https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81615
--- Comment #2 from Ben Barrowes <barrowes at alum dot mit.edu> --- Then how does one get a preprocessed/savetemp file from an existing *.f90 file? In the case of C, preprocessed and temp files have different extensions and are thus easily identified after compiling. For gfortran, preprocessing/saveingtemps of *.f files produces *.f90 files which is confusing, and preprocessing/savetemps of *.f90 files produces no output. Gfortran needs to produce preprocessed/savetemps that have unique and easily identifiable extensions. If not *.i and *.i90, then something else like *.t and *.t90 or similar.
