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# gethrxtime.m4 serial 13
dnl Copyright (C) 2005-2006, 2008-2020 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.
dnl Written by Paul Eggert.
AC_DEFUN([gl_GETHRXTIME],
[
AC_REQUIRE([gl_ARITHMETIC_HRTIME_T])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_XTIME])
AC_CHECK_DECLS([gethrtime], [], [], [[#include <time.h>]])
LIB_GETHRXTIME=
if test $ac_cv_have_decl_gethrtime = no \
|| test $gl_cv_arithmetic_hrtime_t = no; then
dnl Find libraries needed to link lib/gethrxtime.c.
AC_REQUIRE([gl_CLOCK_TIME])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([microuptime nanouptime])
if test $ac_cv_func_nanouptime != yes \
&& { test $ac_cv_have_decl_gethrtime = no \
|| test $gl_cv_arithmetic_hrtime_t = no; }; then
AC_CACHE_CHECK([whether CLOCK_MONOTONIC or CLOCK_REALTIME is defined],
[gl_cv_have_clock_gettime_macro],
[AC_EGREP_CPP([have_clock_gettime_macro],
[
# include <time.h>
# if defined CLOCK_MONOTONIC || defined CLOCK_REALTIME
have_clock_gettime_macro
# endif
],
[gl_cv_have_clock_gettime_macro=yes],
[gl_cv_have_clock_gettime_macro=no])])
if test $gl_cv_have_clock_gettime_macro = yes; then
LIB_GETHRXTIME=$LIB_CLOCK_GETTIME
fi
fi
fi
AC_SUBST([LIB_GETHRXTIME])
])
# Test whether hrtime_t is an arithmetic type.
# It is not arithmetic in older Solaris c89 (which insists on
# not having a long long int type).
AC_DEFUN([gl_ARITHMETIC_HRTIME_T],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CACHE_CHECK([for arithmetic hrtime_t], [gl_cv_arithmetic_hrtime_t],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <time.h>]],
[[hrtime_t x = 0; return x/x;]])],
[gl_cv_arithmetic_hrtime_t=yes],
[gl_cv_arithmetic_hrtime_t=no])])
if test $gl_cv_arithmetic_hrtime_t = yes; then
AC_DEFINE([HAVE_ARITHMETIC_HRTIME_T], [1],
[Define if you have an arithmetic hrtime_t type.])
fi
])
# Prerequisites of lib/xtime.h.
AC_DEFUN([gl_XTIME],
[
:
])
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