From a5f14fdd8969304a3a57caa65c6e73abe4970a1a Mon Sep 17 00:00:00 2001
From: "Zeyi (Rice) Fan" <zeyi@fb.com>
Date: Wed, 15 Jul 2020 10:19:10 -0700
Subject: [PATCH] fix boost macOS build with new Xcode

Summary:
When we build boost 1.69.0 with newer version of Xcode, it will fail with:

```
clang: error: unknown argument: '-fcoalesce-templates'
```

This commit fixes this build failure by telling boost's build system that we are building with clang on macOS.

Reviewed By: chadaustin

Differential Revision: D22417488

fbshipit-source-id: 0b3d22835abbba6d06812c656acb0311a60d8c67
---
 build/fbcode_builder/manifests/boost | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/build/fbcode_builder/manifests/boost b/build/fbcode_builder/manifests/boost
index f051cfd1b0341..4b254e308ab2a 100644
--- a/build/fbcode_builder/manifests/boost
+++ b/build/fbcode_builder/manifests/boost
@@ -81,3 +81,6 @@ builder = boost
 --with-timer
 --with-type_erasure
 --with-wave
+
+[b2.args.os=darwin]
+toolset=clang