Removed raw references to __sun__, __FreeBSD__, __GLIBC__ and __linux__; now just check to see if they are defined.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@177310 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/thread.cpp b/src/thread.cpp
index 1acb131..7a06b29 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -14,7 +14,7 @@
#include "limits"
#include <sys/types.h>
#if !defined(_WIN32)
-#if !__sun__ && !__linux__
+#if !defined(__sun__) && !defined(__linux__)
#include <sys/sysctl.h>
#else
#include <unistd.h>