source: trunk/essentials/sys-devel/autoconf-wrapper/ac-wrapper-4.sh@ 3558

#!sh.exe
# Copyright 1999-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-devel/autoconf-wrapper/files/ac-wrapper-4.sh,v 1.4 2006/11/26 14:35:36 vapier Exp $

# Based on the ac-wrapper.pl script provided by MandrakeSoft
# Rewritten in bash by Gregorio Guidi
#
# Executes the correct autoconf version.
#
# - defaults to newest version available (hopefully autoconf-2.60)
# - runs autoconf 2.13 if:
#   - envvar WANT_AUTOCONF is set to `2.1'
#     -or-
#   - `ac{local,include}.m4' or `configure.{in,ac}' have AC_PREREQ(2.1) (not higher)
#     -or-
#   - `configure' is already present and was generated by autoconf 2.13

if [ "${0##*/}" = "ac-wrapper.sh" ] ; then
        echo "Don't call this script directly" >&2
        exit 1
fi

if [ "${WANT_AUTOCONF}" = "2.1"  -a  "${0##*/}" = "autom4te" ] ; then
        echo "ac-wrapper: Autoconf 2.13 doesn't contain autom4te." >&2
        echo "            Either unset WANT_AUTOCONF or don't execute anything" >&2
        echo "            that would use autom4te." >&2
        exit 1
fi

#
# Set up bindings between actual version and WANT_AUTOCONF
#
vers="2.61:2.5 2.60:2.5 2.59:2.5 2.13:2.1"

binary=""
for v in ${vers} ; do
        auto_ver=${v%:*}
        if [ -z "${binary}" ] && [ -x "${0}-${auto_ver}" ] ; then
                binary="${0}-${auto_ver}"
        fi
done
if [ -z "${binary}" ] ; then
        echo "ac-wrapper: Unable to locate any usuable version of autoconf." >&2
        echo "            I tried these versions: ${vers}" >&2
        echo "            With a base name of '${0}'." >&2
        exit 1
fi

#
# Check the WANT_AUTOCONF setting.  We accept a whitespace delimited
# list of autoconf versions.
#
if [ -n "${WANT_AUTOCONF}" ] ; then
        for v in ${vers} x ; do
                if [ "${v}" = "x" ] ; then
                        echo "ac-wrapper: warning: invalid WANT_AUTOCONF '${WANT_AUTOCONF}'; ignoring." >&2
                        unset WANT_AUTOCONF
                        break
                fi

                auto_ver=${v%:*}
                want_ver=${v#*:}
                for wx in ${WANT_AUTOCONF} ; do
                        if [ "${wx}" = "${want_ver}" ] && [ -x "${0}-${auto_ver}" ] ; then
                                binary="${0}-${auto_ver}"
                                v="x"
                        fi
                done
                [ "${v}" = "x" ] && break
        done
fi

#
# autodetect helpers
#
acprereq_version() {
        gawk \
        '($0 !~ /^[[:space:]]*(#|dnl)/) {
                if (match($0, "AC_PREREQ\\(\\[?([0-9]\\.[0-9])", res))
                        VERSIONS[COUNT++] = res[1]
        }

        END {
                asort(VERSIONS)
                print VERSIONS[COUNT]
        }' "$@"
}

generated_version() {
        gawk \
        '{
                if (match($0,
                          "^# Generated (by (GNU )?Autoconf|automatically using autoconf version) ([0-9].[0-9])",
                          res)) {
                        print res[3]
                        exit
                }
        }' "$@"
}

#
# autodetect routine
#
if [ "${WANT_AUTOCONF}" = "2.1"  -a  -f "configure.ac" ] ; then
        echo "ac-wrapper: Since configure.ac is present, aclocal always use" >&2
        echo "            autoconf 2.59+, which conflicts with your choice and" >&2
        echo "            causes error. You have two options:" >&2
        echo "            1. Try execute command again after removing configure.ac" >&2
        echo "            2. Don't set WANT_AUTOCONF" >&2
        exit 1
fi

if [ "${WANT_AUTOCONF}" != "2.5"  -a  -n "${WANT_AUTOMAKE}" ] ; then
        # Automake-1.7 and better require autoconf-2.5x so if WANT_AUTOMAKE
        # is set to an older version, let's do some sanity checks.
        case "${WANT_AUTOMAKE}" in
        1.[456])
                acfiles=$(ls ac{local,include}.m4 configure.{in,ac} 2>/dev/null)
                [ -n "${acfiles}" ] && confversion=$(acprereq_version ${acfiles})
                
                [ -z "${confversion}"  -a  -r "configure" ] \
                        && confversion=$(generated_version configure)

                if [ "${confversion}" = "2.1"  -a  ! -f "configure.ac" ] ; then
                        binary="${0}-2.13"
                fi
        esac
fi

if [ -n "${WANT_ACWRAPPER_DEBUG}" ] ; then
        if [ -n "${WANT_AUTOCONF}" ] ; then
                echo "ac-wrapper: DEBUG: WANT_AUTOCONF is set to ${WANT_AUTOCONF}" >&2
        fi
        echo "ac-wrapper: DEBUG: will execute <${binary}>" >&2
fi

#
# for further consistency
#
for v in ${vers} ; do
        auto_ver=${v%:*}
        want_ver=${v#*:}
        if [ "${binary}" = "${0}-${auto_ver}" ] ; then
                export WANT_AUTOCONF="${want_ver}"
        fi
done

#
# Now try to run the binary
#
if [ ! -x "${binary}" ] ; then
        # this shouldn't happen
        echo "ac-wrapper: ${binary} is missing or not executable." >&2
        echo "            Please try emerging the correct version of autoconf." >&2
        exit 1
fi

exec "${binary}" "$@"

echo "ac-wrapper: was unable to exec ${binary} !?" >&2
exit 1