Add back GTest & GMock's msvc disable warnings and IWYU pragma exports

Reviewed By: Gownta

Differential Revision: D68602524

fbshipit-source-id: bd8c35d235e4a28e023ca0248c5c337525199f74

Author: skrueger

folly/portability/GMock.h

@@ -16,4 +16,14 @@
 
 #pragma once
 
+#include <folly/Portability.h>
+
+// Disable a couple of warnings due to GMock exporting classes
+// that derive from stdlib classes which aren't explicitly exported.
+FOLLY_PUSH_WARNING
+FOLLY_MSVC_DISABLE_WARNING(4251)
+FOLLY_MSVC_DISABLE_WARNING(4275)
+// IWYU pragma: begin_exports
 #include <gmock/gmock.h>
+// IWYU pragma: end_exports
+FOLLY_POP_WARNING

folly/portability/GTest.h

@@ -16,4 +16,14 @@
 
 #pragma once
 
+#include <folly/Portability.h>
+
+// Disable a couple of warnings due to GTest exporting classes
+// that derive from stdlib classes which aren't explicitly exported.
+FOLLY_PUSH_WARNING
+FOLLY_MSVC_DISABLE_WARNING(4251)
+FOLLY_MSVC_DISABLE_WARNING(4275)
+// IWYU pragma: begin_exports
 #include <gtest/gtest.h>
+// IWYU pragma: end_exports
+FOLLY_POP_WARNING