ax_numeric_namedlevel
=====================

Synopsis
********

     AX_NUMERIC_NAMEDLEVEL(VARNAME [,FROMVAR [,DEFAULT [,YESLEVEL]]])

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 that 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:

       AX_NUMERIC_NAMEDLEVEL(OPTLEVEL,with_optlevel,1,3)
       AC_DEFINE(OPTLEVEL)
       test "$GCC" = "yes" && CFLAGS="$CFLAGS -O$OPTLEVEL)

Source Code
***********

Download the latest version of ax_numeric_namedlevel.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_numeric_namedlevel.m4) or browse the macro's revision history (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_numeric_namedlevel.m4).

License
*******

Copyright © 2008 Guido U. Draheim guidod@gmx.de

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

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