m4/time_h.m4

   1 # Configure a more-standard replacement for <time.h>.
   2
   3 # Copyright (C) 2000-2001, 2003-2007, 2009-2010 Free Software Foundation, Inc.
   4
   5 # This file is free software; the Free Software Foundation
   6 # gives unlimited permission to copy and/or distribute it,
   7 # with or without modifications, as long as this notice is preserved.
   8
   9 # Written by Paul Eggert and Jim Meyering.
  10
  11 AC_DEFUN([gl_HEADER_TIME_H],
  12 [
  13   dnl Use AC_REQUIRE here, so that the default behavior below is expanded
  14   dnl once only, before all statements that occur in other macros.
  15   AC_REQUIRE([gl_HEADER_TIME_H_BODY])
  16 ])
  17
  18 AC_DEFUN([gl_HEADER_TIME_H_BODY],
  19 [
  20   AC_REQUIRE([AC_C_RESTRICT])
  21   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  22   gl_CHECK_NEXT_HEADERS([time.h])
  23   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
  24 ])
  25
  26 dnl Define HAVE_STRUCT_TIMESPEC if `struct timespec' is declared
  27 dnl in time.h or sys/time.h.
  28
  29 AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
  30 [
  31   AC_CHECK_HEADERS_ONCE([sys/time.h])
  32   AC_CACHE_CHECK([for struct timespec in <time.h>],
  33     [gl_cv_sys_struct_timespec_in_time_h],
  34     [AC_COMPILE_IFELSE(
  35        [AC_LANG_PROGRAM(
  36           [[#include <time.h>
  37           ]],
  38           [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  39        [gl_cv_sys_struct_timespec_in_time_h=yes],
  40        [gl_cv_sys_struct_timespec_in_time_h=no])])
  41
  42   TIME_H_DEFINES_STRUCT_TIMESPEC=0
  43   SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
  44   if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
  45     TIME_H_DEFINES_STRUCT_TIMESPEC=1
  46   else
  47     AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
  48       [gl_cv_sys_struct_timespec_in_sys_time_h],
  49       [AC_COMPILE_IFELSE(
  50          [AC_LANG_PROGRAM(
  51             [[#include <sys/time.h>
  52             ]],
  53             [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  54          [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
  55          [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
  56     if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
  57       SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
  58     fi
  59   fi
  60   AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
  61   AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
  62 ])
  63
  64 AC_DEFUN([gl_TIME_MODULE_INDICATOR],
  65 [
  66   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  67   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  68   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  69   dnl Define it also as a C macro, for the benefit of the unit tests.
  70   gl_MODULE_INDICATOR_FOR_TESTS([$1])
  71 ])
  72
  73 AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
  74 [
  75   GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
  76   GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
  77   GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
  78   GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
  79   GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
  80   dnl Assume proper GNU behavior unless another module says otherwise.
  81   HAVE_LOCALTIME_R=1;                    AC_SUBST([HAVE_LOCALTIME_R])
  82   HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
  83   HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
  84   HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
  85   dnl If another module says to replace or to not replace, do that.
  86   dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
  87   dnl this lets maintainers check for portability.
  88   REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
  89   REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
  90   REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
  91   REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
  92 ])