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Re: [gfortran] Support INTEGER<->LOGICAL conversion as GNU extension
- From: Paul Brook <paul at codesourcery dot com>
- To: fortran at gcc dot gnu dot org
- Cc: Roger Sayle <roger at eyesopen dot com>,gcc-patches at gcc dot gnu dot org
- Date: Sat, 28 May 2005 18:34:43 +0100
- Subject: Re: [gfortran] Support INTEGER<->LOGICAL conversion as GNU extension
- References: <Pine.LNX.firstname.lastname@example.org>
> 2005-05-27 Roger Sayle <email@example.com>
> * intrinsic.c (add_conv): No longer take a "simplify" argument as
> its always gfc_convert_constant, instead take a "standard" argument.
> (add_conversions): Change all existing calls of add_conv to pass
> GFC_STD_F77 as appropriate. Additionally, if we're allowing GNU
> extensions support integer-logical and logical-integer conversions.
> (gfc_convert_type_warn): Warn about use the use of these conversions
> as a extension when appropriate, i.e. with -pedantic.
> * simplify.c (gfc_convert_constant): Add support for integer to
> logical and logical to integer conversions, using gfc_int2log and
> * arith.c (gfc_log2int, gfc_int2log): New functions.
> * arith.h (gfc_log2int, gfc_int2log): Prototype here.
> * gfortran.texi: Document this new GNU extension.
> * gfortran.dg/logint-1.f: New test case.
> * gfortran.dg/logint-2.f: Likewise.
> * gfortran.dg/logint-3.f: Likewise.
I agree with concerns raised about enabling this extension by default.
However we don't currently have a consistent mechanism to handle this. the
GFC_STD_* mechanism gets us most of the way there, but not quite.
I don't think it's reasonable to expect you to fix that before applying this
If you do apply the patch please add a comment in gfc_convert_type_warn saying
this is an arcane extension that probably shouldn't be accepted without
warning by default.
I think the way forward is to split GFC_STD_GNU into two sub-categories. The
first for extensions that are "nice" and enabled by default. The second for
really crufty extensions (like -fugly-logint and real loop variables) that
want to issue a diagnostic about by default.