1 # Configure a more-standard replacement for <time.h>.
3 # Copyright (C) 2000-2001, 2003-2007, 2009-2021 Free Software Foundation, Inc.
7 # This file is free software; the Free Software Foundation
8 # gives unlimited permission to copy and/or distribute it,
9 # with or without modifications, as long as this notice is preserved.
11 # Written by Paul Eggert and Jim Meyering.
13 AC_DEFUN([gl_HEADER_TIME_H],
15 dnl Use AC_REQUIRE here, so that the default behavior below is expanded
16 dnl once only, before all statements that occur in other macros.
17 AC_REQUIRE([gl_HEADER_TIME_H_BODY])
20 AC_DEFUN([gl_HEADER_TIME_H_BODY],
22 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
24 gl_NEXT_HEADERS([time.h])
25 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
27 AC_REQUIRE([AC_C_RESTRICT])
29 AC_CACHE_CHECK([for TIME_UTC in <time.h>],
30 [gl_cv_time_h_has_TIME_UTC],
35 [[static int x = TIME_UTC; x++;]])],
36 [gl_cv_time_h_has_TIME_UTC=yes],
37 [gl_cv_time_h_has_TIME_UTC=no])])
38 if test $gl_cv_time_h_has_TIME_UTC = yes; then
39 TIME_H_DEFINES_TIME_UTC=1
41 TIME_H_DEFINES_TIME_UTC=0
43 AC_SUBST([TIME_H_DEFINES_TIME_UTC])
46 dnl Check whether 'struct timespec' is declared
47 dnl in time.h, sys/time.h, pthread.h, or unistd.h.
49 AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
51 AC_CHECK_HEADERS_ONCE([sys/time.h])
52 AC_CACHE_CHECK([for struct timespec in <time.h>],
53 [gl_cv_sys_struct_timespec_in_time_h],
58 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
59 [gl_cv_sys_struct_timespec_in_time_h=yes],
60 [gl_cv_sys_struct_timespec_in_time_h=no])])
62 TIME_H_DEFINES_STRUCT_TIMESPEC=0
63 SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
64 PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
65 UNISTD_H_DEFINES_STRUCT_TIMESPEC=0
66 if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
67 TIME_H_DEFINES_STRUCT_TIMESPEC=1
69 AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
70 [gl_cv_sys_struct_timespec_in_sys_time_h],
73 [[#include <sys/time.h>
75 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
76 [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
77 [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
78 if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
79 SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
81 AC_CACHE_CHECK([for struct timespec in <pthread.h>],
82 [gl_cv_sys_struct_timespec_in_pthread_h],
85 [[#include <pthread.h>
87 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
88 [gl_cv_sys_struct_timespec_in_pthread_h=yes],
89 [gl_cv_sys_struct_timespec_in_pthread_h=no])])
90 if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
91 PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
93 AC_CACHE_CHECK([for struct timespec in <unistd.h>],
94 [gl_cv_sys_struct_timespec_in_unistd_h],
99 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
100 [gl_cv_sys_struct_timespec_in_unistd_h=yes],
101 [gl_cv_sys_struct_timespec_in_unistd_h=no])])
102 if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
103 UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
108 AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
109 AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
110 AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
111 AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
114 AC_DEFUN([gl_TIME_MODULE_INDICATOR],
116 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
117 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
118 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
119 dnl Define it also as a C macro, for the benefit of the unit tests.
120 gl_MODULE_INDICATOR_FOR_TESTS([$1])
123 AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
125 GNULIB_CTIME=0; AC_SUBST([GNULIB_CTIME])
126 GNULIB_MKTIME=0; AC_SUBST([GNULIB_MKTIME])
127 GNULIB_LOCALTIME=0; AC_SUBST([GNULIB_LOCALTIME])
128 GNULIB_NANOSLEEP=0; AC_SUBST([GNULIB_NANOSLEEP])
129 GNULIB_STRFTIME=0; AC_SUBST([GNULIB_STRFTIME])
130 GNULIB_STRPTIME=0; AC_SUBST([GNULIB_STRPTIME])
131 GNULIB_TIMEGM=0; AC_SUBST([GNULIB_TIMEGM])
132 GNULIB_TIMESPEC_GET=0; AC_SUBST([GNULIB_TIMESPEC_GET])
133 GNULIB_TIME_R=0; AC_SUBST([GNULIB_TIME_R])
134 GNULIB_TIME_RZ=0; AC_SUBST([GNULIB_TIME_RZ])
135 GNULIB_TZSET=0; AC_SUBST([GNULIB_TZSET])
136 dnl Support Microsoft deprecated alias function names by default.
137 GNULIB_MDA_TZSET=1; AC_SUBST([GNULIB_MDA_TZSET])
138 dnl Assume proper GNU behavior unless another module says otherwise.
139 HAVE_DECL_LOCALTIME_R=1; AC_SUBST([HAVE_DECL_LOCALTIME_R])
140 HAVE_NANOSLEEP=1; AC_SUBST([HAVE_NANOSLEEP])
141 HAVE_STRPTIME=1; AC_SUBST([HAVE_STRPTIME])
142 HAVE_TIMEGM=1; AC_SUBST([HAVE_TIMEGM])
143 HAVE_TIMESPEC_GET=1; AC_SUBST([HAVE_TIMESPEC_GET])
144 dnl Even GNU libc does not have timezone_t yet.
145 HAVE_TIMEZONE_T=0; AC_SUBST([HAVE_TIMEZONE_T])
146 dnl If another module says to replace or to not replace, do that.
147 dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
148 dnl this lets maintainers check for portability.
149 REPLACE_CTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_CTIME])
150 REPLACE_LOCALTIME_R=GNULIB_PORTCHECK; AC_SUBST([REPLACE_LOCALTIME_R])
151 REPLACE_MKTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_MKTIME])
152 REPLACE_NANOSLEEP=GNULIB_PORTCHECK; AC_SUBST([REPLACE_NANOSLEEP])
153 REPLACE_STRFTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_STRFTIME])
154 REPLACE_TIMEGM=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TIMEGM])
155 REPLACE_TZSET=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TZSET])
157 dnl Hack so that the time module doesn't depend on the sys_time module.
158 dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
159 : ${GNULIB_GETTIMEOFDAY=0}; AC_SUBST([GNULIB_GETTIMEOFDAY])
160 dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
161 dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
162 dnl is no longer a big deal.
163 REPLACE_GMTIME=0; AC_SUBST([REPLACE_GMTIME])
164 REPLACE_LOCALTIME=0; AC_SUBST([REPLACE_LOCALTIME])