[Bug driver/71930] g++ invokes the wrong preprocessor

[noloader at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71930

--- Comment #2 from Jeffrey Walton <noloader at gmail dot com> ---
(In reply to Jakub Jelinek from comment #1)
> What makes you think that this is a bug?

I think its a bug (1) g++ is being used, and (2) -std=c++17 is being used. What
does a file extension have to do with a C++ define, like __cplusplus?