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emacs/m4/time_h.m4
Po Lu 1a13c5e63e ; Update from Gnulib 
* configure.ac:

* src/conf_post.h: Remove workarounds now rendered redundant by
Gnulib.
2024-09-05 08:45:18 +08:00

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# time_h.m4
# serial 27
dnl Copyright (C) 2000-2001, 2003-2007, 2009-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Configure a more-standard replacement for <time.h>.
# Written by Paul Eggert and Jim Meyering.
AC_DEFUN_ONCE([gl_TIME_H],
[
dnl Ensure to expand the default settings once only, before all statements
dnl that occur in other macros.
AC_REQUIRE([gl_TIME_H_DEFAULTS])
gl_NEXT_HEADERS([time.h])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use.
gl_WARN_ON_USE_PREPARE([[
#include <time.h>
]], [
asctime asctime_r ctime ctime_r gmtime_r localtime localtime_r mktime
nanosleep strftime strptime time timegm timespec_get timespec_getres tzset
])
AC_REQUIRE([AC_C_RESTRICT])
AC_CACHE_CHECK([for TIME_UTC in <time.h>],
[gl_cv_time_h_has_TIME_UTC],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <time.h>
]],
[[static int x = TIME_UTC; x++;]])],
[gl_cv_time_h_has_TIME_UTC=yes],
[gl_cv_time_h_has_TIME_UTC=no])])
if test $gl_cv_time_h_has_TIME_UTC = yes; then
TIME_H_DEFINES_TIME_UTC=1
else
TIME_H_DEFINES_TIME_UTC=0
fi
AC_SUBST([TIME_H_DEFINES_TIME_UTC])
])
dnl Check whether 'struct timespec' is declared
dnl in time.h, sys/time.h, pthread.h, or unistd.h.
AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
[
AC_CHECK_HEADERS_ONCE([sys/time.h])
AC_CACHE_CHECK([for struct timespec in <time.h>],
[gl_cv_sys_struct_timespec_in_time_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <time.h>
]],
[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
[gl_cv_sys_struct_timespec_in_time_h=yes],
[gl_cv_sys_struct_timespec_in_time_h=no])])
TIME_H_DEFINES_STRUCT_TIMESPEC=0
SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
UNISTD_H_DEFINES_STRUCT_TIMESPEC=0
if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
TIME_H_DEFINES_STRUCT_TIMESPEC=1
else
AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
[gl_cv_sys_struct_timespec_in_sys_time_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/time.h>
]],
[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
[gl_cv_sys_struct_timespec_in_sys_time_h=yes],
[gl_cv_sys_struct_timespec_in_sys_time_h=no])])
if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
else
AC_CACHE_CHECK([for struct timespec in <pthread.h>],
[gl_cv_sys_struct_timespec_in_pthread_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <pthread.h>
]],
[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
[gl_cv_sys_struct_timespec_in_pthread_h=yes],
[gl_cv_sys_struct_timespec_in_pthread_h=no])])
if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
else
AC_CACHE_CHECK([for struct timespec in <unistd.h>],
[gl_cv_sys_struct_timespec_in_unistd_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <unistd.h>
]],
[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
[gl_cv_sys_struct_timespec_in_unistd_h=yes],
[gl_cv_sys_struct_timespec_in_unistd_h=no])])
if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
fi
fi
fi
fi
AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
])
# gl_TIME_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_TIME_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_TIME_H_REQUIRE_DEFAULTS
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
dnl Define it also as a C macro, for the benefit of the unit tests.
gl_MODULE_INDICATOR_FOR_TESTS([$1])
])
# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd. It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_TIME_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CTIME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MKTIME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LOCALTIME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_NANOSLEEP])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRFTIME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRPTIME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMEGM])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GET])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIMESPEC_GETRES])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_R])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TIME_RZ])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TZNAME])
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TZSET])
dnl Support Microsoft deprecated alias function names by default.
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_MDA_TZSET], [1])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_TIME_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_TIME_H_DEFAULTS])
])
AC_DEFUN([gl_TIME_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_DECL_LOCALTIME_R=1; AC_SUBST([HAVE_DECL_LOCALTIME_R])
HAVE_NANOSLEEP=1; AC_SUBST([HAVE_NANOSLEEP])
HAVE_STRPTIME=1; AC_SUBST([HAVE_STRPTIME])
HAVE_TIMEGM=1; AC_SUBST([HAVE_TIMEGM])
HAVE_TIMESPEC_GET=1; AC_SUBST([HAVE_TIMESPEC_GET])
HAVE_TIMESPEC_GETRES=1; AC_SUBST([HAVE_TIMESPEC_GETRES])
dnl Even GNU libc does not have timezone_t and tzalloc() yet.
HAVE_TIMEZONE_T=0; AC_SUBST([HAVE_TIMEZONE_T])
HAVE_TZALLOC=0; AC_SUBST([HAVE_TZALLOC])
REPLACE_CTIME=0; AC_SUBST([REPLACE_CTIME])
REPLACE_GMTIME=0; AC_SUBST([REPLACE_GMTIME])
REPLACE_LOCALTIME=0; AC_SUBST([REPLACE_LOCALTIME])
REPLACE_LOCALTIME_R=0; AC_SUBST([REPLACE_LOCALTIME_R])
REPLACE_LOCALTIME_RZ=0; AC_SUBST([REPLACE_LOCALTIME_RZ])
REPLACE_MKTIME=0; AC_SUBST([REPLACE_MKTIME])
REPLACE_MKTIME_Z=0; AC_SUBST([REPLACE_MKTIME_Z])
REPLACE_NANOSLEEP=0; AC_SUBST([REPLACE_NANOSLEEP])
REPLACE_STRFTIME=0; AC_SUBST([REPLACE_STRFTIME])
REPLACE_TIME=0; AC_SUBST([REPLACE_TIME])
REPLACE_TIMEGM=0; AC_SUBST([REPLACE_TIMEGM])
REPLACE_TIMESPEC_GET=0; AC_SUBST([REPLACE_TIMESPEC_GET])
REPLACE_TIMESPEC_GETRES=0; AC_SUBST([REPLACE_TIMESPEC_GETRES])
REPLACE_TZSET=0; AC_SUBST([REPLACE_TZSET])
])
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