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annotate m4/sys_time_h.m4 @ 17440:0d0daceb5bdd

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nproc: relax license to LGPLv2+ nproc merely exposes alternatives to sysconf(_SC_NPROCESSORS_CONF), which is part of glibc and thus LGPLv2+; it is not adding any value that strategically requires LGPLv3+. See also this thread. https://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00105.html * modules/nproc (License): Change from LGPLv3+. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Wed, 03 Jul 2013 15:34:30 -0600
parents e542fd46ad6f
children
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1 # Configure a replacement for <sys/time.h>.
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2 # serial 8
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3
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4 # Copyright (C) 2007, 2009-2013 Free Software Foundation, Inc.
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5 # This file is free software; the Free Software Foundation
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6 # gives unlimited permission to copy and/or distribute it,
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7 # with or without modifications, as long as this notice is preserved.
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8
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9 # Written by Paul Eggert and Martin Lambers.
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10
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11 AC_DEFUN([gl_HEADER_SYS_TIME_H],
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12 [
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13 dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
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14 dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
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15 dnl statements that occur in other macros.
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16 AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
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17 ])
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18
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19 AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
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20 [
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21 AC_REQUIRE([AC_C_RESTRICT])
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22 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
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23 AC_CHECK_HEADERS_ONCE([sys/time.h])
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24 gl_CHECK_NEXT_HEADERS([sys/time.h])
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25
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26 if test $ac_cv_header_sys_time_h != yes; then
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27 HAVE_SYS_TIME_H=0
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28 fi
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29
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30 dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h>
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31 dnl only. So include that header in the list.
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32 gl_PREREQ_SYS_H_WINSOCK2
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33 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
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34 [AC_COMPILE_IFELSE(
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35 [AC_LANG_PROGRAM(
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36 [[#if HAVE_SYS_TIME_H
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37 #include <sys/time.h>
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38 #endif
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39 #include <time.h>
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40 #if HAVE_WINSOCK2_H
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41 # include <winsock2.h>
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42 #endif
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43 ]],
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44 [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
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45 [gl_cv_sys_struct_timeval=yes],
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46 [gl_cv_sys_struct_timeval=no])
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47 ])
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48 if test $gl_cv_sys_struct_timeval != yes; then
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49 HAVE_STRUCT_TIMEVAL=0
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50 else
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51 dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined
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52 dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only
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53 dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is
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54 dnl smaller than the 'time_t' type mandated by POSIX.
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55 dnl On OpenBSD 5.1 amd64, tv_sec is 64 bits and time_t 32 bits, but
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56 dnl that is good enough.
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57 AC_CACHE_CHECK([for wide-enough struct timeval.tv_sec member],
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58 [gl_cv_sys_struct_timeval_tv_sec],
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59 [AC_COMPILE_IFELSE(
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60 [AC_LANG_PROGRAM(
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61 [[#if HAVE_SYS_TIME_H
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62 #include <sys/time.h>
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63 #endif
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64 #include <time.h>
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65 #if HAVE_WINSOCK2_H
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66 # include <winsock2.h>
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67 #endif
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68 ]],
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69 [[static struct timeval x;
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70 typedef int verify_tv_sec_type[
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71 sizeof (time_t) <= sizeof x.tv_sec ? 1 : -1
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72 ];
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73 ]])],
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74 [gl_cv_sys_struct_timeval_tv_sec=yes],
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75 [gl_cv_sys_struct_timeval_tv_sec=no])
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76 ])
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77 if test $gl_cv_sys_struct_timeval_tv_sec != yes; then
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78 REPLACE_STRUCT_TIMEVAL=1
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79 fi
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80 fi
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81
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82 dnl Check for declarations of anything we want to poison if the
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83 dnl corresponding gnulib module is not in use.
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84 gl_WARN_ON_USE_PREPARE([[
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85 #if HAVE_SYS_TIME_H
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86 # include <sys/time.h>
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87 #endif
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88 #include <time.h>
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89 ]], [gettimeofday])
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90 ])
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91
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92 AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
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93 [
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94 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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95 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
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96 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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97 dnl Define it also as a C macro, for the benefit of the unit tests.
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98 gl_MODULE_INDICATOR_FOR_TESTS([$1])
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99 ])
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100
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101 AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
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102 [
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103 GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY])
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104 dnl Assume POSIX behavior unless another module says otherwise.
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105 HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY])
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106 HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL])
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107 HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H])
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108 REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY])
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109 REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL])
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110 ])