================
@@ -31,6 +31,16 @@ option:
 
   $ clang -cc1 -include-pch test.h.pch test.c -o test.s
 
+To ignore PCH options, use the option `-ignore-pch`:
+
+.. code-block:: bash
+
+  $ clang -cc1 test.h -emit-pch -ignore-pch -o test.h.pch
+  $ clang -cc1 -include-pch test.h.pch -ignore-pch test.c -o test.s
+
+This option disables precompiled headers, overrides -emit-pch and -include-pch.
+test.h.pch is not generated and not used as a prefix header.
+
----------------
MaggieYingYi wrote:

Thanks, fixed in the commit 
https://github.com/MaggieYingYi/llvm-project/commit/8dff812d140fefcda2ff9eb0cbd4aa5b323d7643


https://github.com/llvm/llvm-project/pull/142409
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