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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. which 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>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-21
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
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
])
</pre>
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