From 54fc071d2b0d8d4d23e87b12ecebd4cdc38bed97 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Mon, 7 Sep 2015 00:07:35 +0200
Subject: [PATCH] MSVC 2015 compatibility: NaN is not constexpr.

It probably complains only because one of them (the float one) is
constexpr and the other is not. Whatever.
---
 src/Magnum/Math/Test/ConstantsTest.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Magnum/Math/Test/ConstantsTest.cpp b/src/Magnum/Math/Test/ConstantsTest.cpp
index e68626dd9..98823f9af 100644
--- a/src/Magnum/Math/Test/ConstantsTest.cpp
+++ b/src/Magnum/Math/Test/ConstantsTest.cpp
@@ -78,7 +78,10 @@ template<class T> void ConstantsTest::_constants() {
 }
 
 template<class T> void ConstantsTest::_specials() {
-    constexpr T a = Constants<T>::nan();
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY /* NaN is not constexpr */
+    constexpr
+    #endif
+    T a = Constants<T>::nan();
     CORRADE_VERIFY(std::isnan(a));
     CORRADE_VERIFY(a != a);