From cf1182ee99ee1868550faac091b5f0d8b43e4dd7 Mon Sep 17 00:00:00 2001
From: "Niall Douglas (s [underscore] sourceforge {at} nedprod [dot] com)"
 <spamtrap@nowhere.com>
Date: Wed, 18 Feb 2015 15:19:48 +0000
Subject: [PATCH] Disable physical_concurrency() on Mingw32 alone.

---
 src/win32/thread.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/win32/thread.cpp b/src/win32/thread.cpp
index ded62056..b4d59e13 100644
--- a/src/win32/thread.cpp
+++ b/src/win32/thread.cpp
@@ -529,7 +529,7 @@ namespace boost
 
     unsigned thread::physical_concurrency() BOOST_NOEXCEPT
     {
-#if BOOST_PLAT_WINDOWS_RUNTIME
+#if BOOST_PLAT_WINDOWS_RUNTIME || (defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR))
         return hardware_concurrency();
 #else
         unsigned cores = 0;