m4/time_h.m4

   1 # Configure a more-standard replacement for <time.h>.
   2
   3 # Copyright (C) 2000-2001, 2003-2007, 2009-2014 Free Software Foundation, Inc.
   4
   5 # serial 8
   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, or pthread.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   if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
  48     TIME_H_DEFINES_STRUCT_TIMESPEC=1
  49   else
  50     AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
  51       [gl_cv_sys_struct_timespec_in_sys_time_h],
  52       [AC_COMPILE_IFELSE(
  53          [AC_LANG_PROGRAM(
  54             [[#include <sys/time.h>
  55             ]],
  56             [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  57          [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
  58          [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
  59     if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
  60       SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
  61     else
  62       AC_CACHE_CHECK([for struct timespec in <pthread.h>],
  63         [gl_cv_sys_struct_timespec_in_pthread_h],
  64         [AC_COMPILE_IFELSE(
  65            [AC_LANG_PROGRAM(
  66               [[#include <pthread.h>
  67               ]],
  68               [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  69            [gl_cv_sys_struct_timespec_in_pthread_h=yes],
  70            [gl_cv_sys_struct_timespec_in_pthread_h=no])])
  71       if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
  72         PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
  73       fi
  74     fi
  75   fi
  76   AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
  77   AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
  78   AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
  79 ])
  80
  81 AC_DEFUN([gl_TIME_MODULE_INDICATOR],
  82 [
  83   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  84   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  85   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  86   dnl Define it also as a C macro, for the benefit of the unit tests.
  87   gl_MODULE_INDICATOR_FOR_TESTS([$1])
  88 ])
  89
  90 AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
  91 [
  92   GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
  93   GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
  94   GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
  95   GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
  96   GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
  97   dnl Assume proper GNU behavior unless another module says otherwise.
  98   HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
  99   HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
 100   HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
 101   HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
 102   dnl If another module says to replace or to not replace, do that.
 103   dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
 104   dnl this lets maintainers check for portability.
 105   REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
 106   REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
 107   REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
 108   REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
 109
 110   dnl Hack so that the time module doesn't depend on the sys_time module.
 111   dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
 112   : ${GNULIB_GETTIMEOFDAY=0};            AC_SUBST([GNULIB_GETTIMEOFDAY])
 113   dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
 114   dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
 115   dnl is no longer a big deal.
 116   REPLACE_GMTIME=0;                      AC_SUBST([REPLACE_GMTIME])
 117   REPLACE_LOCALTIME=0;                   AC_SUBST([REPLACE_LOCALTIME])
 118 ])