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+# clock_time.m4 serial 11
+dnl Copyright (C) 2002-2006, 2009-2022 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_getres, 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) $(LIB_CLOCK_GETTIME)
+
+AC_DEFUN([gl_CLOCK_TIME],
+[
+ dnl Persuade glibc and Solaris <time.h> to declare these functions.
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function.
+ # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
+
+ # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all*
+ # programs in the package would end up linked with that potentially-shared
+ # library, inducing unnecessary run-time overhead.
+ LIB_CLOCK_GETTIME=
+ AC_SUBST([LIB_CLOCK_GETTIME])
+ gl_saved_libs=$LIBS
+ AC_SEARCH_LIBS([clock_gettime], [rt posix4],
+ [test "$ac_cv_search_clock_gettime" = "none required" ||
+ LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
+ AC_CHECK_FUNCS([clock_getres clock_gettime clock_settime])
+ LIBS=$gl_saved_libs
+])