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Re: [Patch, Fortran] PR35203 - reject dummies with VALUE + OPTIONAL

From: Tobias Schlüter <tobias dot schlueter at physik dot uni-muenchen dot de>
To: Tobias Burnus <tobias dot burnus at physik dot fu-berlin dot de>
Cc: gcc-patches at gcc dot gnu dot org, fortran at gcc dot gnu dot org
Date: Wed, 26 Mar 2008 21:43:30 +0100
Subject: Re: [Patch, Fortran] PR35203 - reject dummies with VALUE + OPTIONAL
References: <20080326203912.GA7862@physik.fu-berlin.de>

Tobias Burnus wrote:

Having a dummy which has VALUE and OPTIONAL attribute does not work in
gfortran, but is valid Fortran 9x/200x; to be more precise: One cannot
distinguish an absent argument (argument == NULL) from an argument
of value 0 (argument == 0). Without VALUE this is easy: arg == NULL
vs. *arg == 0.

One has therefore to do the same as for character variables: A hidden
argument needs to be passed.

This patch takes the simple route by simply rejecting such dummies.

OK for the trunk?

Please don't use gfc_error for shortcomings in the compiler. ICEing or gfc_internal_error is much more appropriate for something where the compiler is at fault.

- Tobi

Follow-Ups:
- Re: [Patch, Fortran] PR35203 - reject dummies with VALUE + OPTIONAL
  - From: Richard Guenther

References:
- [Patch, Fortran] PR35203 - reject dummies with VALUE + OPTIONAL
  - From: Tobias Burnus

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