From 56e2d451f4221e3012943174fe6f6f0f73e72326 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Wed, 18 May 2016 09:35:32 +0000
Subject: [PATCH] MSVC: add /D_USE_MATH_DEFINES.

Turns out M_PI and friends aren't from the C standard, but rather
they are a POSIX extension. This definition is necessary to enable
them on MSVC.
---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fcfc96b..7a11806 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,8 +41,9 @@ if(WIN32)
         -DWIN32
         -DWIN32_LEAN_AND_MEAN
         -DUNICODE
+        -D_UNICODE
         -DNOMINMAX
-        -D_UNICODE)
+        -D_USE_MATH_DEFINES)
 endif()
 
 if(MSVC)