From: Eric Niebler <eniebler@fb.com>
Date: Fri, 15 Sep 2017 21:21:45 +0000 (-0700)
Subject: Fix coroutine feature test macro on MSVC
X-Git-Tag: v2017.09.18.00^0
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=271977282fe30d3c351b5e8a6f1692d743996ed1;p=folly.git

Fix coroutine feature test macro on MSVC

Summary: Coroutines are only available on MSVC when the /await compiler switch was passed, in which case the `_RESUMABLE_FUNCTIONS_SUPPORTED` macro is defined.

Reviewed By: Orvid

Differential Revision: D5837303

fbshipit-source-id: af3349646e8875e3eac1bc3bbf47203f41f0bbde
---

diff --git a/folly/Portability.h b/folly/Portability.h
index 87be0b29..060085c3 100644
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -426,6 +426,6 @@ constexpr auto kMscVer = 0;
 #define FOLLY_CPP14_CONSTEXPR inline
 #endif
 
-#if __cpp_coroutines >= 201703L || _MSC_VER
+#if __cpp_coroutines >= 201703L || (_MSC_VER && _RESUMABLE_FUNCTIONS_SUPPORTED)
 #define FOLLY_HAS_COROUTINES 1
 #endif