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09607c9e TT |
1 | # Configure a more-standard replacement for <time.h>. |
2 | ||
dc6c21da | 3 | # Copyright (C) 2000-2001, 2003-2007, 2009-2022 Free Software Foundation, Inc. |
09607c9e | 4 | |
dc6c21da | 5 | # serial 19 |
09607c9e TT |
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 | ||
dc6c21da | 13 | AC_DEFUN_ONCE([gl_TIME_H], |
09607c9e | 14 | [ |
dc6c21da TT |
15 | dnl Ensure to expand the default settings once only, before all statements |
16 | dnl that occur in other macros. | |
17 | AC_REQUIRE([gl_TIME_H_DEFAULTS]) | |
698be2d8 | 18 | |
09607c9e TT |
19 | gl_NEXT_HEADERS([time.h]) |
20 | AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC]) | |
698be2d8 CB |
21 | |
22 | AC_REQUIRE([AC_C_RESTRICT]) | |
9c9d63b1 PM |
23 | |
24 | AC_CACHE_CHECK([for TIME_UTC in <time.h>], | |
25 | [gl_cv_time_h_has_TIME_UTC], | |
26 | [AC_COMPILE_IFELSE( | |
27 | [AC_LANG_PROGRAM( | |
28 | [[#include <time.h> | |
29 | ]], | |
30 | [[static int x = TIME_UTC; x++;]])], | |
31 | [gl_cv_time_h_has_TIME_UTC=yes], | |
32 | [gl_cv_time_h_has_TIME_UTC=no])]) | |
33 | if test $gl_cv_time_h_has_TIME_UTC = yes; then | |
34 | TIME_H_DEFINES_TIME_UTC=1 | |
35 | else | |
36 | TIME_H_DEFINES_TIME_UTC=0 | |
37 | fi | |
38 | AC_SUBST([TIME_H_DEFINES_TIME_UTC]) | |
09607c9e TT |
39 | ]) |
40 | ||
41 | dnl Check whether 'struct timespec' is declared | |
4a626d0a | 42 | dnl in time.h, sys/time.h, pthread.h, or unistd.h. |
09607c9e TT |
43 | |
44 | AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC], | |
45 | [ | |
46 | AC_CHECK_HEADERS_ONCE([sys/time.h]) | |
47 | AC_CACHE_CHECK([for struct timespec in <time.h>], | |
48 | [gl_cv_sys_struct_timespec_in_time_h], | |
49 | [AC_COMPILE_IFELSE( | |
50 | [AC_LANG_PROGRAM( | |
51 | [[#include <time.h> | |
52 | ]], | |
53 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])], | |
54 | [gl_cv_sys_struct_timespec_in_time_h=yes], | |
55 | [gl_cv_sys_struct_timespec_in_time_h=no])]) | |
56 | ||
57 | TIME_H_DEFINES_STRUCT_TIMESPEC=0 | |
58 | SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0 | |
59 | PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0 | |
4a626d0a | 60 | UNISTD_H_DEFINES_STRUCT_TIMESPEC=0 |
09607c9e TT |
61 | if test $gl_cv_sys_struct_timespec_in_time_h = yes; then |
62 | TIME_H_DEFINES_STRUCT_TIMESPEC=1 | |
63 | else | |
64 | AC_CACHE_CHECK([for struct timespec in <sys/time.h>], | |
65 | [gl_cv_sys_struct_timespec_in_sys_time_h], | |
66 | [AC_COMPILE_IFELSE( | |
67 | [AC_LANG_PROGRAM( | |
68 | [[#include <sys/time.h> | |
69 | ]], | |
70 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])], | |
71 | [gl_cv_sys_struct_timespec_in_sys_time_h=yes], | |
72 | [gl_cv_sys_struct_timespec_in_sys_time_h=no])]) | |
73 | if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then | |
74 | SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1 | |
75 | else | |
76 | AC_CACHE_CHECK([for struct timespec in <pthread.h>], | |
77 | [gl_cv_sys_struct_timespec_in_pthread_h], | |
78 | [AC_COMPILE_IFELSE( | |
79 | [AC_LANG_PROGRAM( | |
80 | [[#include <pthread.h> | |
81 | ]], | |
82 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])], | |
83 | [gl_cv_sys_struct_timespec_in_pthread_h=yes], | |
84 | [gl_cv_sys_struct_timespec_in_pthread_h=no])]) | |
85 | if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then | |
86 | PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1 | |
4a626d0a PA |
87 | else |
88 | AC_CACHE_CHECK([for struct timespec in <unistd.h>], | |
89 | [gl_cv_sys_struct_timespec_in_unistd_h], | |
90 | [AC_COMPILE_IFELSE( | |
91 | [AC_LANG_PROGRAM( | |
92 | [[#include <unistd.h> | |
93 | ]], | |
94 | [[static struct timespec x; x.tv_sec = x.tv_nsec;]])], | |
95 | [gl_cv_sys_struct_timespec_in_unistd_h=yes], | |
96 | [gl_cv_sys_struct_timespec_in_unistd_h=no])]) | |
97 | if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then | |
98 | UNISTD_H_DEFINES_STRUCT_TIMESPEC=1 | |
99 | fi | |
09607c9e TT |
100 | fi |
101 | fi | |
102 | fi | |
103 | AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC]) | |
104 | AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC]) | |
105 | AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC]) | |
4a626d0a | 106 | AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC]) |
