1# Configure a more-standard replacement for <time.h>.
2
3# Copyright (C) 2000-2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
4
5# serial 11
6
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.
10
11# Written by Paul Eggert and Jim Meyering.
12
13AC_DEFUN([gl_HEADER_TIME_H],
14[
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])
18])
19
20AC_DEFUN([gl_HEADER_TIME_H_BODY],
21[
22  AC_REQUIRE([AC_C_RESTRICT])
23  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
24  gl_NEXT_HEADERS([time.h])
25  AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
26])
27
28dnl Check whether 'struct timespec' is declared
29dnl in time.h, sys/time.h, pthread.h, or unistd.h.
30
31AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
32[
33  AC_CHECK_HEADERS_ONCE([sys/time.h])
34  AC_CACHE_CHECK([for struct timespec in <time.h>],
35    [gl_cv_sys_struct_timespec_in_time_h],
36    [AC_COMPILE_IFELSE(
37       [AC_LANG_PROGRAM(
38          [[#include <time.h>
39          ]],
40          [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
41       [gl_cv_sys_struct_timespec_in_time_h=yes],
42       [gl_cv_sys_struct_timespec_in_time_h=no])])
43
44  TIME_H_DEFINES_STRUCT_TIMESPEC=0
45  SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
46  PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
47  UNISTD_H_DEFINES_STRUCT_TIMESPEC=0
48  if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
49    TIME_H_DEFINES_STRUCT_TIMESPEC=1
50  else
51    AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
52      [gl_cv_sys_struct_timespec_in_sys_time_h],
53      [AC_COMPILE_IFELSE(
54         [AC_LANG_PROGRAM(
55            [[#include <sys/time.h>
56            ]],
57            [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
58         [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
59         [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
60    if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
61      SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
62    else
63      AC_CACHE_CHECK([for struct timespec in <pthread.h>],
64        [gl_cv_sys_struct_timespec_in_pthread_h],
65        [AC_COMPILE_IFELSE(
66           [AC_LANG_PROGRAM(
67              [[#include <pthread.h>
68              ]],
69              [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
70           [gl_cv_sys_struct_timespec_in_pthread_h=yes],
71           [gl_cv_sys_struct_timespec_in_pthread_h=no])])
72      if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
73        PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
74      else
75        AC_CACHE_CHECK([for struct timespec in <unistd.h>],
76          [gl_cv_sys_struct_timespec_in_unistd_h],
77          [AC_COMPILE_IFELSE(
78             [AC_LANG_PROGRAM(
79                [[#include <unistd.h>
80                ]],
81                [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
82             [gl_cv_sys_struct_timespec_in_unistd_h=yes],
83             [gl_cv_sys_struct_timespec_in_unistd_h=no])])
84        if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
85          UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
86        fi
87      fi
88    fi
89  fi
90  AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
91  AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
92  AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
93  AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
94])
95
96AC_DEFUN([gl_TIME_MODULE_INDICATOR],
97[
98  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
99  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
100  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
101  dnl Define it also as a C macro, for the benefit of the unit tests.
102  gl_MODULE_INDICATOR_FOR_TESTS([$1])
103])
104
105AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
106[
107  GNULIB_CTIME=0;                        AC_SUBST([GNULIB_CTIME])
108  GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
109  GNULIB_LOCALTIME=0;                    AC_SUBST([GNULIB_LOCALTIME])
110  GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
111  GNULIB_STRFTIME=0;                     AC_SUBST([GNULIB_STRFTIME])
112  GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
113  GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
114  GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
115  GNULIB_TIME_RZ=0;                      AC_SUBST([GNULIB_TIME_RZ])
116  GNULIB_TZSET=0;                        AC_SUBST([GNULIB_TZSET])
117  dnl Assume proper GNU behavior unless another module says otherwise.
118  HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
119  HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
120  HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
121  HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
122  HAVE_TZSET=1;                          AC_SUBST([HAVE_TZSET])
123  dnl Even GNU libc does not have timezone_t yet.
124  HAVE_TIMEZONE_T=0;                     AC_SUBST([HAVE_TIMEZONE_T])
125  dnl If another module says to replace or to not replace, do that.
126  dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
127  dnl this lets maintainers check for portability.
128  REPLACE_CTIME=GNULIB_PORTCHECK;        AC_SUBST([REPLACE_CTIME])
129  REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
130  REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
131  REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
132  REPLACE_STRFTIME=GNULIB_PORTCHECK;     AC_SUBST([REPLACE_STRFTIME])
133  REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
134  REPLACE_TZSET=GNULIB_PORTCHECK;        AC_SUBST([REPLACE_TZSET])
135
136  dnl Hack so that the time module doesn't depend on the sys_time module.
137  dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
138  : ${GNULIB_GETTIMEOFDAY=0};            AC_SUBST([GNULIB_GETTIMEOFDAY])
139  dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
140  dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
141  dnl is no longer a big deal.
142  REPLACE_GMTIME=0;                      AC_SUBST([REPLACE_GMTIME])
143  REPLACE_LOCALTIME=0;                   AC_SUBST([REPLACE_LOCALTIME])
144])
145