# 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 . # 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 ]], [ 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 ], [gl_cv_time_h_has_TIME_UTC], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include ]], [[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 ], [gl_cv_sys_struct_timespec_in_time_h], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include ]], [[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 ], [gl_cv_sys_struct_timespec_in_sys_time_h], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include ]], [[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 ], [gl_cv_sys_struct_timespec_in_pthread_h], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include ]], [[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 ], [gl_cv_sys_struct_timespec_in_unistd_h], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include ]], [[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]) ])