commit 08d2220082cf5c8cc474a6621fe3bfa63c9aa277
from: Omar Polo <op@omarpolo.com>
date: Fri Sep 30 09:48:42 2022 UTC

fix -MMD test

runtest first tries *without* the given extra-cflags, so -MMD was
never added.  singletest, instead, always use the args

commit - e750b7de7ae0c07b566cfb80d67dda143141c51b
commit + 08d2220082cf5c8cc474a6621fe3bfa63c9aa277
blob - 5ed746ef37f1cfa26415584e923bf7b1f7bfe2e8
blob + e049bdcf44d10dd480ab5575fd803ba5307ab2f6
--- configure
+++ configure
@@ -251,7 +251,8 @@ runtest() {
 	return 1
 }
 
-if runtest MMD _MMD -MMD >/dev/null; then
+if singletest MMD _MMD -MMD >/dev/null; then
+	CFLAGS="${CFLAGS} -MMD"
 	echo "adding -MMD to CFLAGS" >&2
 	echo "adding -MMD to CFLAGS" >&3
 fi