Erroneous results from gfortran

[Iain Sandoe]

Hello Professor,

Shahrooz, Bahram (shahrobm) via Gcc <gcc@gcc.gnu.org> wrote:

> I’ve used gfortran to compile a program on Mac Big Sur using gcc-10.2 and  
> on Windows 10 using g77.  I’ve used -o0 for both cases.   The results for  
> identical input values are vastly different between the two executables  
> and wrong from gfortran.
>
> I’m not sure if there’s a big in gfortran or something else is causing  
> this issue.

It is impossible to tell from your description.

So far, there is no released version of gfortran that supports the recently  
released macOS 11 (big sur) update, although Intel versions of the platform  
would be expected to be supported from 10.3 onwards.

> I appreciate if you look into this issue.

In order for us to look into the issue we would need to be able to  
reproduce the problem - so some more information is needed - please see:

https://gcc.gnu.org/bugs/

for a description of how to report a bug using

https://gcc.gnu.org/bugzilla/

so that we can try to fix examine and fix it.

thanks.
Iain