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diff --git a/gcc/diagnostic-format-html.h b/gcc/diagnostic-format-html.h
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+/* HTML output for diagnostics.
+   Copyright (C) 2024-2025 Free Software Foundation, Inc.
+   Contributed by David Malcolm <dmalcolm@redhat.com>.
+
+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_DIAGNOSTIC_FORMAT_HTML_H
+#define GCC_DIAGNOSTIC_FORMAT_HTML_H
+
+#include "diagnostic-format.h"
+#include "diagnostic-output-file.h"
+
+struct html_generation_options
+{
+  html_generation_options ();
+
+  bool m_css;
+  bool m_javascript;
+
+  // Debugging options:
+
+  // If true, attempt to show state diagrams at events
+  bool m_show_state_diagrams;
+
+  // If true, show the XML form of the state with such diagrams
+  bool m_show_state_diagram_xml;
+
+  // If true, show the .dot source used for the diagram
+  bool m_show_state_diagram_dot_src;
+};
+
+extern diagnostic_output_file
+diagnostic_output_format_open_html_file (diagnostic_context &context,
+					 line_maps *line_maps,
+					 const char *base_file_name);
+
+extern std::unique_ptr<diagnostic_output_format>
+make_html_sink (diagnostic_context &context,
+		const line_maps &line_maps,
+		const html_generation_options &html_gen_opts,
+		diagnostic_output_file output_file);
+
+extern void
+print_path_as_html (xml::printer &xp,
+		    const diagnostic_path &path,
+		    diagnostic_context &dc,
+		    html_label_writer *event_label_writer,
+		    const diagnostic_source_print_policy &dspp);
+
+#endif /* ! GCC_DIAGNOSTIC_FORMAT_HTML_H */