[Bug preprocessor/65580] Dependency generation has a bug with absent generated include-files in subdirectories

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65580

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I would have expected an error ;)  How can it possibly know which of the
default search paths for includes it should use?