From 2c625d5cd97e9cb133072feab2edb6b8c78861ef Mon Sep 17 00:00:00 2001
From: Alex Lapenkou <lapenkov@fb.com>
Date: Thu, 12 Aug 2021 19:02:12 -0700
Subject: [PATCH] Fix warnings when compiled with clang

When clang sees an unknown warning option, unlike gcc it doesn't fail the build
with error. It issues a warning. Hence JE_CFLAGS_ADD with warning options that
didnt't exist in clang would still mark those options as available. This led to
several warnings when built with clang or "gcc" on OSX. This change fixes those
warnings by simply making clang fail builds with non-existent warning options.
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index 5eb4d46f..3e18f4a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -244,6 +244,7 @@ if test "x$GCC" = "xyes" ; then
       AC_DEFINE_UNQUOTED([JEMALLOC_HAS_RESTRICT])
     fi
   fi
+  JE_CFLAGS_ADD([-Werror=unknown-warning-option])
   JE_CFLAGS_ADD([-Wall])
   JE_CFLAGS_ADD([-Wextra])
   JE_CFLAGS_ADD([-Wshorten-64-to-32])