71 lines
2.4 KiB
Text
71 lines
2.4 KiB
Text
# gethrxtime.m4
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# serial 15
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dnl Copyright (C) 2005-2006, 2008-2025 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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dnl Written by Paul Eggert.
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AC_DEFUN([gl_GETHRXTIME],
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[
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AC_REQUIRE([gl_ARITHMETIC_HRTIME_T])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_XTIME])
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AC_CHECK_DECLS([gethrtime], [], [], [[#include <time.h>]])
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GETHRXTIME_LIB=
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if test $ac_cv_have_decl_gethrtime = no \
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|| test $gl_cv_arithmetic_hrtime_t = no; then
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dnl Find libraries needed to link lib/gethrxtime.c.
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AC_REQUIRE([gl_CLOCK_TIME])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_FUNCS_ONCE([microuptime nanouptime])
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if test $ac_cv_func_nanouptime != yes \
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&& { test $ac_cv_have_decl_gethrtime = no \
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|| test $gl_cv_arithmetic_hrtime_t = no; }; then
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AC_CACHE_CHECK([whether CLOCK_MONOTONIC or CLOCK_REALTIME is defined],
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[gl_cv_have_clock_gettime_macro],
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[AC_EGREP_CPP([have_clock_gettime_macro],
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[
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# include <time.h>
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# if defined CLOCK_MONOTONIC || defined CLOCK_REALTIME
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have_clock_gettime_macro
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# endif
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],
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[gl_cv_have_clock_gettime_macro=yes],
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[gl_cv_have_clock_gettime_macro=no])])
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if test $gl_cv_have_clock_gettime_macro = yes; then
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GETHRXTIME_LIB=$CLOCK_TIME_LIB
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fi
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fi
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fi
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AC_SUBST([GETHRXTIME_LIB])
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dnl For backward compatibility.
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LIB_GETHRXTIME="$GETHRXTIME_LIB"
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AC_SUBST([LIB_GETHRXTIME])
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])
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# Test whether hrtime_t is an arithmetic type.
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# It is not arithmetic in older Solaris c89 (which insists on
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# not having a long long int type).
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AC_DEFUN([gl_ARITHMETIC_HRTIME_T],
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[
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_CACHE_CHECK([for arithmetic hrtime_t], [gl_cv_arithmetic_hrtime_t],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[#include <time.h>]],
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[[hrtime_t x = 0; return x/x;]])],
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[gl_cv_arithmetic_hrtime_t=yes],
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[gl_cv_arithmetic_hrtime_t=no])])
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if test $gl_cv_arithmetic_hrtime_t = yes; then
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AC_DEFINE([HAVE_ARITHMETIC_HRTIME_T], [1],
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[Define if you have an arithmetic hrtime_t type.])
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fi
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])
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# Prerequisites of lib/xtime.h.
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AC_DEFUN([gl_XTIME],
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[
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:
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])
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