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Autoconf Macro: ac_numeric_namedlevel
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<h1>
ac_numeric_namedlevel
</h1>
<h2>
SYNOPSIS
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_NUMERIC_NAMEDLEVEL(VARNAME [,FROMVAR [,DEFAULT
[,YESLEVEL]]])</code>
</p>
<h2>
DESCRIPTION
</h2>
<div class="indent">
<p>
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:
</p>
<pre>
default YESLEVEL = 2 /* including unknown levelspec */
default DEFAULT = 0 /* when named level is empty */
default FROMVAR = VARNAME
</pre>
<p>
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").
</p>
<p>
the mnemonic names are:
</p>
<pre>
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
</pre>
<p>
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
</p>
<p>
Example usage:
</p>
<pre>
AC_NUMERIC_NAMEDLEVEL(OPTLEVEL,with_optlevel,1,3)
AC_DEFINE(OPTLEVEL)
test "$GCC" = "yes" && CFLAGS="$CFLAGS -O$OPTLEVEL)
</pre>
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<h2>
SOURCE CODE
</h2>
<p class="indent">
<a href=
"http://autoconf-archive.cryp.to/ac_numeric_namedlevel.m4">http://autoconf-archive.cryp.to/ac_numeric_namedlevel.m4</a>
</p>
<h2>
LICENSE
</h2>
<div class="indent">
<p style="white-space:nowrap;">
Copyright © 2008 Guido U. Draheim <guidod@gmx.de>
</p>
<p>
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 2 of the License, or (at your option)
any later version.
</p>
<p>
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
</p>
<p>
You should have received a copy of the GNU General Public License along
with this program. If not, see <<a href=
"http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>>.
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