ac_define_versionlevel

if the VERSION is ommitted, shellvar $VERSION is used as defined by AM_INIT_AUTOMAKE's second argument.

The versionlevel is the numeric representation of the given version string, thereby assuming the inputversion is a string with (maximal) three decimal numbers seperated by "."-dots. A "-patch" adds a percent.

typical usage: AM_INIT_AUTOMAKE(mypkg,4.12.3) AC_DEFINE_VERSIONLEVEL(MYPKG_VERSION)

the config.h created from autoheader's config.h.in will contain... /* mypkg versionlevel */ #define MYPKG_VERSION 4120003

the MYKG_VERSION will be defined as both a shell-variable and AC_DEFINE

examples:
        3.0-beta1     3000001
        3.1           3010000
        3.11          3110000
        3.11-dirpatch 3111000
        3.11-patch6   3110006
        2.2.18        2020018
        2.0.112       2000112
        2.4.2         2040002
        2.4.2-pre     2040003 
        2.4.2-pre5    2040003
        5.0-build125  5000125 
        5.0           5000000
        0.30.17       30017

AC_DEFUN(AC_DEFINE_VERSIONLEVEL,
[
ac_versionlevel_strdf=`echo ifelse($2, , $VERSION, $2) | sed -e 's:[[A-Z-]]*:.:' -e 's:[[^0-9.]]::g' -e 's:^[[.]]*::'`
AC_MSG_CHECKING(versionlevel $ac_versionlevel_strdf)
case $ac_versionlevel_strdf in
 *.*.*.|*.*.*.*) :
 ac_versionlevel_major=`echo $ac_versionlevel_strdf`
 ac_versionlevel_minor=`echo $ac_versionlevel_major | sed -e 's/[[^.]]*[[.]]//'`
 ac_versionlevel_patch=`echo $ac_versionlevel_minor | sed -e 's/[[^.]]*[[.]]//'`
 ac_versionlevel_major=`echo $ac_versionlevel_major | sed -e 's/[[.]].*//'`
 ac_versionlevel_minor=`echo $ac_versionlevel_minor | sed -e 's/[[.]].*//'`
 ac_versionlevel_patch=`echo $ac_versionlevel_patch | sed -e 's/[[.]].*//'`
 $1=`expr $ac_versionlevel_major '*' 1000000 \
        + $ac_versionlevel_minor '*'   10000 \
        + $ac_versionlevel_patch \
	+ 1` ;;
 *.*.*) :
 ac_versionlevel_major=`echo $ac_versionlevel_strdf`
 ac_versionlevel_minor=`echo $ac_versionlevel_major | sed -e 's/[[^.]]*[[.]]//'`
 ac_versionlevel_patch=`echo $ac_versionlevel_minor | sed -e 's/[[^.]]*[[.]]//'`
 ac_versionlevel_major=`echo $ac_versionlevel_major | sed -e 's/[[.]].*//'`
 ac_versionlevel_minor=`echo $ac_versionlevel_minor | sed -e 's/[[.]].*//'`
 ac_versionlevel_patch=`echo $ac_versionlevel_patch | sed -e 's/[[.]].*//'`
 $1=`expr $ac_versionlevel_major '*' 1000000 \
        + $ac_versionlevel_minor '*'   10000 \
        + $ac_versionlevel_patch`               ;;
 *.*.) :
 ac_versionlevel_major=`echo $ac_versionlevel_strdf`
 ac_versionlevel_minor=`echo $ac_versionlevel_major | sed -e 's/[[^.]]*[[.]]//'`
 ac_versionlevel_major=`echo $ac_versionlevel_major | sed -e 's/[[.]].*//'`
 ac_versionlevel_minor=`echo $ac_versionlevel_minor | sed -e 's/[[.]].*//'`
 ac_versionlevel_patch=0
 $1=`expr $ac_versionlevel_major '*' 1000000 \
        + $ac_versionlevel_minor '*'   10000 \
	+ 1000 \
        + $ac_versionlevel_patch`               ;;
 *.*) :
 ac_versionlevel_major=`echo $ac_versionlevel_strdf`
 ac_versionlevel_minor=`echo $ac_versionlevel_major | sed -e 's/[[^.]]*[[.]]//'`
 ac_versionlevel_major=`echo $ac_versionlevel_major | sed -e 's/[[.]].*//'`
 ac_versionlevel_minor=`echo $ac_versionlevel_minor | sed -e 's/[[.]].*//'`
 ac_versionlevel_patch=0
 $1=`expr $ac_versionlevel_major '*' 1000000 \
        + $ac_versionlevel_minor '*'   10000 \
        + $ac_versionlevel_patch`               ;;
 *.) :
 ac_versionlevel_major=0
 ac_versionlevel_minor=`echo $ac_versionlevel_strdf`
 ac_versionlevel_minor=`echo $ac_versionlevel_minor | sed -e 's/[[.]].*//'`
 ac_versionlevel_patch=0
 $1=`expr $ac_versionlevel_major '*' 1000000 \
        + $ac_versionlevel_minor '*'   10000 \
	+ 1000 \
        + $ac_versionlevel_patch`               ;;
 *) :
 ac_versionlevel_major=0
 ac_versionlevel_minor=`echo $ac_versionlevel_strdf`
 ac_versionlevel_minor=`echo $ac_versionlevel_minor | sed -e 's/[[.]].*//'`
 ac_versionlevel_patch=0
 $1=`expr $ac_versionlevel_major '*' 1000000 \
        + $ac_versionlevel_minor '*'   10000 \
        + $ac_versionlevel_patch`               ;;
esac
AC_MSG_RESULT($[$1])
AC_DEFINE_UNQUOTED( $1, $[$1], ifelse( $3, , $PACKAGE versionlevel, $3))
])