(1));
+  VERIFY(t6.time_since_epoch() == t4.time_since_epoch());
+  
+  time_point<system_clock> t7(t5 - t4);
+  VERIFY(t7.time_since_epoch() == t4.time_since_epoch());
+}
+
+int
+main()
+{
+  test01();
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/time_point/3.cc b/libstdc++-v3/testsuite/20_util/time_point/3.cc
new file mode 100644
index 0000000..20820ce
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/time_point/3.cc
@@ -0,0 +1,53 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// 20.8.4 Class template time_point [time.point]
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+// 20.8.4.6 time_point comparisons [time.point.comparisons]
+void
+test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std::chrono;
+  
+  time_point<system_clock> t1(seconds(1));
+  time_point<system_clock> t2(seconds(1));
+  time_point<system_clock> t3(seconds(2));
+  
+  VERIFY(t1 == t2);
+  VERIFY(t1 != t3);
+  VERIFY(t1 < t3);
+  VERIFY(t1 <= t3);
+  VERIFY(t1 <= t2);
+  VERIFY(t3 > t1);
+  VERIFY(t3 >= t1);
+  VERIFY(t2 >= t1);  
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/20_util/time_point/requirements/explicit_instantiation/explicit_instantiation.cc b/libstdc++-v3/testsuite/20_util/time_point/requirements/explicit_instantiation/explicit_instantiation.cc
new file mode 100644
index 0000000..7f9bbdf
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/time_point/requirements/explicit_instantiation/explicit_instantiation.cc
@@ -0,0 +1,25 @@
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+// { dg-require-cstdint "" }
+
+// Copyright (C) 2008 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING.  If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA.
+
+#include <chrono>
+
+template class std::chrono::time_point<std::chrono::system_clock>;