Can't include standard headers in C++ Modules (clang++ v12)

Hi All,

I’m trying to include standard headers like in a C++ module. The C++ Clang v12 compiler can’t see these headers, but they are found in the old style translation units. Can someone explain how to include the standard headers in C++20 module translation units.

Thanks in advance.


+Richard Smith who might have ideas

I’m not sure exactly why they wouldn’t be findable (perhaps it’s obvious to Richard from your description). More specific details might help - clang -cc1 command lines, small/isolated files needed to reproduce, etc.