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diff --git a/gcc/diagnostic-output-spec.h b/gcc/diagnostic-output-spec.h
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+/* Support for the DSL of -fdiagnostics-add-output= and
+   -fdiagnostics-set-output=.
+   Copyright (C) 2024-2025 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_DIAGNOSTIC_OUTPUT_SPEC_H
+#define GCC_DIAGNOSTIC_OUTPUT_SPEC_H
+
+#include "diagnostic-format.h"
+#include "diagnostic-output-file.h"
+
+namespace diagnostics_output_spec {
+
+/* An abstract base class for handling the DSL of -fdiagnostics-add-output=
+   and -fdiagnostics-set-output=.  */
+
+class context
+{
+ public:
+  std::unique_ptr<diagnostic_output_format>
+  parse_and_make_sink (const char *,
+		       diagnostic_context &dc);
+
+  void
+  report_error (const char *gmsgid, ...) const
+    ATTRIBUTE_GCC_DIAG(2,3);
+
+  void
+  report_unknown_key (const char *unparsed_arg,
+		      const std::string &key,
+		      const std::string &scheme_name,
+		      auto_vec<const char *> &known_keys) const;
+
+  void
+  report_missing_key (const char *unparsed_arg,
+		      const std::string &key,
+		      const std::string &scheme_name,
+		      const char *metavar) const;
+
+  diagnostic_output_file
+  open_output_file (label_text &&filename) const;
+
+  const char *
+  get_option_name () const { return m_option_name; }
+
+  line_maps *
+  get_affected_location_mgr () const { return m_affected_location_mgr; }
+
+  virtual ~context () {}
+
+  virtual void
+  report_error_va (const char *gmsgid, va_list *ap) const = 0;
+
+  virtual const char *
+  get_base_filename () const = 0;
+
+protected:
+  context (const char *option_name,
+	   line_maps *affected_location_mgr)
+  : m_option_name (option_name),
+    m_affected_location_mgr (affected_location_mgr)
+  {
+  }
+
+  const char *m_option_name;
+  line_maps *m_affected_location_mgr;
+};
+
+/* A subclass that implements reporting errors via a diagnostic_context.  */
+
+struct gcc_spec_context : public diagnostics_output_spec::context
+{
+public:
+  gcc_spec_context (diagnostic_context &dc,
+		    line_maps *affected_location_mgr,
+		    line_maps *control_location_mgr,
+		    location_t loc,
+		    const char *option_name)
+  : context (option_name, affected_location_mgr),
+    m_dc (dc),
+    m_control_location_mgr (control_location_mgr),
+    m_loc (loc)
+  {}
+
+  void report_error_va (const char *gmsgid, va_list *ap) const final override
+    ATTRIBUTE_GCC_DIAG(2, 0)
+  {
+    m_dc.begin_group ();
+    rich_location richloc (m_control_location_mgr, m_loc);
+    m_dc.diagnostic_impl (&richloc, nullptr, -1, gmsgid, ap, DK_ERROR);
+    m_dc.end_group ();
+  }
+
+  diagnostic_context &m_dc;
+  line_maps *m_control_location_mgr;
+  location_t m_loc;
+};
+
+} // namespace diagnostics_output_spec
+
+#endif