Visibility.h

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#ifndef VISIBILITY_MACROS_H
#define VISIBILITY_MACROS_H
#include "FWCore/Utilities/interface/GCCPrerequisite.h"

#if GCC_PREREQUISITE(4, 4, 0)
#define dso_export __attribute__((visibility("default")))
#define dso_hidden __attribute__((visibility("hidden")))
#define dso_internal __attribute__((visibility("hidden")))
#define dso_protected __attribute__((visibility("protected")))
#else
#define dso_export
#define dso_hidden
#define dso_internal
#define dso_protected
#endif

#endif  // VISIBILITY