================
@@ -14,3 +14,11 @@
 
 //--- test.pcm
 // CPP20WARNING-NOT: clang-cl: warning: argument unused during compilation: 
'/std:c++20' [-Wunused-command-line-argument]
+
+// test whether the following outputs %Hello.bmi
+// RUN: %clang_cl /std:c++20 --precompile -x c++-module 
-fmodule-output=%t/Hello.bmi -Fo"%t/Hello.bmi" -c %t/Hello.cppm -### 2>&1 | 
FileCheck %s
----------------
sharadhr wrote:

> This is just one invocation, but the logic in GetNamedOutputPath() seems to 
> cover many cases.

Agreed; once again; open to suggestions for more test cases. 

> Also, is it -fmodule-output or /Fo that sets the output filename (or both?)

>From the [Clang user 
>guide](https://clang.llvm.org/docs/StandardCPlusPlusModules.html#how-to-build-projects-using-modules),
> it appears _both_ are required, and CMake in particular uses the 'one-phase 
>compilation' method.


https://github.com/llvm/llvm-project/pull/121046
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