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diff --git a/indra/newview/llappviewermacosx-for-objc.h b/indra/newview/llappviewermacosx-for-objc.h
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+++ b/indra/newview/llappviewermacosx-for-objc.h
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+/**
+ * @file   llappviewermacosx-for-objc.h
+ * @author Nat Goodspeed
+ * @date   2018-06-15
+ * @brief  llappviewermacosx.h publishes the C++ API for
+ *         llappviewermacosx.cpp, just as
+ *         llappviewermacosx-objc.h publishes the Objective-C++ API for
+ *         llappviewermacosx-objc.mm.
+ *
+ *         This header is intended to publish for Objective-C++ consumers a
+ *         subset of the C++ API presented by llappviewermacosx.cpp. It's a
+ *         subset because, if an Objective-C++ consumer were to #include
+ *         the full llappviewermacosx.h, we would almost surely run into
+ *         trouble due to the discrepancy between Objective-C++'s BOOL versus
+ *         classic Microsoft/Linden BOOL.
+ * 
+ * $LicenseInfo:firstyear=2018&license=viewerlgpl$
+ * Copyright (c) 2018, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#if ! defined(LL_LLAPPVIEWERMACOSX_FOR_OBJC_H)
+#define LL_LLAPPVIEWERMACOSX_FOR_OBJC_H
+
+#include <string>
+
+void constructViewer();
+bool initViewer();
+void handleUrl(const char* url_utf8);
+bool pumpMainLoop();
+void handleQuit();
+void cleanupViewer();
+void infos(const std::string& message);
+
+// This struct is malleable; it only serves as a way to convey a number of
+// fields from llappviewermacosx.cpp's CrashMetadata_instance() function to the
+// consuming functions in llappdelegate-objc.mm. As long as both those sources
+// are compiled with this same header, the content and order of CrashMetadata
+// can change as needed.
+struct CrashMetadata
+{
+    std::string logFilePathname;
+    std::string userSettingsPathname;
+    std::string staticDebugPathname;
+    std::string OSInfo;
+    std::string agentFullname;
+    std::string regionName;
+    std::string fatalMessage;
+};
+
+CrashMetadata& CrashMetadata_instance();
+
+#endif /* ! defined(LL_LLAPPVIEWERMACOSX_FOR_OBJC_H) */