gnulib/import/m4/time_h.m4

   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
  13 AC_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
  20 AC_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
  28 dnl Check whether 'struct timespec' is declared
  29 dnl in time.h, sys/time.h, pthread.h, or unistd.h.
  30
  31 AC_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
  96 AC_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
 105 AC_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 ])