-#! /bin/sh
+#! @SHELL@
# @configure_input@
# Wrapper around a non installed bison to make it work as an installed one.
-# We want to use the files shipped with Bison.
-BISON_SIMPLE='@abs_top_srcdir@/src/bison.simple'
-export BISON_SIMPLE
-BISON_HAIRY='@abs_top_srcdir@/src/bison.hairy'
-export BISON_HAIRY
+# Copyright (C) 2001-2012 Free Software Foundation, Inc.
+#
+# 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 3 of the License, or
+# (at your option) any later version.
+#
+# 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.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
-exec '@abs_top_builddir@/src/bison' ${1+"$@"}
+abs_top_srcdir='@abs_top_srcdir@'
+abs_top_builddir='@abs_top_builddir@'
+: ${PERL=perl}
+
+# Use the shipped files, not those installed.
+BISON_PKGDATADIR=$abs_top_srcdir/data
+export BISON_PKGDATADIR
+
+$PREBISON "$abs_top_builddir/src/bison" ${1+"$@"}
+status=$?
+
+# As a special dark magic, if we are actually using this wrapper to
+# compile Bison's src/parse-gram.y, post-process the synclines to
+# avoid dependencies on the user's set up (srcdir vs. builddir).
+for i
+do
+ case $i in
+ */parse-gram.y)
+ if $PERL --version >/dev/null; then
+ # We are called by ylwrap which still uses y.tab.*, and
+ # post-processes the synclines on y.tab.c itself. Don't let it
+ # do it. Besides, it leaves "parse-gram.y" as the source,
+ # dropping the src/ part.
+ $PERL -pi -e 's{"y\.tab\.}{"parse-gram.}g;' \
+ -e 's{".*/(parse-gram\.y)"}{"$1"}g;' \
+ y.tab.[ch]
+ fi
+ ;;
+ esac
+done
+
+exit $status
+
+# Local Variables:
+# mode: shell-script
+# End: