fortran aliasing rules

[Tim Prince]

Jack Howarth wrote:
>     Is there any updated documentation on the Fortran aliasing rules
> and their impact in gfortran? The only discussion that I can find on
> fortran aliasing rules with gnu compilers is at...
> 
> http://www.sunsite.ualberta.ca/Documentation/Gnu/gcc-3.0.2/html_node/g77_561.html
> 
> ...which is rather old. Shouldn't the existing gfortran documentation be
> expanded to cover this issue? Also it has never been clear to me if
> gfortran is wired to issue any warnings with regard to aliasing violations
> in fortran code. Thanks in advance for any insights on this.
>          Jack
> 
The advice there looks reasonably valid.  f90 (any implementation, not 
only gfortran) "wires" itself to catch the typical f77 aliasing 
violations only when you use interface block or module features.