configure: do not use bash's expr match

It looks like there are some incompatibilities in bash's expr match
among different versions. Using set -x, gives us on bash 4.2.45:

+ TOOLS=' netsniff-ng trafgen ifpps bpfc'
+ for tool in '$_tools'
+ case "$tool" in
++ expr match '"curvetun' 'astraceroute"' '$1'
expr: syntax error
+ m=
+ '[' '' == 0 ']'

So rather avoid using "expr match" and switch to "case" for substring
matching, which should be more portable.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/configure b/configure
index 64a7fc9..8ef4ac1 100755
--- a/configure
+++ b/configure
@@ -25,15 +25,15 @@ trap 'status=$?; rm -rf $TMPDIR; exit $status' EXIT HUP INT QUIT TERM
 tools_remove()
 {
 	local _tools=$TOOLS
+	local _todel=$1
 	TOOLS=""
 	for tool in $_tools ; do
 		case "$tool" in
-		$1)
-			m=`expr match \"$TOOLS_NOBUILD\" '$1'`
-			if [ "$m" == "0" ] ; then
-				TOOLS_NOBUILD="$TOOLS_NOBUILD $tool"
-			fi
-			;;
+		$_todel)
+			case $_todel in
+			$TOOLS_NOBUILD) ;;
+			*) TOOLS_NOBUILD="$TOOLS_NOBUILD $tool" ;;
+			esac ;;
 		*) TOOLS="$TOOLS $tool" ;;
 		esac
 	done