Ticket #10788: boost-1.57.0-WinXP-SP2-PhysicalConcurrency-Return0.patch

boost_1_57_0/libs/thread/src/win32/thread.cpp

@@ -533 +533 @@
         return hardware_concurrency();
 #else
         unsigned cores = 0;
-#if !(defined(__MINGW32__) || defined (__MINGW64__))
+#if !(defined(__MINGW32__) || defined (__MINGW64__)) && _WIN32_WINNT >= 0x0600
+        // This part of code is only available reliably on Windows Vista and Higher
         DWORD size = 0;
 
         GetLogicalProcessorInformation(NULL, &size);
@@ -550 +551 @@
             if (buffer[i].Relationship == RelationProcessorCore)
                 ++cores;
         }
+#else
 #endif
         return cores;
 #endif