Qt6 migration fixes: RTI DDS alias targets, ErrorMessage namespace, DDS header include path

build-test2/Lts/Plugins/Messaging/Data/msgdataplugin_export.h

@@ -0,0 +1,43 @@
+
+#ifndef MSGDATAPLUGIN_EXPORT_H
+#define MSGDATAPLUGIN_EXPORT_H
+
+#ifdef MSGDATAPLUGIN_STATIC_DEFINE
+#  define MSGDATAPLUGIN_EXPORT
+#  define MSGDATAPLUGIN_NO_EXPORT
+#else
+#  ifndef MSGDATAPLUGIN_EXPORT
+#    ifdef MsgDataPlugin_EXPORTS
+        /* We are building this library */
+#      define MSGDATAPLUGIN_EXPORT __attribute__((visibility("default")))
+#    else
+        /* We are using this library */
+#      define MSGDATAPLUGIN_EXPORT __attribute__((visibility("default")))
+#    endif
+#  endif
+
+#  ifndef MSGDATAPLUGIN_NO_EXPORT
+#    define MSGDATAPLUGIN_NO_EXPORT __attribute__((visibility("hidden")))
+#  endif
+#endif
+
+#ifndef MSGDATAPLUGIN_DEPRECATED
+#  define MSGDATAPLUGIN_DEPRECATED __attribute__ ((__deprecated__))
+#endif
+
+#ifndef MSGDATAPLUGIN_DEPRECATED_EXPORT
+#  define MSGDATAPLUGIN_DEPRECATED_EXPORT MSGDATAPLUGIN_EXPORT MSGDATAPLUGIN_DEPRECATED
+#endif
+
+#ifndef MSGDATAPLUGIN_DEPRECATED_NO_EXPORT
+#  define MSGDATAPLUGIN_DEPRECATED_NO_EXPORT MSGDATAPLUGIN_NO_EXPORT MSGDATAPLUGIN_DEPRECATED
+#endif
+
+/* NOLINTNEXTLINE(readability-avoid-unconditional-preprocessor-if) */
+#if 0 /* DEFINE_NO_DEPRECATED */
+#  ifndef MSGDATAPLUGIN_NO_DEPRECATED
+#    define MSGDATAPLUGIN_NO_DEPRECATED
+#  endif
+#endif
+
+#endif /* MSGDATAPLUGIN_EXPORT_H */