[clang] Support '-fmodule-file-home-is-cwd' for C++ modules. (PR #135147)

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 commented:

Didn't take a close look. But I don't feel we shall do it behind a flag. I think we should make BMI of C++20 modules (at least C++20 named modules) relocatable.

In our downstream, IIUC, we make it by always enabling "-fmodules-embed-all-files " . See discussion here: https://github.com/llvm/llvm-project/issues/72383

Correct me if I didn't understand your problem.

https://github.com/llvm/llvm-project/pull/135147