Generate list of module dependencies

[Wilhelm Meier <wilhelm.meier@xxxxxxxx>]

Hi all,

how do I generate a list of imported modules?

I tried

/usr/local/bin/g++ -c -MMD -std=c++23 -fconcepts -fmodules-ts test400.cc

But this errors if for the imported modules no gcm files exist. So this 
doesn't help because I need this list of modules the file test400.cc 
imports because I want to generate the gcm files as needed.