09607c9e TT |
107 | ]) |
108 | ||
dc6c21da TT |
109 | # gl_TIME_MODULE_INDICATOR([modulename]) |
110 | # sets the shell variable that indicates the presence of the given module | |
111 | # to a C preprocessor expression that will evaluate to 1. | |
112 | # This macro invocation must not occur in macros that are AC_REQUIREd. | |
09607c9e TT |
113 | AC_DEFUN([gl_TIME_MODULE_INDICATOR], |
114 | [ | |
dc6c21da TT |
115 | dnl Ensure to expand the default settings once only. |
116 | gl_TIME_H_REQUIRE_DEFAULTS | |
09607c9e TT |
117 | gl_MODULE_INDICATOR_SET_VARIABLE([$1]) |
118 | dnl Define it also as a C macro, for the benefit of the unit tests. | |
119 | gl_MODULE_INDICATOR_FOR_TESTS([$1]) | |
120 | ]) | |
121 | ||
dc6c21da TT |
122 | # Initializes the default values for AC_SUBSTed shell variables. |
123 | # This macro must not be AC_REQUIREd. It must only be invoked, and only | |
124 | # outside of macros or in macros that are not AC_REQUIREd. | |
125 | AC_DEFUN([gl_TIME_H_REQUIRE_DEFAULTS], | |
126 | [ | |
127 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS], [ | |
128 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CTIME]) | |
129 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKTIME]) | |
130 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOCALTIME]) | |
131 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NANOSLEEP]) | |
132 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRFTIME]) | |
133 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRPTIME]) | |
134 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMEGM]) | |
135 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GET]) | |
136 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GETRES]) | |
137 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_R]) | |
138 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_RZ]) | |
139 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TZSET]) | |
140 | dnl Support Microsoft deprecated alias function names by default. | |
141 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_TZSET], [1]) | |
142 | ]) | |
143 | m4_require(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS]) | |
144 | AC_REQUIRE([gl_TIME_H_DEFAULTS]) | |
145 | ]) | |
146 | ||
147 | AC_DEFUN([gl_TIME_H_DEFAULTS], | |
09607c9e | 148 | [ |
09607c9e TT |
149 | dnl Assume proper GNU behavior unless another module says otherwise. |
150 | HAVE_DECL_LOCALTIME_R=1; AC_SUBST([HAVE_DECL_LOCALTIME_R]) | |
151 | HAVE_NANOSLEEP=1; AC_SUBST([HAVE_NANOSLEEP]) | |
152 | HAVE_STRPTIME=1; AC_SUBST([HAVE_STRPTIME]) | |
153 | HAVE_TIMEGM=1; AC_SUBST([HAVE_TIMEGM]) | |
9c9d63b1 | 154 | HAVE_TIMESPEC_GET=1; AC_SUBST([HAVE_TIMESPEC_GET]) |
dc6c21da | 155 | HAVE_TIMESPEC_GETRES=1; AC_SUBST([HAVE_TIMESPEC_GETRES]) |
c0c3707f CB |
156 | dnl Even GNU libc does not have timezone_t yet. |
157 | HAVE_TIMEZONE_T=0; AC_SUBST([HAVE_TIMEZONE_T]) | |
09607c9e TT |
158 | dnl If another module says to replace or to not replace, do that. |
159 | dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK; | |
160 | dnl this lets maintainers check for portability. | |
c0c3707f | 161 | REPLACE_CTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_CTIME]) |
09607c9e TT |
162 | REPLACE_LOCALTIME_R=GNULIB_PORTCHECK; AC_SUBST([REPLACE_LOCALTIME_R]) |
163 | REPLACE_MKTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_MKTIME]) | |
164 | REPLACE_NANOSLEEP=GNULIB_PORTCHECK; AC_SUBST([REPLACE_NANOSLEEP]) | |
c0c3707f | 165 | REPLACE_STRFTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_STRFTIME]) |
09607c9e | 166 | REPLACE_TIMEGM=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TIMEGM]) |
c0c3707f | 167 | REPLACE_TZSET=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TZSET]) |
4a626d0a PA |
168 | |
169 | dnl Hack so that the time module doesn't depend on the sys_time module. | |
170 | dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent. | |
171 | : ${GNULIB_GETTIMEOFDAY=0}; AC_SUBST([GNULIB_GETTIMEOFDAY]) | |
172 | dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME | |
173 | dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier | |
174 | dnl is no longer a big deal. | |
175 | REPLACE_GMTIME=0; AC_SUBST([REPLACE_GMTIME]) | |
176 | REPLACE_LOCALTIME=0; AC_SUBST([REPLACE_LOCALTIME]) | |
09607c9e | 177 | ]) |