| 1 | # Configure a more-standard replacement for <time.h>.
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| 2 |
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| 3 | # Copyright (C) 2000-2001, 2003-2007, 2009-2022 Free Software Foundation, Inc.
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| 4 |
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| 5 | # serial 20
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| 6 |
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| 7 | # This file is free software; the Free Software Foundation
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| 8 | # gives unlimited permission to copy and/or distribute it,
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| 9 | # with or without modifications, as long as this notice is preserved.
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| 10 |
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| 11 | # Written by Paul Eggert and Jim Meyering.
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| 12 |
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| 13 | AC_DEFUN_ONCE([gl_TIME_H],
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| 14 | [
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| 15 | dnl Ensure to expand the default settings once only, before all statements
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| 16 | dnl that occur in other macros.
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| 17 | AC_REQUIRE([gl_TIME_H_DEFAULTS])
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| 18 |
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| 19 | gl_NEXT_HEADERS([time.h])
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| 20 | AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
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| 21 |
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| 22 | dnl Check for declarations of anything we want to poison if the
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| 23 | dnl corresponding gnulib module is not in use.
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| 24 | gl_WARN_ON_USE_PREPARE([[
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| 25 | #include <time.h>
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| 26 | ]], [asctime_r ctime_r])
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| 27 |
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| 28 | AC_REQUIRE([AC_C_RESTRICT])
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| 29 |
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| 30 | AC_CACHE_CHECK([for TIME_UTC in <time.h>],
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| 31 | [gl_cv_time_h_has_TIME_UTC],
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| 32 | [AC_COMPILE_IFELSE(
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| 33 | [AC_LANG_PROGRAM(
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| 34 | [[#include <time.h>
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| 35 | ]],
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| 36 | [[static int x = TIME_UTC; x++;]])],
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| 37 | [gl_cv_time_h_has_TIME_UTC=yes],
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| 38 | [gl_cv_time_h_has_TIME_UTC=no])])
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| 39 | if test $gl_cv_time_h_has_TIME_UTC = yes; then
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| 40 | TIME_H_DEFINES_TIME_UTC=1
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| 41 | else
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| 42 | TIME_H_DEFINES_TIME_UTC=0
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| 43 | fi
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| 44 | AC_SUBST([TIME_H_DEFINES_TIME_UTC])
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| 45 | ])
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| 46 |
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| 47 | dnl Check whether 'struct timespec' is declared
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| 48 | dnl in time.h, sys/time.h, pthread.h, or unistd.h.
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| 49 |
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| 50 | AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
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| 51 | [
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| 52 | AC_CHECK_HEADERS_ONCE([sys/time.h])
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| 53 | AC_CACHE_CHECK([for struct timespec in <time.h>],
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| 54 | [gl_cv_sys_struct_timespec_in_time_h],
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| 55 | [AC_COMPILE_IFELSE(
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| 56 | [AC_LANG_PROGRAM(
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| 57 | [[#include <time.h>
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| 58 | ]],
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| 59 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
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| 60 | [gl_cv_sys_struct_timespec_in_time_h=yes],
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| 61 | [gl_cv_sys_struct_timespec_in_time_h=no])])
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| 62 |
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| 63 | TIME_H_DEFINES_STRUCT_TIMESPEC=0
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| 64 | SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
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| 65 | PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
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| 66 | UNISTD_H_DEFINES_STRUCT_TIMESPEC=0
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| 67 | if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
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| 68 | TIME_H_DEFINES_STRUCT_TIMESPEC=1
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| 69 | else
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| 70 | AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
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| 71 | [gl_cv_sys_struct_timespec_in_sys_time_h],
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| 72 | [AC_COMPILE_IFELSE(
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| 73 | [AC_LANG_PROGRAM(
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| 74 | [[#include <sys/time.h>
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| 75 | ]],
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| 76 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
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| 77 | [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
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| 78 | [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
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| 79 | if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
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| 80 | SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
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| 81 | else
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| 82 | AC_CACHE_CHECK([for struct timespec in <pthread.h>],
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| 83 | [gl_cv_sys_struct_timespec_in_pthread_h],
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| 84 | [AC_COMPILE_IFELSE(
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| 85 | [AC_LANG_PROGRAM(
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| 86 | [[#include <pthread.h>
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| 87 | ]],
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| 88 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
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| 89 | [gl_cv_sys_struct_timespec_in_pthread_h=yes],
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| 90 | [gl_cv_sys_struct_timespec_in_pthread_h=no])])
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| 91 | if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
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| 92 | PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
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| 93 | else
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| 94 | AC_CACHE_CHECK([for struct timespec in <unistd.h>],
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| 95 | [gl_cv_sys_struct_timespec_in_unistd_h],
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| 96 | [AC_COMPILE_IFELSE(
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| 97 | [AC_LANG_PROGRAM(
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| 98 | [[#include <unistd.h>
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| 99 | ]],
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| 100 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
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| 101 | [gl_cv_sys_struct_timespec_in_unistd_h=yes],
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| 102 | [gl_cv_sys_struct_timespec_in_unistd_h=no])])
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| 103 | if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
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| 104 | UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
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| 105 | fi
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| 106 | fi
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| 107 | fi
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| 108 | fi
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| 109 | AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
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| 110 | AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
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| 111 | AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
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| 112 | AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
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| 113 | ])
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| 114 |
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| 115 | # gl_TIME_MODULE_INDICATOR([modulename])
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| 116 | # sets the shell variable that indicates the presence of the given module
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| 117 | # to a C preprocessor expression that will evaluate to 1.
