maint: update copyright

[gnulib.git] / m4 / clock_time.m4

diff --git a/m4/clock_time.m4 b/m4/clock_time.m4
index 0cedfe4..6c4a637 100644 (file)
--- a/m4/clock_time.m4
+++ b/m4/clock_time.m4
@@ -1,14 +1,18 @@
-# clock_time.m4 serial 6
-dnl Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+# clock_time.m4 serial 10
+dnl Copyright (C) 2002-2006, 2009-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
-# Check for clock_gettime and clock_settime, and sets LIB_CLOCK_GETTIME.
+# Check for clock_gettime and clock_settime, and set LIB_CLOCK_GETTIME.
+# For a program named, say foo, you should add a line like the following
+# in the corresponding Makefile.am file:
+# foo_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
+
 AC_DEFUN([gl_CLOCK_TIME],
 [
-  # dnl Persuade glibc <time.h> to declare these functions.
-  AC_REQUIRE([AC_GNU_SOURCE])
+  dnl Persuade glibc and Solaris <time.h> to declare these functions.
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
   # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function.
   # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
@@ -16,11 +20,12 @@ AC_DEFUN([gl_CLOCK_TIME],
   # Save and restore LIBS so e.g., -lrt, isn't added to it.  Otherwise, *all*
   # programs in the package would end up linked with that potentially-shared
   # library, inducing unnecessary run-time overhead.
+  LIB_CLOCK_GETTIME=
+  AC_SUBST([LIB_CLOCK_GETTIME])
   gl_saved_libs=$LIBS
-    AC_SEARCH_LIBS(clock_gettime, [rt posix4],
+    AC_SEARCH_LIBS([clock_gettime], [rt posix4],
                    [test "$ac_cv_search_clock_gettime" = "none required" ||
                     LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
-    AC_SUBST(LIB_CLOCK_GETTIME)
-    AC_CHECK_FUNCS(clock_gettime clock_settime)
+    AC_CHECK_FUNCS([clock_gettime clock_settime])
   LIBS=$gl_saved_libs
 ])