build: use -Wno-yacc on bison 3.3+

we only support bison, we don't care about yacc compatibility.

Signed-off-by: David Lamparter <equinox@diac24.net>

diff --git a/configure.ac b/configure.ac
index a7d9b542b998d6ed4db39daf8548fa12bb8e6816..84ee213cd1791077c93561bba029d6db443036cc 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -1859,7 +1859,7 @@ AC_MSG_CHECKING([version of bison])
 frr_ac_bison_version="$(eval $YACC -V | grep bison | head -n 1)"
 frr_ac_bison_version="${frr_ac_bison_version##* }"
 frr_ac_bison_missing="false"
-case "x${frr_ac_bison_version}" in
+case "x${frr_ac_bison_version}x" in
   x2.7*)
     BISON_OPENBRACE='"'
     BISON_CLOSEBRACE='"'
@@ -1876,11 +1876,17 @@ case "x${frr_ac_bison_version}" in
     AC_MSG_WARN([could not determine bison version.  Please install GNU bison 2.7.x or newer.])
     frr_ac_bison_missing="true"
     ;;
-  *)
+  x3.[012][^0-9]*)
     BISON_OPENBRACE='{'
     BISON_CLOSEBRACE='}'
     BISON_VERBOSE='-Dparse.error=verbose'
-    AC_MSG_RESULT([$frr_ac_bison_version - 3.0 or newer])
+    AC_MSG_RESULT([$frr_ac_bison_version - 3.0 to 3.2])
+    ;;
+  *)
+    BISON_OPENBRACE='{'
+    BISON_CLOSEBRACE='}'
+    BISON_VERBOSE='-Dparse.error=verbose -Wno-yacc'
+    AC_MSG_RESULT([$frr_ac_bison_version - 3.3 or newer])
     ;;
 esac
 AC_SUBST([BISON_OPENBRACE])