Windows support by Ruben Van Boxem.

llvm-svn: 142235
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 073458b1ab5489dce6f2ec789889c377b690ccf4
diff --git a/include/exception b/include/exception
index f418575..0a747f5 100644
--- a/include/exception
+++ b/include/exception
@@ -80,7 +80,9 @@
 #include <cstddef>
 #include <type_traits>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
+#endif
 
 namespace std  // purposefully not using versioning namespace
 {