[Bug fortran/81615] save-temps and gfortran produces *.f90 files instead of *.i or *i90 files

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81615

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2017-07-31
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> I was under the impression that I would get a test0.i file since the only
> documentation of using -save-temps I can find comes from the gcc docs:
> https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html#index-save-temps

Which says

 Store the usual “temporary” intermediate files permanently.

> which mentions *.i files in their example.

because the compiled file is a C file. The *.i (*.ii) files are C (C++ files),
thus cannot (shall not) be produced by gfortran.

As noticed in comment 0, -save-temps generates a preprocessed *.f90 if it does
not already exists. Note that INCLUDE statements are ignored.

IMO this PR should be closed as INVALID or WONTFIX.