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diff --git a/gcc/rust/parse/rust-cfg-parser.h b/gcc/rust/parse/rust-cfg-parser.h
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+++ b/gcc/rust/parse/rust-cfg-parser.h
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+/* 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 RUST_CFG_PARSER_H
+#define RUST_CFG_PARSER_H
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+
+#include <string>
+
+namespace Rust {
+/**
+ * Parse a `key` or `key="value"` pair given to the `-frust-cfg` compiler
+ * option.
+ *
+ * The format is as follows:
+ *
+ * -frust-cfg=<input>
+ *
+ * cfg_input: identifier | identifier '=' '"' identifier '"'
+ *
+ * @param input User input given to the -frust-cfg option
+ * @param key String in which to store the parsed `key`.
+ * @param value String in which to store the parsed `value` if it exists
+ *
+ * @return false if the given input was invalid, true otherwise
+ */
+bool
+parse_cfg_option (const std::string &input, std::string &key,
+		  std::string &value);
+} // namespace Rust
+
+#if CHECKING_P
+
+namespace selftest {
+extern void
+rust_cfg_parser_test (void);
+} // namespace selftest
+
+#endif // CHECKING_P
+
+#endif // RUST_CFG_PARSER_H