[PATCH iproute2-next 0/2] configure: convert global env to command-line options

@@ -7,7 +7,7 @@
 #                           off: disable libbpf probing
 #   LIBBPF_DIR              Path to libbpf DESTDIR to use
 
-INCLUDE=${1:-"$PWD/include"}
+INCLUDE="$PWD/include"
 
 # Output file which is input to Makefile
 CONFIG=config.mk

@@ -486,6 +486,35 @@ endif
 EOF
 }
 
+usage()
+{
+	cat <<EOF
+Usage: $0 [OPTIONS]
+	--include_dir		Path to iproute2 include dir
+	-h | --help		Show this usage info
+EOF
+	exit $1
+}
+
+# Compat with the old INCLUDE path setting method.
+if [ $# -eq 1 ] && [ "$(echo $1 | cut -c 1)" != '-' ]; then
+	INCLUDE="$1"
+else
+	while true; do
+		case "$1" in
+			--include_dir)
+				INCLUDE=$2
+				shift 2 ;;
+			-h | --help)
+				usage 0 ;;
+			"")
+				break ;;
+			*)
+				usage 1 ;;
+		esac
+	done
+fi
+
 echo "# Generated config based on" $INCLUDE >$CONFIG
 quiet_config >> $CONFIG
 

@@ -1,11 +1,6 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # This is not an autoconf generated configure
-#
-# Influential LIBBPF environment variables:
-#   LIBBPF_FORCE={on,off}   on: require link against libbpf;
-#                           off: disable libbpf probing
-#   LIBBPF_DIR              Path to libbpf DESTDIR to use
 
 INCLUDE="$PWD/include"
 

@@ -491,6 +486,10 @@ usage()
 	cat <<EOF
 Usage: $0 [OPTIONS]
 	--include_dir		Path to iproute2 include dir
+	--libbpf_dir		Path to libbpf DESTDIR
+	--libbpf_force		Enable/disable libbpf by force. Available options:
+				  on: require link against libbpf, quit config if no libbpf support
+				  off: disable libbpf probing
 	-h | --help		Show this usage info
 EOF
 	exit $1

@@ -505,6 +504,15 @@ else
 			--include_dir)
 				INCLUDE=$2
 				shift 2 ;;
+			--libbpf_dir)
+				LIBBPF_DIR="$2"
+				shift 2 ;;
+			--libbpf_force)
+				if [ "$2" != 'on' ] && [ "$2" != 'off' ]; then
+					usage 1
+				fi
+				LIBBPF_FORCE=$2
+				shift 2 ;;
 			-h | --help)
 				usage 0 ;;
 			"")