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annotate m4/gettimeofday.m4 @ 8057:d5ba49b9b586

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* m4/string_h.m4 (gl_STRING_MODULE_INDICATOR): Correct m4 usage bug. * modules/string (Makefile.am): Remove redundant replacement. * modules/regex (Depends-on): Add mempcpy.
author Eric Blake <ebb9@byu.net>
date Thu, 01 Feb 2007 05:01:17 +0000
parents d12a7f6db481
children 039bedae1345
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #serial 11
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2
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3 # Copyright (C) 2001, 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 dnl From Jim Meyering.
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9
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10 AC_DEFUN([gl_FUNC_GETTIMEOFDAY],
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11 [
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12 AC_REQUIRE([AC_C_RESTRICT])
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13 AC_REQUIRE([gl_HEADER_SYS_TIME_H])
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14 AC_CHECK_FUNCS_ONCE([gettimeofday])
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16 AC_CACHE_CHECK([for gettimeofday with POSIX signature],
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17 [gl_cv_func_gettimeofday_posix_signature],
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18 [AC_COMPILE_IFELSE(
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19 [AC_LANG_PROGRAM(
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20 [[#include <sys/time.h>
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21 struct timeval c;
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22 ]],
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23 [[
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24 int (*f) (struct timeval *restrict, void *restrict) = gettimeofday;
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25 int x = f (&c, 0);
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26 return !(x | c.tv_sec | c.tv_usec);
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27 ]])],
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28 [gl_cv_func_gettimeofday_posix_signature=yes],
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29 [gl_cv_func_gettimeofday_posix_signature=no])])
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30
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31 gl_FUNC_GETTIMEOFDAY_CLOBBER
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32
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33 if test $gl_cv_func_gettimeofday_posix_signature != yes; then
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34 GETTIMEOFDAY_REPLACEMENT=1
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35 SYS_TIME_H=sys/time.h
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36 if test $gl_cv_func_gettimeofday_clobber != yes; then
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37 AC_LIBOBJ(gettimeofday)
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38 gl_PREREQ_GETTIMEOFDAY
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39 fi
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40 fi
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41 ])
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42
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43
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44 dnl See if gettimeofday clobbers the static buffer that localtime uses
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45 dnl for its return value. The gettimeofday function from Mac OS X 10.0.4
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46 dnl (i.e., Darwin 1.3.7) has this problem.
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47 dnl
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48 dnl If it does, then arrange to use gettimeofday and localtime only via
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49 dnl the wrapper functions that work around the problem.
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50
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51 AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
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52 [
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53 AC_REQUIRE([gl_HEADER_SYS_TIME_H])
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54
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55 AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
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56 [gl_cv_func_gettimeofday_clobber],
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57 [AC_RUN_IFELSE(
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58 [AC_LANG_PROGRAM(
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59 [[#include <string.h>
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60 #include <sys/time.h>
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61 #include <time.h>
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62 #include <stdlib.h>
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63 ]],
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64 [[
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65 time_t t = 0;
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66 struct tm *lt;
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67 struct tm saved_lt;
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68 struct timeval tv;
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69 lt = localtime (&t);
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70 saved_lt = *lt;
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71 gettimeofday (&tv, NULL);
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72 return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
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73 ]])],
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74 [gl_cv_func_gettimeofday_clobber=no],
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75 [gl_cv_func_gettimeofday_clobber=yes],
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76 dnl When crosscompiling, assume it is broken.
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77 [gl_cv_func_gettimeofday_clobber=yes])])
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78
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79 if test $gl_cv_func_gettimeofday_clobber = yes; then
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80 GETTIMEOFDAY_REPLACEMENT=1
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81 SYS_TIME_H=sys/time.h
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82 gl_GETTIMEOFDAY_REPLACE_LOCALTIME
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83 AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], 1,
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84 [Define if gettimeofday clobbers the localtime buffer.])
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85 fi
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86 ])
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87
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88 AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
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89 AC_LIBOBJ(gettimeofday)
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90 gl_PREREQ_GETTIMEOFDAY
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91 AC_DEFINE([gmtime], [rpl_gmtime],
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92 [Define to rpl_gmtime if the replacement function should be used.])
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93 AC_DEFINE([localtime], [rpl_localtime],
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94 [Define to rpl_localtime if the replacement function should be used.])
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95 ])
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96
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97 # Prerequisites of lib/gettimeofday.c.
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98 AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
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99 AC_CHECK_HEADERS([sys/timeb.h])
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100 AC_CHECK_FUNCS([_ftime])
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101 ])