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diff --git a/src/google/protobuf/stubs/port.h b/src/google/protobuf/stubs/port.h
index eb3d8eb3ed9f1..ba155018f39bf 100644
--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -40,18 +40,31 @@
// Legacy: some users reference these (internal-only) macros even though we
// don't need them any more.
-#if defined(_MSC_VER) && defined(PROTOBUF_USE_DLLS)
- #ifdef LIBPROTOBUF_EXPORTS
- #define LIBPROTOBUF_EXPORT __declspec(dllexport)
- #else
- #define LIBPROTOBUF_EXPORT __declspec(dllimport)
+#if defined(COMPONENT_BUILD) && defined(PROTOBUF_USE_DLLS)
+ #if defined(_MSC_VER)
+ #ifdef LIBPROTOBUF_EXPORTS
+ #define LIBPROTOBUF_EXPORT __declspec(dllexport)
+ #else
+ #define LIBPROTOBUF_EXPORT __declspec(dllimport)
+ #endif
+ #ifdef LIBPROTOC_EXPORTS
+ #define LIBPROTOC_EXPORT __declspec(dllexport)
+ #else
+ #define LIBPROTOC_EXPORT __declspec(dllimport)
+ #endif
+ #else // defined(_MSC_VER)
+ #ifdef LIBPROTOBUF_EXPORTS
+ #define LIBPROTOBUF_EXPORT __attribute__((visibility("default")))
+ #else
+ #define LIBPROTOBUF_EXPORT
+ #endif
+ #ifdef LIBPROTOC_EXPORTS
+ #define LIBPROTOC_EXPORT __attribute__((visibility("default")))
+ #else
+ #define LIBPROTOC_EXPORT
+ #endif
#endif
- #ifdef LIBPROTOC_EXPORTS
- #define LIBPROTOC_EXPORT __declspec(dllexport)
- #else
- #define LIBPROTOC_EXPORT __declspec(dllimport)
- #endif
-#else
+#else // defined(COMPONENT_BUILD) && defined(PROTOBUF_USE_DLLS)
#define LIBPROTOBUF_EXPORT
#define LIBPROTOC_EXPORT
#endif
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