code.delx.au - gnu-emacs/blob - m4/time_h.m4

   1 # Configure a more-standard replacement for <time.h>.
   2
   3 # Copyright (C) 2000-2001, 2003-2007, 2009-2015 Free Software
   4 # Foundation, Inc.
   5
   6 # serial 8
   7
   8 # This file is free software; the Free Software Foundation
   9 # gives unlimited permission to copy and/or distribute it,
  10 # with or without modifications, as long as this notice is preserved.
  11
  12 # Written by Paul Eggert and Jim Meyering.
  13
  14 AC_DEFUN([gl_HEADER_TIME_H],
  15 [
  16   dnl Use AC_REQUIRE here, so that the default behavior below is expanded
  17   dnl once only, before all statements that occur in other macros.
  18   AC_REQUIRE([gl_HEADER_TIME_H_BODY])
  19 ])
  20
  21 AC_DEFUN([gl_HEADER_TIME_H_BODY],
  22 [
  23   AC_REQUIRE([AC_C_RESTRICT])
  24   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  25   gl_NEXT_HEADERS([time.h])
  26   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
  27 ])
  28
  29 dnl Check whether 'struct timespec' is declared
  30 dnl in time.h, sys/time.h, or pthread.h.
  31
  32 AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
  33 [
  34   AC_CHECK_HEADERS_ONCE([sys/time.h])
  35   AC_CACHE_CHECK([for struct timespec in <time.h>],
  36     [gl_cv_sys_struct_timespec_in_time_h],
  37     [AC_COMPILE_IFELSE(
  38        [AC_LANG_PROGRAM(
  39           [[#include <time.h>
  40           ]],
  41           [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  42        [gl_cv_sys_struct_timespec_in_time_h=yes],
  43        [gl_cv_sys_struct_timespec_in_time_h=no])])
  44
  45   TIME_H_DEFINES_STRUCT_TIMESPEC=0
  46   SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
  47   PTHREAD_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       fi
  75     fi
  76   fi
  77   AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
  78   AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
  79   AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
  80 ])
  81
  82 AC_DEFUN([gl_TIME_MODULE_INDICATOR],
  83 [
  84   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  85   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  86   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  87   dnl Define it also as a C macro, for the benefit of the unit tests.
  88   gl_MODULE_INDICATOR_FOR_TESTS([$1])
  89 ])
  90
  91 AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
  92 [
  93   GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
  94   GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
  95   GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
  96   GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
  97   GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
  98   dnl Assume proper GNU behavior unless another module says otherwise.
  99   HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
 100   HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
 101   HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
 102   HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
 103   dnl If another module says to replace or to not replace, do that.
 104   dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
 105   dnl this lets maintainers check for portability.
 106   REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
 107   REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
 108   REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
 109   REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
 110
 111   dnl Hack so that the time module doesn't depend on the sys_time module.
 112   dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
 113   : ${GNULIB_GETTIMEOFDAY=0};            AC_SUBST([GNULIB_GETTIMEOFDAY])
 114   dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
 115   dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
 116   dnl is no longer a big deal.
 117   REPLACE_GMTIME=0;                      AC_SUBST([REPLACE_GMTIME])
 118   REPLACE_LOCALTIME=0;                   AC_SUBST([REPLACE_LOCALTIME])
 119 ])