[Bug fortran/31588] gfortran should be able to output Makefile dependencies with -M* options

["rep dot dot dot nop at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #6 from rep dot dot dot nop at gmail dot com  2007-06-04 20:50 -------
Subject: Re:  gfortran should be able to output Makefile dependencies with -M*
options

On Mon, Jun 04, 2007 at 05:39:48PM -0000, fxcoudert at gcc dot gnu dot org
wrote:
>
>
>------- Comment #5 from fxcoudert at gcc dot gnu dot org  2007-06-04 17:39 -------
>(In reply to comment #4)
>> fx, are you still working on this?
>
>Not actively. It's probably not so hard, though: read the file, like we do with
>-fsyntax-only mode, and parse #file headers.

Yes, without looking i was thinking about for each file, populate a list
of provides/needs mods and emit them when a file is done.

>> yet another reason why "-M" as an alias for -J should be dropped and instead
>> proper -M dependency handling should be added is this:
>> 
>> $ echo end > foo.f90 && gfortran -o main  foo.f90 -v -M
>> Segmentation fault
>
>That's another one. File a new PR (it's probably a simple check that's missing
>in gfc_handle_module_path_options()).

I did not look whether it is calling strlen on NULL or another spot in
the option handling, but i will not look at the current meaning of -M,
so please feel free to file this if you think it's worth noting it.
Thanks,


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31588