sharadhr wrote:
I believe the issue can be distilled further.
On the `main` branch, this command outputs `Hello.bmi`, assuming `Hello.cppm`
exists and has `export module Hello;`:
```
clang.exe --precompile -x c++-module -o Hello.bmi -c Hello.cppm
```
This command does not:
```
clang-cl.exe --precompile -x c++-module -o Hello.bmi -c Hello.cppm
```
This command also does not:
```
clang-cl.exe --precompile -x c++-module /o Hello.bmi -c Hello.cppm
```
And the only lines where the driver behaviour appears to diverge, is the `if`
block in `Driver.cpp`, commented as below:
```cxx
// Output to a user requested destination?
if (AtTopLevel && !isa<DsymutilJobAction>(JA) && !isa<VerifyJobAction>(JA)) {
...
}
```
https://github.com/llvm/llvm-project/pull/121046
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