From f31ef484fd6c0faaa32d620b2b945a1c4512b097 Mon Sep 17 00:00:00 2001
From: Andrei Pavel <andrei@isc.org>
Date: Wed, 20 Oct 2021 10:35:05 +0000
Subject: [PATCH] Apply 1 suggestion(s) to 1 file(s)

---
 m4macros/ax_cpp11.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/m4macros/ax_cpp11.m4 b/m4macros/ax_cpp11.m4
index 0b2b05cd58..86f3ec4359 100644
--- a/m4macros/ax_cpp11.m4
+++ b/m4macros/ax_cpp11.m4
@@ -229,7 +229,7 @@ for retry in "none" "--std=c++11" "--std=c++0x" "--std=c++1x" "fail"; do
 
         AC_MSG_CHECKING(noreturn support)
         feature="noreturn"
-        CPPFLAGS="-Werror -Wimplicit-fallthrough $CPPFLAGS"
+        CPPFLAGS="-Werror=implicit-fallthrough -Wimplicit-fallthrough $CPPFLAGS"
         AC_COMPILE_IFELSE(
                 [AC_LANG_PROGRAM(
                         [#include <cstdlib>