Re: [patch, fortran] Warn about out-of-bounds access with DO subscripts

[Thomas Koenig <tkoenig@netcologne.de>]

Hi Walter,

> This is a nice warning - thank you for adding it.

Thanks!

> FWIW - in ancient pre-Fortran 77 code it was common for an array dummy 
> argument to have a size of '1', then over-indexed, because the '*' for 
> assumed size arrays was not yet standardized.  E.g. code like:
> 
>    SUBROUTINE SUB (A, B)
>    REAL A(1), B(42,1)
> 
> should almost always be written:
> 
>    SUBROUTINE SUB (A, B)
>    REAL A(*), B(42,*)
> 
> I imagine a few folks blowing the dust off some very old code may be 
> surprised to start getting these warnings.  Obviously their code should 
> have been changed to use '*' 30+ years ago...

If it gives people an incentive to modernize, so much the better.
Using '1' as trailing subscript is also caught with bounds checking
with gfortran, so these people could also not have used that.
We'll see if large numbers of people suddenly start complaining,
but I don't think so :-)

Regards

	Thomas