[Bug preprocessor/67551] Preprocessor generates non-ISO line directives

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67551

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Or you could use -fpreprocessed as another option which is the same as doing
.i.