> so I try gfortran -MM x.for, but I got nothing
> even when I use gfortran -M x.for, I got Segmentation fault
In current gfortran, -M is an option that says where module files should
be stored, which explains your first case. There was a bug handling the
case where the user doesn't specify any directory (using "-M" alone)
which you seem to experience, and has been fixed in 4.3.0 IIRC.
> Is there any other method create a dependent file for fortran file?
Not in currently released versions. It is planned for 4.4, as well as a
complete under-the-hood rework of preprocessing (allowing for more
control about the preprocessing style and options).
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FX
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