From cc00a549afa060943a599a5a1b2487bc5cb07457 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Sat, 31 Mar 2018 19:17:40 +0900
Subject: [PATCH] Don't use -Wunguarded-availability

---
 build/config/compiler/BUILD.gn | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index d288e17..5167841 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -1250,7 +1250,8 @@ config("default_warnings") {
     if ((is_mac || is_ios) && !is_nacl) {
       # When compiling Objective-C, warns if a method is used whose
       # availability is newer than the deployment target.
-      cflags += [ "-Wunguarded-availability" ]
+      # PATCH(build-gn): This is not available on old clang.
+      # cflags += [ "-Wunguarded-availability" ]
     }
 
     if (is_ios) {