[PATCH iproute2 v3 1/3] configure: support --param=value style

[Andrea Claudi <aclaudi@redhat.com>]

This commit makes it possible to specify values for configure params
using the common autotools configure syntax '--param=value'.

Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
---
 configure | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/configure b/configure
index 7f4f3bd9..d57ce0f8 100755
--- a/configure
+++ b/configure
@@ -501,18 +501,30 @@ if [ $# -eq 1 ] && [ "$(echo $1 | cut -c 1)" != '-' ]; then
 else
 	while true; do
 		case "$1" in
-			--include_dir)
-				INCLUDE=$2
-				shift 2 ;;
-			--libbpf_dir)
-				LIBBPF_DIR="$2"
-				shift 2 ;;
-			--libbpf_force)
-				if [ "$2" != 'on' ] && [ "$2" != 'off' ]; then
+			--include_dir | --include_dir=*)
+				INCLUDE="${1#*=}"
+				if [ "$INCLUDE" == "--include_dir" ]; then
+					INCLUDE=$2
+					shift
+				fi
+				shift ;;
+			--libbpf_dir | --libbpf_dir=*)
+				LIBBPF_DIR="${1#*=}"
+				if [ "$LIBBPF_DIR" == "--libbpf_dir" ]; then
+					LIBBPF_DIR="$2"
+					shift
+				fi
+				shift ;;
+			--libbpf_force | --libbpf_force=*)
+				LIBBPF_FORCE="${1#*=}"
+				if [ "$LIBBPF_FORCE" == "--libbpf_force" ]; then
+					LIBBPF_FORCE="$2"
+					shift
+				fi
+				if [ "$LIBBPF_FORCE" != 'on' ] && [ "$LIBBPF_FORCE" != 'off' ]; then
 					usage 1
 				fi
-				LIBBPF_FORCE=$2
-				shift 2 ;;
+				shift ;;
 			-h | --help)
 				usage 0 ;;
 			"")
-- 
2.31.1