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annotate m4/gettimeofday.m4 @ 7901:1b1117096a35

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Undo the last change; it caused a compilation error when cross-compiling to Cygwin.
author Bruno Haible <bruno@clisp.org>
date Fri, 19 Jan 2007 01:50:55 +0000
parents 9a1885fa7afb
children 5fa14d8c0b45
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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9a1885fa7afb * m4/gettimeofday.m4 (gl_GETTIMEOFDAY_REPLACE_LOCALTIME): Also
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1 #serial 10
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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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15
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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 HAVE_GETTIMEOFDAY_POSIX_SIGNATURE=0
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35 if test $gl_cv_func_gettimeofday_clobber != yes; then
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36 AC_LIBOBJ(gettimeofday)
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37 gl_PREREQ_GETTIMEOFDAY
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38 fi
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39 fi
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40 ])
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41
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42
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43 dnl See if gettimeofday clobbers the static buffer that localtime uses
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44 dnl for its return value. The gettimeofday function from Mac OS X 10.0.4
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45 dnl (i.e., Darwin 1.3.7) has this problem.
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46 dnl
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47 dnl If it does, then arrange to use gettimeofday and localtime only via
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48 dnl the wrapper functions that work around the problem.
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49
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50 AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
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51 [
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52 AC_REQUIRE([gl_HEADER_SYS_TIME_H])
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53
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54 AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
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55 [gl_cv_func_gettimeofday_clobber],
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56 [AC_RUN_IFELSE(
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57 [AC_LANG_PROGRAM(
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58 [[#include <string.h>
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59 #include <sys/time.h>
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60 #include <time.h>
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61 #include <stdlib.h>
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62 ]],
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63 [[
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64 time_t t = 0;
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65 struct tm *lt;
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66 struct tm saved_lt;
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67 struct timeval tv;
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68 lt = localtime (&t);
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69 saved_lt = *lt;
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70 gettimeofday (&tv, NULL);
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71 return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
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72 ]])],
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73 [gl_cv_func_gettimeofday_clobber=no],
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74 [gl_cv_func_gettimeofday_clobber=yes],
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75 dnl When crosscompiling, assume it is broken.
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76 [gl_cv_func_gettimeofday_clobber=yes])])
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77
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78 if test $gl_cv_func_gettimeofday_clobber = yes; then
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79 gl_GETTIMEOFDAY_REPLACE_LOCALTIME
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80 GETTIMEOFDAY_CLOBBERS_LOCALTIME=1
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81 AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], 1,
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82 [Define if gettimeofday clobbers the localtime buffer.])
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83 fi
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84 ])
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85
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86 AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
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87 AC_LIBOBJ(gettimeofday)
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88 gl_PREREQ_GETTIMEOFDAY
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89 AC_DEFINE([gmtime], [rpl_gmtime],
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90 [Define to rpl_gmtime if the replacement function should be used.])
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91 AC_DEFINE([localtime], [rpl_localtime],
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92 [Define to rpl_localtime if the replacement function should be used.])
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93 ])
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94
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95 # Prerequisites of lib/gettimeofday.c.
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96 AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
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97 AC_CHECK_HEADERS([sys/timeb.h])
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98 AC_CHECK_FUNCS([_ftime])
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99 ])