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| 118 | # This macro invocation must not occur in macros that are AC_REQUIREd.
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| 119 | AC_DEFUN([gl_TIME_MODULE_INDICATOR],
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| 120 | [
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| 121 | dnl Ensure to expand the default settings once only.
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| 122 | gl_TIME_H_REQUIRE_DEFAULTS
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| 123 | gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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| 124 | dnl Define it also as a C macro, for the benefit of the unit tests.
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| 125 | gl_MODULE_INDICATOR_FOR_TESTS([$1])
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| 126 | ])
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| 127 |
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| 128 | # Initializes the default values for AC_SUBSTed shell variables.
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| 129 | # This macro must not be AC_REQUIREd. It must only be invoked, and only
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| 130 | # outside of macros or in macros that are not AC_REQUIREd.
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| 131 | AC_DEFUN([gl_TIME_H_REQUIRE_DEFAULTS],
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| 132 | [
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| 133 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS], [
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| 134 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CTIME])
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| 135 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKTIME])
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| 136 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOCALTIME])
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| 137 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NANOSLEEP])
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| 138 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRFTIME])
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| 139 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRPTIME])
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| 140 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMEGM])
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| 141 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GET])
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| 142 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GETRES])
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| 143 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_R])
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| 144 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_RZ])
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| 145 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TZSET])
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| 146 | dnl Support Microsoft deprecated alias function names by default.
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| 147 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_TZSET], [1])
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| 148 | ])
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| 149 | m4_require(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS])
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| 150 | AC_REQUIRE([gl_TIME_H_DEFAULTS])
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| 151 | ])
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| 152 |
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| 153 | AC_DEFUN([gl_TIME_H_DEFAULTS],
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| 154 | [
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| 155 | dnl Assume proper GNU behavior unless another module says otherwise.
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| 156 | HAVE_DECL_LOCALTIME_R=1; AC_SUBST([HAVE_DECL_LOCALTIME_R])
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| 157 | HAVE_NANOSLEEP=1; AC_SUBST([HAVE_NANOSLEEP])
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| 158 | HAVE_STRPTIME=1; AC_SUBST([HAVE_STRPTIME])
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| 159 | HAVE_TIMEGM=1; AC_SUBST([HAVE_TIMEGM])
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| 160 | HAVE_TIMESPEC_GET=1; AC_SUBST([HAVE_TIMESPEC_GET])
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| 161 | HAVE_TIMESPEC_GETRES=1; AC_SUBST([HAVE_TIMESPEC_GETRES])
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| 162 | dnl Even GNU libc does not have timezone_t yet.
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| 163 | HAVE_TIMEZONE_T=0; AC_SUBST([HAVE_TIMEZONE_T])
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| 164 | dnl If another module says to replace or to not replace, do that.
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| 165 | dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
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| 166 | dnl this lets maintainers check for portability.
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| 167 | REPLACE_CTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_CTIME])
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| 168 | REPLACE_LOCALTIME_R=GNULIB_PORTCHECK; AC_SUBST([REPLACE_LOCALTIME_R])
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| 169 | REPLACE_MKTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_MKTIME])
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| 170 | REPLACE_NANOSLEEP=GNULIB_PORTCHECK; AC_SUBST([REPLACE_NANOSLEEP])
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| 171 | REPLACE_STRFTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_STRFTIME])
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| 172 | REPLACE_TIMEGM=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TIMEGM])
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| 173 | REPLACE_TZSET=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TZSET])
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| 174 |
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| 175 | dnl Hack so that the time module doesn't depend on the sys_time module.
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| 176 | dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
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| 177 | : ${GNULIB_GETTIMEOFDAY=0}; AC_SUBST([GNULIB_GETTIMEOFDAY])
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| 178 | dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
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| 179 | dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
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| 180 | dnl is no longer a big deal.
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| 181 | REPLACE_GMTIME=0; AC_SUBST([REPLACE_GMTIME])
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| 182 | REPLACE_LOCALTIME=0; AC_SUBST([REPLACE_LOCALTIME])
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| 183 | ])
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