Use source_parser type for logging source parser issues

AUTHORS.rst

@@ -112,6 +112,7 @@ Contributors
 * Thomas Waldmann -- apidoc module fixes
 * Till Hoffmann -- doctest option to exit after first failed test
 * Tim Hoffmann -- theme improvements
+* Valentin Heinisch -- warning types improvement
 * Victor Wheeler -- documentation improvements
 * Vince Salvino -- JavaScript search improvements
 * Will Maier -- directory HTML builder

CHANGES.rst

@@ -66,6 +66,9 @@ Features added
   Patch by Adam Turner.
 * #13805: LaTeX: add support for ``fontawesome7`` package.
   Patch by Jean-François B.
+* #13894: Add ``source_parser`` type to :confval:`suppress_warnings` for grouping
+  issues related to the ``c`` and ``cpp`` source parsers.
+  Patch by Valentin H.
 
 Bugs fixed
 ----------

sphinx/util/cfamily.py

@@ -356,7 +356,10 @@ def fail(self, msg: str) -> NoReturn:
         raise self._make_multi_error(errors, '')
 
     def warn(self, msg: str) -> None:
-        logger.warning(msg, location=self.location)
+        subtype = 'c' if self.language == 'C' else 'cpp'
+        logger.warning(
+            msg, location=self.location, type='source_parser', subtype=subtype
+        )
 
     def match(self, regex: re.Pattern[str]) -> bool:
         match = regex.match(self.definition, self.pos)