m4/timespec.m4

   1 # Configure checks for struct timespec
   2
   3 # Copyright (C) 2000-2001, 2003-2007, 2009-2011, 2012 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 # Original written by Paul Eggert and Jim Meyering.
  10 # Modified by Chet Ramey for bash
  11
  12 dnl Define HAVE_STRUCT_TIMESPEC if `struct timespec' is declared
  13 dnl in time.h, sys/time.h, or pthread.h.
  14
  15 AC_DEFUN([BASH_CHECK_TYPE_STRUCT_TIMESPEC],
  16 [
  17   AC_CHECK_HEADERS_ONCE([sys/time.h])
  18   AC_CACHE_CHECK([for struct timespec in <time.h>],
  19     [bash_cv_sys_struct_timespec_in_time_h],
  20     [AC_COMPILE_IFELSE(
  21        [AC_LANG_PROGRAM(
  22           [[#include <time.h>
  23           ]],
  24           [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  25        [bash_cv_sys_struct_timespec_in_time_h=yes],
  26        [bash_cv_sys_struct_timespec_in_time_h=no])])
  27
  28   HAVE_STRUCT_TIMESPEC=0
  29   TIME_H_DEFINES_STRUCT_TIMESPEC=0
  30   SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
  31   PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
  32   if test $bash_cv_sys_struct_timespec_in_time_h = yes; then
  33     AC_DEFINE([HAVE_STRUCT_TIMESPEC])
  34     AC_DEFINE([TIME_H_DEFINES_STRUCT_TIMESPEC])
  35     TIME_H_DEFINES_STRUCT_TIMESPEC=1
  36   else
  37     AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
  38       [bash_cv_sys_struct_timespec_in_sys_time_h],
  39       [AC_COMPILE_IFELSE(
  40          [AC_LANG_PROGRAM(
  41             [[#include <sys/time.h>
  42             ]],
  43             [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  44          [bash_cv_sys_struct_timespec_in_sys_time_h=yes],
  45          [bash_cv_sys_struct_timespec_in_sys_time_h=no])])
  46     if test $bash_cv_sys_struct_timespec_in_sys_time_h = yes; then
  47       SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
  48       AC_DEFINE([HAVE_STRUCT_TIMESPEC])
  49       AC_DEFINE([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
  50     else
  51       AC_CACHE_CHECK([for struct timespec in <pthread.h>],
  52         [bash_cv_sys_struct_timespec_in_pthread_h],
  53         [AC_COMPILE_IFELSE(
  54            [AC_LANG_PROGRAM(
  55               [[#include <pthread.h>
  56               ]],
  57               [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
  58            [bash_cv_sys_struct_timespec_in_pthread_h=yes],
  59            [bash_cv_sys_struct_timespec_in_pthread_h=no])])
  60       if test $bash_cv_sys_struct_timespec_in_pthread_h = yes; then
  61         PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
  62         AC_DEFINE([HAVE_STRUCT_TIMESPEC])
  63         AC_DEFINE([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
  64       fi
  65     fi
  66   fi
  67   AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
  68   AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
  69   AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
  70
  71 ])