| Issue |
61456
|
| Summary |
[C++20] [Modules] default -fmodule-output of partitions is inconsistent with -fprebuilt-module-path
|
| Labels |
|
| Assignees |
|
| Reporter |
huangqinjin
|
### Example
**interface.cppm**
```cxx
export module hello:interface;
export void hello() {}
```
**hello.cppm**
```cxx
export module hello;
export import :interface;
```
**main.cpp**
```cxx
import hello;
int main() { hello(); }
```
### Problem
GCC is able to compile them in single command:
```shell
g++ -std=c++20 -fmodules-ts -x c++ interface.cppm hello.cppm main.cpp -o hello
```
But clang is **not** able to achieve by the command:
```shell
clang++ -std=c++20 -fmodule-output -fprebuilt-module-path=. interface.cppm hello.cppm main.cpp -o hello
```
### Cause
The `-fmodule-output` filename of partition `interface.cppm` is `interface.pcm` by default. (GCC & MSVC are both default to `hello-interface.gcm` / `hello-interface.ifc`). But `-fprebuilt-module-path` requires `hello-interface.pcm`.
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