Add std::timespec and std::timespec_get for C++17

	* configure.ac: Check for C11 timespec_get function.
	* crossconfig.m4 (freebsd, linux, gnu, cygwin, solaris, netbsd)
	(openbsd): Likewise
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/c_global/ctime (timespec, timespec_get): Add to namespace
	std for C++17 and up.

From-SVN: r268879

6 files changed, 72 insertions, 0 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 8186974..932b807 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,13 @@
 2019-02-14  Jonathan Wakely  <jwakely@redhat.com>
 
+	* configure.ac: Check for C11 timespec_get function.
+	* crossconfig.m4 (freebsd, linux, gnu, cygwin, solaris, netbsd)
+	(openbsd): Likewise
+	* config.h.in: Regenerate.
+	* configure: Regenerate.
+	* include/c_global/ctime (timespec, timespec_get): Add to namespace
+	std for C++17 and up.
+
 	* doc/xml/manual/intro.xml: Document LWG 2537 status.
 	* include/bits/stl_queue.h
 	(priority_queue(const Compare&, const Container&, const Alloc&))
diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index 225ef1b..034d91b 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -508,6 +508,9 @@
 /* Define to 1 if you have the <tgmath.h> header file. */
 #undef HAVE_TGMATH_H
 
+/* Define to 1 if you have the `timespec_get' function. */
+#undef HAVE_TIMESPEC_GET
+
 /* Define to 1 if the target supports thread-local storage. */
 #undef HAVE_TLS
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 15848e3..857f886 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -28432,6 +28432,19 @@ fi
 done
 
 
+  # C11 functions for C++17 library
+  for ac_func in timespec_get
+do :
+  ac_fn_c_check_func "$LINENO" "timespec_get" "ac_cv_func_timespec_get"
+if test "x$ac_cv_func_timespec_get" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_TIMESPEC_GET 1
+_ACEOF
+
+fi
+done
+
+
   # For iconv support.
 
       if test "X$prefix" = "XNONE"; then
@@ -53616,6 +53629,17 @@ _ACEOF
 fi
 done
 
+    for ac_func in timespec_get
+do :
+  ac_fn_c_check_func "$LINENO" "timespec_get" "ac_cv_func_timespec_get"
+if test "x$ac_cv_func_timespec_get" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_TIMESPEC_GET 1
+_ACEOF
+
+fi
+done
+
     ;;
 
   *-fuchsia*)
@@ -60232,6 +60256,17 @@ _ACEOF
 fi
 done
 
+    for ac_func in timespec_get
+do :
+  ac_fn_c_check_func "$LINENO" "timespec_get" "ac_cv_func_timespec_get"
+if test "x$ac_cv_func_timespec_get" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_TIMESPEC_GET 1
+_ACEOF
+
+fi
+done
+
 
 
 
@@ -66545,6 +66580,17 @@ _ACEOF
 fi
 done
 
+    for ac_func in timespec_get
+do :
+  ac_fn_c_check_func "$LINENO" "timespec_get" "ac_cv_func_timespec_get"
+if test "x$ac_cv_func_timespec_get" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_TIMESPEC_GET 1
+_ACEOF
+
+fi
+done
+
     ;;
   *-qnx6.1* | *-qnx6.2*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index ad5b411..6c98f27 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -265,6 +265,9 @@ if $GLIBCXX_IS_NATIVE; then
   AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
   AC_CHECK_FUNCS(_wfopen)
 
+  # C11 functions for C++17 library
+  AC_CHECK_FUNCS(timespec_get)
+
   # For iconv support.
   AM_ICONV
 
diff --git a/libstdc++-v3/crossconfig.m4 b/libstdc++-v3/crossconfig.m4
index 3de40dc..4a30300 100644
--- a/libstdc++-v3/crossconfig.m4
+++ b/libstdc++-v3/crossconfig.m4
@@ -135,6 +135,7 @@ case "${host}" in
     fi
     AC_CHECK_FUNCS(__cxa_thread_atexit)
     AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
+    AC_CHECK_FUNCS(timespec_get)
     ;;
 
   *-fuchsia*)
@@ -194,6 +195,7 @@ case "${host}" in
     GCC_CHECK_TLS
     AC_CHECK_FUNCS(__cxa_thread_atexit_impl)
     AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
+    AC_CHECK_FUNCS(timespec_get)
     AM_ICONV
     ;;
   *-mingw32*)
@@ -221,6 +223,7 @@ case "${host}" in
       AC_DEFINE(HAVE_ISNANL)
     fi
     AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
+    AC_CHECK_FUNCS(timespec_get)
     ;;
   *-qnx6.1* | *-qnx6.2*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'
diff --git a/libstdc++-v3/include/c_global/ctime b/libstdc++-v3/include/c_global/ctime
index cdd3d8d..685c821 100644
--- a/libstdc++-v3/include/c_global/ctime
+++ b/libstdc++-v3/include/c_global/ctime
@@ -72,4 +72,13 @@ namespace std
   using ::strftime;
 } // namespace
 
+#if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_TIMESPEC_GET)
+#undef timespec_get
+namespace std
+{
+  using ::timespec;
+  using ::timespec_get;
+} // namespace std
+#endif
+
 #endif