1 files changed, 95 insertions, 0 deletions
diff --git a/scripts/depdirs-rule.sh b/scripts/depdirs-rule.sh
new file mode 100755
index 00000000..7aba0885
--- /dev/null
+++ b/scripts/depdirs-rule.sh
@@ -0,0 +1,95 @@
+#!/bin/sh
+
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#
+# This (obscure) bash script finds the smallest different path between
+# path1 and path2 given as command line argument. The given paths MUST
+# be relative paths, the script is not designed to work with absolute
+# paths.
+#
+# The script will then generate Makefile code that can be saved in a
+# file and included in build system.
+#
+# For instance:
+#   depdirs-rule.sh a/b/c/d a/b/e/f
+# Will print:
+#   FULL_DEPDIRS-a/b/c/d += a/b/e/f
+#   LOCAL_DEPDIRS-a/b/c += a/b/e
+#
+# The script returns 0 except if invalid arguments are given.
+#
+
+if [ $# -ne 2 ]; then
+	echo "Bad arguments"
+	echo "Usage:"
+	echo "  $0 path1 path2"
+	exit 1
+fi
+
+left1=${1%%/*}
+right1=${1#*/}
+prev_right1=$1
+prev_left1=
+
+left2=${2%%/*}
+right2=${2#*/}
+prev_right2=$2
+prev_left2=
+
+while [ "${right1}" != "" -a "${right2}" != "" ]; do
+
+	if [ "$left1" != "$left2" ]; then
+		break
+	fi
+
+	prev_left1=$left1
+	left1=$left1/${right1%%/*}
+	prev_right1=$right1
+	right1=${prev_right1#*/}
+	if [ "$right1" = "$prev_right1" ]; then
+		right1=""
+	fi
+
+	prev_left2=$left2
+	left2=$left2/${right2%%/*}
+	prev_right2=$right2
+	right2=${prev_right2#*/}
+	if [ "$right2" = "$prev_right2" ]; then
+		right2=""
+	fi
+done
+
+echo FULL_DEPDIRS-$1 += $2
+echo LOCAL_DEPDIRS-$left1 += $left2
+
+exit 0