From: Miroslav Crnic <mcrnic@fb.com>
Date: Wed, 11 Oct 2017 08:43:41 +0000 (-0700)
Subject: Add support for clang intrinsic constexpr
X-Git-Tag: v2017.10.16.00~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=42a989fad8c0f52d5afa482afc5b531ed34887d2;p=folly.git

Add support for clang intrinsic constexpr

Summary: Newer versions of clang >=3.4 support intrinsic constexpr

Reviewed By: Orvid

Differential Revision: D6008856

fbshipit-source-id: 4e40a7032464216d181d76a854cafb2ab4be1be0
---

diff --git a/folly/Bits.h b/folly/Bits.h
index 63eaa4a1..4b71c189 100644
--- a/folly/Bits.h
+++ b/folly/Bits.h
@@ -54,12 +54,11 @@
 
 #pragma once
 
-#if !defined(__clang__) && !(defined(_MSC_VER) && (_MSC_VER < 1900))
-#define FOLLY_INTRINSIC_CONSTEXPR constexpr
-#else
-// GCC and MSVC 2015+ are the only compilers with
-// intrinsics constexpr.
+// MSVC does not support intrinsics constexpr
+#if defined(_MSC_VER)
 #define FOLLY_INTRINSIC_CONSTEXPR const
+#else
+#define FOLLY_INTRINSIC_CONSTEXPR constexpr
 #endif
 
 #include <cassert>