autoconf-wrapper: slightly rework handling of 2.1 version alias

The 2.1 alias only ever expanded into the 2.13 version.  Every other
version uses the 2.5 alias, and at this point, seems extremely unlikely
that this will ever change (or that we'd add a new alias set).  Rework
the WANT_AUTOCONF checking logic to rewrite 2.1 to 2.13, and then accept
any non-2.13 version when 2.5 is used.  This will allow us to burn down
the alias logic entirely which will simplify the code nicely.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/ac-wrapper.sh b/ac-wrapper.sh
index 6cb436b..4682082 100755
--- a/ac-wrapper.sh
+++ b/ac-wrapper.sh
@@ -108,17 +108,24 @@ if [ -n "${WANT_AUTOCONF}" ] ; then
 		fi
 
 		auto_ver=${v%:*}
-		want_ver=${v#*:}
 		for wx in ${WANT_AUTOCONF} ; do
 			if [ "${wx}" = "latest" ] ; then
 				wx="2.5"
+			elif [ "${wx}" = "2.1" ] ; then
+				wx="2.13"
 			fi
 			if [ -x "${full_argv0}-${wx}" ] ; then
 				binary="${full_argv0}-${wx}"
 				v="x"
-			elif [ "${wx}" = "${want_ver}" ] && [ -x "${full_argv0}-${auto_ver}" ] ; then
-				binary="${full_argv0}-${auto_ver}"
-				v="x"
+			elif [ "${wx}" = "2.5" ] ; then
+				if [ "${auto_ver}" = "2.13" ] ; then
+					# The "2.5" alias accepts every version except 2.13.
+					continue
+				fi
+				if [ -x "${full_argv0}-${auto_ver}" ] ; then
+					binary="${full_argv0}-${auto_ver}"
+					v="x"
+				fi
 			fi
 		done
 		[ "${v}" = "x" ] && break