autoconf-wrapper: merge history

This is reconstructed from the CVS & git history from the autoconf &
autoconf-wrapper packages.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 203 insertions, 0 deletions

diff --git a/ac-wrapper.sh b/ac-wrapper.sh
new file mode 100755
index 0000000..e5eda0e
--- /dev/null
+++ b/ac-wrapper.sh
@@ -0,0 +1,203 @@
+#!/bin/sh
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# 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
+
+warn() { printf "ac-wrapper: $*\n" 1>&2; }
+err() { warn "$@"; exit 1; }
+unset IFS
+which() {
+	local p
+	IFS=: # we don't use IFS anywhere, so don't bother saving/restoring
+	for p in ${PATH} ; do
+		p="${p}/$1"
+		[ -e "${p}" ] && echo "${p}" && return 0
+	done
+	unset IFS
+	return 1
+}
+
+#
+# Sanitize argv[0] since it isn't always a full path #385201
+#
+argv0=${0##*/}
+case ${0} in
+	${argv0})
+		# find it in PATH
+		if ! full_argv0=$(which "${argv0}") ; then
+			err "could not locate ${argv0}; file a bug"
+		fi
+		;;
+	*)
+		# re-use full/relative paths
+		full_argv0=$0
+		;;
+esac
+
+if [ "${argv0}" = "ac-wrapper.sh" ] ; then
+	err "Don't call this script directly"
+fi
+
+if [ "${WANT_AUTOCONF}" = "2.1" ] && [ "${argv0}" = "autom4te" ] ; then
+	err "Autoconf 2.13 doesn't contain autom4te.\n" \
+	    "   Either unset WANT_AUTOCONF or don't execute anything\n" \
+	    "   that would use autom4te."
+fi
+
+if ! seq 0 0 2>/dev/null 1>&2 ; then #338518
+	seq() {
+		local f l i
+		case $# in
+			1) f=1 i=1 l=$1;;
+			2) f=$1 i=1 l=$2;;
+			3) f=$1 i=$2 l=$3;;
+		esac
+		while :; do
+			[ $l -lt $f -a $i -gt 0 ] && break
+			[ $f -lt $l -a $i -lt 0 ] && break
+			echo $f
+			: $(( f += i ))
+		done
+		return 0
+	}
+fi
+
+#
+# Set up bindings between actual version and WANT_AUTOCONF;
+# Start at last known unstable/stable versions to speed up lookup process.
+#
+if [ -z "${KNOWN_AUTOCONF}" ] ; then
+	KNOWN_AUTOCONF="2.71:2.5 2.70:2.5 2.69:2.5"
+fi
+vers="${KNOWN_AUTOCONF} 9999:2.5 $(printf '2.%s:2.5 ' `seq 99 -1 59`) 2.13:2.1"
+
+binary=""
+for v in ${vers} ; do
+	auto_ver=${v%:*}
+	if [ -z "${binary}" ] && [ -x "${full_argv0}-${auto_ver}" ] ; then
+		binary="${full_argv0}-${auto_ver}"
+		break
+	fi
+done
+if [ -z "${binary}" ] ; then
+	err "Unable to locate any usuable version of autoconf.\n" \
+	    "\tI tried these versions: ${vers}\n" \
+	    "\tWith a base name of '${full_argv0}'."
+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
+			warn "warning: invalid WANT_AUTOCONF '${WANT_AUTOCONF}'; ignoring."
+			unset WANT_AUTOCONF
+			break
+		fi
+
+		auto_ver=${v%:*}
+		want_ver=${v#*:}
+		for wx in ${WANT_AUTOCONF} ; do
+			if [ -x "${full_argv0}-${wx}" ] ; then
+				binary="${full_argv0}-${wx}"
+				v="x"
+			elif [ "${wx}" = "${want_ver}" ] && [ -x "${full_argv0}-${auto_ver}" ] ; then
+				binary="${full_argv0}-${auto_ver}"
+				v="x"
+			fi
+		done
+		[ "${v}" = "x" ] && break
+	done
+fi
+
+#
+# autodetect helpers
+#
+acprereq_version() {
+	sed -n -r \
+		-e '/^\s*(#|dnl)/d' \
+		-e '/AC_PREREQ/s:.*AC_PREREQ\s*\(\[?\s*([0-9.]+)\s*\]?\):\1:p' \
+		"$@" |
+	LC_ALL=C sort -n -t . |
+	tail -1
+}
+
+generated_version() {
+	local re='^# Generated (by (GNU )?Autoconf|automatically using autoconf version) ([0-9.]+).*'
+	sed -n -r "/${re}/{s:${re}:\3:;p;q}" "$@"
+}
+
+#
+# autodetect routine
+#
+if [ "${WANT_AUTOCONF}" = "2.1" ] && [ -f "configure.ac" ] ; then
+	err "Since configure.ac is present, aclocal always use\n" \
+	    "\tautoconf 2.59+, which conflicts with your choice and\n" \
+	    "\tcauses error. You have two options:\n" \
+	    "\t1. Try execute command again after removing configure.ac\n" \
+	    "\t2. Don't set WANT_AUTOCONF"
+fi
+
+if [ "${WANT_AUTOCONF:-2.1}" = "2.1" ] && [ -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=$(ls aclocal.m4 acinclude.m4 configure.in configure.ac 2>/dev/null)
+		[ -n "${acfiles}" ] && confversion=$(acprereq_version ${acfiles})
+
+		[ -z "${confversion}" ] && [ -r "configure" ] \
+			&& confversion=$(generated_version configure)
+
+		if [ "${confversion}" = "2.1" ] && [ ! -f "configure.ac" ] ; then
+			binary="${full_argv0}-2.13"
+		fi
+	esac
+fi
+
+if [ -n "${WANT_ACWRAPPER_DEBUG}" ] ; then
+	if [ -n "${WANT_AUTOCONF}" ] ; then
+		warn "DEBUG: WANT_AUTOCONF is set to ${WANT_AUTOCONF}"
+	fi
+	warn "DEBUG: will execute <${binary}>"
+fi
+
+#
+# for further consistency
+#
+if [ -z "${WANT_AUTOCONF}" ] ; then
+	for v in ${vers} ; do
+		auto_ver=${v%:*}
+		want_ver=${v#*:}
+		if [ "${binary}" = "${full_argv0}-${auto_ver}" ] ; then
+			export WANT_AUTOCONF="${want_ver}"
+			break
+		fi
+	done
+fi
+
+#
+# Now try to run the binary
+#
+if [ ! -x "${binary}" ] ; then
+	# this shouldn't happen
+	err "${binary} is missing or not executable.\n" \
+	    "\tPlease try emerging the correct version of autoconf."
+fi
+
+exec "${binary}" "$@"
+# The shell will error out if `exec` failed.