[Bug fortran/55534] -Wno-missing-include-dirs does not work with gfortran

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55534

--- Comment #10 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Harald Anlauf from comment #9)
> (In reply to Manuel López-Ibáñez from comment #8)
> > (In reply to Manuel López-Ibáñez from comment #7)
> > > The ideal fix for this would adding a function like:
> > 
> > I forgot about this bug and redid the above from scratch. But this time, I
> > actually tested that it works:
> > https://gcc.gnu.org/ml/fortran/2014-10/msg00019.html
> 
> Has this patch been applied?

An equivalent one has. The remaining problem (I think) is that the warning is
given when -I is processed, so the order of -I and -Wno-missing-include-dirs
matters. In your example, the order should be correct, but the driver
unhelpfully re-orders the command-line as:

f951 xxx.f90 -I /no/such/dir -quiet -dumpbase xxx.f90 "-mtune=generic"
"-march=x86-64" -auxbase xxx -Wno-missing-include-dirs -fintrinsic-modules-path
finclude -o /tmp/ccwz8Va5.s

If I invoke f951 manually, it works:

f951 -Wno-missing-include-dirs ~/xxx.f90 -I /no/such/dir
-Wno-missing-include-dirs

However, if I invoke it like this it doesn't work:

f951 -Wno-missing-include-dirs ~/xxx.f90 -I /no/such/dir
-Wno-missing-include-dirs

because prune_options removes duplicated options by keeping the last one.

Thus, the fix is either to buffer the arguments to -I and process them after
all options have been processed or move just the warning code to such a latter
phase. I'm not sure what is simpler.

This is what the C/C++ FE does (see incpath.c add_path, which is called when -I
is processed and c-opts.c register_include_chains, which is called after
options processing and gives the diagnostics).

Note that this applies to all warnings given by add_path_to_list, since ideally
they should be disabled by "--no-warnings" (aka -w), but currently it depends
on the order they are given.
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