Re: [Patch, Fortran] PR 40881: warn for obsolescent features

["Manfred Schwarb" <manfred99 at gmx dot ch>]

> 2009/8/2 Manfred Schwarb <manfred99@gmx.ch>:
> > I think this the wrong approach.
> > You should _NOT_ couple these Warnings with -std=legacy.
> 
> Actually this was not my idea. I first discovered that warnings for
> obsolescent features were missing. After that I discovered that some
> of them (like arithmetic if) *do* have warnings, and I just added
> warnings for some others in the same way.
> 
> Seems like I opened a can of worms with this ...
> 
> 
> > As long as a feature is supported by a standard, you should not
> > get warnings with default compiler settings
> 
> You do not get these warnings with default settings, only if you
> specify -std=f95 or -pedantic.
> 

OK, good.

> The reason that I added -std=legacy in the testsuite was that all test
> cases are by default compiled with -pedantic
>

OK. My reaction was caused by the seemingly mechanism
"we get standards warnings -> so we use -std=legacy"
Admittedly for the test-suite this may be ok, perhaps, but otherwise
this seems to be quite a dangerous thing.


> 
> > And if you think you can _ever_ delete these features from gfortran,
> > I think you are mistaken. Gfortran will have to support these
> > features even if they are _deleted_ from the fortran standards.
> 
> Don't worry. I don't want to delete anything. I just want gfortran to
> be a standards-compliant Fortran compiler. So, as long as the Fortran
> standard supports these features, gfortran surely will. Apart from
> that, I don't see how gfortran would *have to* support *anything*.
> 
> 
> > So could you couple these warnings with -Wextra, or even with
> > -Wall, or introduce a new "-std=" category, this would be great.
> 
> These are all viable possibilities. If this is extremely important for
> you, the fastest way to get it done is probably to do it yourself. I
> am personally more concerned about getting F03 implemented than to put
> large amounts of work into compatibility with F77. But, you know, the
> nice thing about gfortran is that everyone is free to contribute ...
> 

Sorry, if there are things one can do without copyright assignment,
I will think about it, otherwise, not.
I regularily test my code base with trunk, though.

Cheers,
Manfred


> Cheers,
> Janus

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