Macro: ac_very_nice

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Synopsis

  `AC_VERY_NICE`

Version

  1.1.1.1 (2001/07/26) Miscellaneous @ ac-archive-0.5.39

Author

  Stephane Bortzmeyer <bortzmeyer@pasteur.fr>

Description

  A macro to check the options of nice, in order to have a VERY_NICE variable which runs a program at the lowest priority VERY_NICE is undefined if we don't find the proper options, so you can safely use:

  `@VERY_NICE@ mycommand`

  in a shell script.

  The VERY_NICE variable includes the placeholder NICE_VALUE that you have to instantiate at run-time. If you give a argument to AC_VERY_NICE, it will be used as an argument of nice for testing and included in VERY_NICE instead of the above placeholder.

M4 Source Code

      AC_DEFUN([AC_VERY_NICE],[
      if test "x$1" != "x"; then
        NICE_VALUE=$1
      else
        NICE_VALUE=20
      fi
      AC_CHECK_PROGS(TEST_NICE, date)
      AC_CHECK_PROGS(NICE, nice, )
      AC_MSG_CHECKING(syntax of nice)
      if test "x$NICE" != "x"; then
           if  ( $NICE -n $NICE_VALUE $TEST_NICE > /dev/null 2>&1 ) ;  then
              VERY_NICE="$NICE -n $NICE_VALUE"
           else
            if  ( $NICE -$NICE_VALUE $TEST_NICE > /dev/null 2>&1 ) ;  then
              VERY_NICE="$NICE -$NICE_VALUE"
            fi
           fi
      fi
      if test "x$1" = "x"; then
        VERY_NICE=`echo $VERY_NICE | sed "s/$NICE_VALUE/NICE_VALUE/"`
      fi
      AC_MSG_RESULT($VERY_NICE)
      AC_SUBST(VERY_NICE)
      ])