source: trunk/m4/nanosleep.m4 @ 704

# Copyright (C) 2005-2008 David Carter <arm4@arm4.org>
#  
# This file is free software; as a special exception the author gives
# unlimited permission to copy and/or distribute it, with or without 
# modifications, as long as this notice is preserved.
# 
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# Macros to check the link flags for the nanosleep function

AC_DEFUN([__ARM4_NANOSLEEP_CHECKLINK],
[
  NANOSLEEP_LIBS="$1"
  ac_save_LIBS="$LIBS"
  LIBS="$LIBS $NANOSLEEP_LIBS"
  AC_LINK_IFELSE([
#include <time.h>

main ()
{
    struct timespec request;
    nanosleep (&request, (struct timespec *)0);
}
], ,[NANOSLEEP_LIBS="fail"])
  LIBS="$ac_save_libs"
  AC_SUBST(NANOSLEEP_LIBS)
])

AC_DEFUN([ARM4_CHECK_NANOSLEEP],
[
  AC_MSG_CHECKING(for nanosleep link options)
  __ARM4_NANOSLEEP_CHECKLINK([])
  if test "x$NANOSLEEP_LIBS" = xfail ; then
    __ARM4_NANOSLEEP_CHECKLINK([-lrt])
  fi
  if test "x$NANOSLEEP_LIBS" = xfail ; then
    AC_MSG_RESULT(no)
    AC_MSG_ERROR(Unable to link nanosleep)
  else
    AC_MSG_RESULT($NANOSLEEP_LIBS)
  fi
])