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# clock_time.m4 serial 5
dnl Copyright (C) 2002, 2003, 2004 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.
AC_DEFUN([gl_CLOCK_TIME],
[
# dnl Persuade glibc <time.h> to declare these functions.
AC_REQUIRE([AC_GNU_SOURCE])
# 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.
fetish_saved_libs=$LIBS
AC_SEARCH_LIBS(clock_gettime, [rt posix4],
[test "$ac_cv_search_clock_gettime" = "none required" ||
LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
AC_SUBST(LIB_CLOCK_GETTIME)
AC_CHECK_FUNCS(clock_gettime clock_settime)
LIBS=$fetish_saved_libs
])
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