1# Configure a more-standard replacement for <time.h>.
2
3# Copyright (C) 2000-2001, 2003-2007, 2009-2020 Free Software Foundation, Inc.
4
5# serial 12
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([gl_HEADER_TIME_H_DEFAULTS])
23
24  gl_NEXT_HEADERS([time.h])
25  AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
26
27  AC_REQUIRE([AC_C_RESTRICT])
28])
29
30dnl Check whether 'struct timespec' is declared
31dnl in time.h, sys/time.h, pthread.h, or unistd.h.
32
33AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
34[
35  AC_CHECK_HEADERS_ONCE([sys/time.h])
36  AC_CACHE_CHECK([for struct timespec in <time.h>],
37    [gl_cv_sys_struct_timespec_in_time_h],
38    [AC_COMPILE_IFELSE(
39       [AC_LANG_PROGRAM(
40          [[#include <time.h>
41          ]],
42          [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
43       [gl_cv_sys_struct_timespec_in_time_h=yes],
44       [gl_cv_sys_struct_timespec_in_time_h=no])])
45
46  TIME_H_DEFINES_STRUCT_TIMESPEC=0
47  SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
48  PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
49  UNISTD_H_DEFINES_STRUCT_TIMESPEC=0
50  if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
51    TIME_H_DEFINES_STRUCT_TIMESPEC=1
52  else
53    AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
54      [gl_cv_sys_struct_timespec_in_sys_time_h],
55      [AC_COMPILE_IFELSE(
56         [AC_LANG_PROGRAM(
57            [[#include <sys/time.h>
58            ]],
59            [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
60         [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
61         [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
62    if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
63      SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
64    else
65      AC_CACHE_CHECK([for struct timespec in <pthread.h>],
66        [gl_cv_sys_struct_timespec_in_pthread_h],
67        [AC_COMPILE_IFELSE(
68           [AC_LANG_PROGRAM(
69              [[#include <pthread.h>
70              ]],
71              [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
72           [gl_cv_sys_struct_timespec_in_pthread_h=yes],
73           [gl_cv_sys_struct_timespec_in_pthread_h=no])])
74      if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
75        PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
76      else
77        AC_CACHE_CHECK([for struct timespec in <unistd.h>],
78          [gl_cv_sys_struct_timespec_in_unistd_h],
79          [AC_COMPILE_IFELSE(
80             [AC_LANG_PROGRAM(
81                [[#include <unistd.h>
82                ]],
83                [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
84             [gl_cv_sys_struct_timespec_in_unistd_h=yes],
85             [gl_cv_sys_struct_timespec_in_unistd_h=no])])
86        if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
87          UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
88        fi
89      fi
90    fi
91  fi
92  AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
93  AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
94  AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
95  AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
96])
97
98AC_DEFUN([gl_TIME_MODULE_INDICATOR],
99[
100  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
101  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
102  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
103  dnl Define it also as a C macro, for the benefit of the unit tests.
104  gl_MODULE_INDICATOR_FOR_TESTS([$1])
105])
106
107AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
108[
109  GNULIB_CTIME=0;                        AC_SUBST([GNULIB_CTIME])
110  GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
111  GNULIB_LOCALTIME=0;                    AC_SUBST([GNULIB_LOCALTIME])
112  GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
113  GNULIB_STRFTIME=0;                     AC_SUBST([GNULIB_STRFTIME])
114  GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
115  GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
116  GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
117  GNULIB_TIME_RZ=0;                      AC_SUBST([GNULIB_TIME_RZ])
118  GNULIB_TZSET=0;                        AC_SUBST([GNULIB_TZSET])
119  dnl Assume proper GNU behavior unless another module says otherwise.
120  HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
121  HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
122  HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
123  HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
124  dnl Even GNU libc does not have timezone_t yet.
125  HAVE_TIMEZONE_T=0;                     AC_SUBST([HAVE_TIMEZONE_T])
126  dnl If another module says to replace or to not replace, do that.
127  dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
128  dnl this lets maintainers check for portability.
129  REPLACE_CTIME=GNULIB_PORTCHECK;        AC_SUBST([REPLACE_CTIME])
130  REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
131  REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
132  REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
133  REPLACE_STRFTIME=GNULIB_PORTCHECK;     AC_SUBST([REPLACE_STRFTIME])
134  REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
135  REPLACE_TZSET=GNULIB_PORTCHECK;        AC_SUBST([REPLACE_TZSET])
136
137  dnl Hack so that the time module doesn't depend on the sys_time module.
138  dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
139  : ${GNULIB_GETTIMEOFDAY=0};            AC_SUBST([GNULIB_GETTIMEOFDAY])
140  dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
141  dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
142  dnl is no longer a big deal.
143  REPLACE_GMTIME=0;                      AC_SUBST([REPLACE_GMTIME])
144  REPLACE_LOCALTIME=0;                   AC_SUBST([REPLACE_LOCALTIME])
145])
146