Macro: ac_numeric_namedlevel

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Synopsis

  `AC_NUMERIC_NAMEDLEVEL(VARNAME [,FROMVAR [,DEFAULT [,YESLEVEL]]])`

Version

  1.1 (2001/10/12) guidod @ ac-archive-0.5.39

Author

  Guido Draheim <guidod@gmx.de>

Description

  the levelstring FROMVAR is expanded and checked for verbal names that will map on to eight different levels - the VARNAME will receive this numeric level where "all" maps to 7 (lower three bits set) higher levels for 8 and 9 exist too. This macro is a nice helper to convert user input of a --with-opt=level into a numeric form. which can be simply pushed as a #define like with AC_DEFINE

  default YESLEVEL = 2 /* including unknown levelspec */ default DEFAULT = 0 /* when named level is empty */ default FROMVAR = VARNAME

  The DEFAULT value is used if the NAMED levelstring has become empty and it is copied without further conversion - a default of "0" is used if absent - identical to "no". A "yes" will be set to the YESLEVEL - and note that "yes" has "2" as its default value not "1". (which comes from its original use to set a "gcc -O2").

  the mnemonic names are:
  `9| insane |ultrasome|experimentalplus`
  `8| ultra |ultra|experimental)`
  `7| all |muchmore|somemanymore|manymoreplus`
  `6| most |manymore|most)`
  `5| strict |somemore|almost`
  `4| more |more`
  `3| extra |manyplus|plusmuch|somemany|plusmany`
  `2| many |many|much|(yes)`
  `1| some |some|plus`
  note that a level can be construcct of (some|plus) = bit-0, (many|much) = bit-1, (more) = bit-2, (ultra|experimental) = bit-3 atleast in a left-to-right order, ie. plusmanymore=7

  example usage:
  `AC_NUMERIC_NAMEDLEVEL(OPTLEVEL,with_optlevel,1,3)`
  `AC_DEFINE(OPTLEVEL)`
  `test "$GCC" = "yes" && CFLAGS="$CFLAGS -O$OPTLEVEL)`

M4 Source Code

      AC_DEFUN([AC_NUMERIC_NAMEDLEVEL],
      [dnl the names to be defined...
      $1="ifelse($1,,[$]$2,[$]$1)" ; $1="[$]$1"
      $1="[$]$1" ; $1="[$]$1"
      if test "_[$]$1" = "_" ; then
        $1="ifelse([$3],,0,[$3])"
      elif test "_[$]$1" = "_yes" ; then
        $1="ifelse([$4],,2,[$4])"
      else
        $1=`echo [$]$1 | sed -e 's,some,plus,' -e 's,experimental,ultra,' -e 's,over,ultra,' -e 's,much,many,'`
        case "[$]$1" in
          0*|1*|2*|3*|4*|5*|6*|7*|8*|9*|-*|+*) ;;   # leave as is
          insane|ultraplus|plusultra)                 $1="9" ;;
          ultra)                                      $1="8" ;;
          manymoreplus|manyplusmore|plusmanymore|all) $1="7" ;;
          moremanyplus|moreplusmany|plusmoremany)     $1="7" ;;
          manymore|moremany|most)                     $1="6" ;;
          somemore|moresome|almost)                   $1="5" ;;
          more)                                       $1="4" ;;
          manyplus|plusmany|extra)                    $1="3" ;;
          many)                                       $1="2" ;;
          plus)                                       $1="1" ;;
          no)                                         $1="0" ;;
          yes) $1="ifelse([$4],,2,[$4])" ;;
          *)   $1="ifelse([$3],,1,[$3])" ;; # for other unkown stuff.
        esac
      fi
      ])