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diff --git a/gcc/diagnostics/diagnostic-info.h b/gcc/diagnostics/diagnostic-info.h
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+/* Various declarations for language-independent diagnostics subroutines.
+   Copyright (C) 2000-2025 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_DIAGNOSTICS_DIAGNOSTIC_INFO_H
+#define GCC_DIAGNOSTICS_DIAGNOSTIC_INFO_H
+
+namespace diagnostics {
+
+class metadata;
+
+/* A diagnostic is described by the MESSAGE to send, the FILE and LINE of
+   its context and its KIND (ice, error, warning, note, ...)  See complete
+   list in diagnostics/kinds.def.  */
+
+struct diagnostic_info
+{
+  diagnostic_info ()
+  : m_message (),
+    m_richloc (),
+    m_metadata (),
+    m_x_data (),
+    m_kind (),
+    m_option_id (),
+    m_iinfo ()
+  { }
+
+  /* Text to be formatted.  */
+  text_info m_message;
+
+  /* The location at which the diagnostic is to be reported.  */
+  rich_location *m_richloc;
+
+  /* An optional bundle of metadata associated with the diagnostic
+     (or NULL).  */
+  const metadata *m_metadata;
+
+  /* Auxiliary data for client.  */
+  void *m_x_data;
+  /* The kind of diagnostic it is about.  */
+  kind m_kind;
+  /* Which OPT_* directly controls this diagnostic.  */
+  option_id m_option_id;
+
+  /* Inlining context containing locations for each call site along
+     the inlining stack.  */
+  struct inlining_info
+  {
+    /* Locations along the inlining stack.  */
+    auto_vec<location_t, 8> m_ilocs;
+    /* The abstract origin of the location.  */
+    void *m_ao;
+    /* Set if every M_ILOCS element is in a system header.  */
+    bool m_allsyslocs;
+  } m_iinfo;
+};
+
+} // namespace diagnostics
+
+#endif /* ! GCC_DIAGNOSTICS_DIAGNOSTIC_INFO_H */