Macro: ac_numeric_namedlevel

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# ac_numeric_namedlevel

## Synopsis

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

## Version

1.1 (2001/10/12) guidod @ ac-archive-0.5.32

## 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
    ])