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

[redi at gcc dot gnu.org]

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

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #6)
> (In reply to Jonathan Wakely from comment #5)
> > But this is a dup of PR 67023 anyway.
> > 
> > *** This bug has been marked as a duplicate of bug 67023 ***
> 
> Which I've pointed you to before:
> https://gcc.gnu.org/ml/gcc-help/2015-09/msg00081.html

And here when I first created that bug!
https://gcc.gnu.org/ml/gcc-help/2015-07/msg00110.html