From 9d3b0a4bc42652151ea000dae6aaa519277ac822 Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Mon, 12 Mar 2018 15:24:34 -0700
Subject: [PATCH] Enable thread safety annotations in clang/libc++ (#128)

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

diff --git a/build/config/clang/BUILD.gn b/build/config/clang/BUILD.gn
index 8c8d36124ca73..30beb12008c63 100644
--- a/build/config/clang/BUILD.gn
+++ b/build/config/clang/BUILD.gn
@@ -14,4 +14,6 @@ config("extra_warnings") {
     "-Wstring-conversion",
     "-Wthread-safety",
   ]
+
+  defines = [ "_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS" ]
 }