================
@@ -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
----------------
zmodem wrote:

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

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

(Nit: you'll want to put `--` before `%t/Hello.cppm`, otherwise it may be 
interpreted as a command-line option e.g. if the path starts with `/Users`.)

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