libtool: Improved stage 0 build to create an ${arch_target}-libtool be used in stage 1

base/libtool/libtool.conf

@@ -0,0 +1,57 @@
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+# 
+# Filename: package/.../libtool/libtool.conf
+# Copyright (C) 2007 The OpenSDE Project
+# 
+# More information can be found in the files COPYING and README.
+# 
+# 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; version 2 of the License. A copy of the
+# GNU General Public License can be found in the file COPYING.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+if atstage toolchain; then
+	buildloops=2
+
+	hook_add preconf 5 'libtool_cross'
+	libtool_cross() {
+		if [ $buildloop -eq 2 ]; then
+			# on the second loop we make it a cross compiler
+			
+			# remove --target and --host (default's at stage 0)
+			var_remove_regex confopt ' ' '--target=.*'
+			var_remove_regex confopt ' ' '--host=.*'
+
+			# add --build and --host (default's at stage 1)
+			var_append confopt ' ' '--build=$arch_build'
+			var_append confopt ' ' '--host=$arch_target'
+
+			# and set the prefix and the bindir (as gcc's)
+			var_append extraconfopt ' ' '--program-prefix=${arch_target}-'
+
+			hook_add postmake 5 'libtool_cross_tweak'
+		fi
+	}
+
+	# if we `export` them 0-libtool's configure will try to test that $CC is able
+	# to produce binaries, but as 1-glibc is not yet built the crt.o file is not
+	# found and the test fails.
+	libtool_cross_tweak() {
+		local x= y=
+
+		# set the right CC,CXX,AR,....
+		for x in gcc g++ ar ld nm strip as ranlib; do
+			case "$x" in
+				gcc)	y=CC	;;
+				g++)	y=CXX	;;
+				*)	y=$( echo $x | tr [a-z] [A-Z] )	;;
+			esac
+
+			# TODO: turn this into a single `sed` call
+			sed -i -e "s,^$y=.*,$y=\"${arch_target}-$x\"," "$root$bindir/${arch_target}-libtool"
+		done
+	}
+fi
+