[Patch, Fortran] Fix CPP <include_path> (PR 37821)

[Tobias Burnus]

Daniel Franke wrote:
> On Wed, Oct 15, 2008 at 12:24:51AM +0200, Tobias Burnus wrote:
> > There is one harmless problem left: gfortran -I dir  passes the -I twice
> > to f951 for -cpp (but only once for -nocpp). I think it is due to:
>
> How about:
> #define F951_OPTIONS     "%(cc1_options) %{J*} %{!cpp: %{I*}}\

That works for "-cpp" but not for "gfortran file.F90"; I included it
nonetheless. At the moment I don't see an easy method to fix it.
Shall I open a PR? Or shall we simply ignore the double-path warning?

OK for the trunk? (Bootstrapping and regtesting currently under the way.)

Tobias
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